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WO2022018925A1 - Antenna device, antenna system, and communication terminal device - Google Patents

Antenna device, antenna system, and communication terminal device Download PDF

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Publication number
WO2022018925A1
WO2022018925A1 PCT/JP2021/016932 JP2021016932W WO2022018925A1 WO 2022018925 A1 WO2022018925 A1 WO 2022018925A1 JP 2021016932 W JP2021016932 W JP 2021016932W WO 2022018925 A1 WO2022018925 A1 WO 2022018925A1
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WIPO (PCT)
Prior art keywords
circuit
state
coil
antenna device
radiating element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/016932
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French (fr)
Japanese (ja)
Inventor
真也 立花
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP2022538591A priority Critical patent/JP7176667B2/en
Priority to CN202190000411.4U priority patent/CN219203496U/en
Publication of WO2022018925A1 publication Critical patent/WO2022018925A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure

Definitions

  • the present invention relates to an antenna device having an impedance matching circuit, an antenna system including a plurality of antenna devices, and a communication terminal device including the antenna system.
  • Patent Document 1 discloses a transformer-type matching circuit that performs impedance matching between a feeding circuit and a radiating element. By using such a transformer type matching circuit, impedance matching between the feeding circuit and the radiating element can be achieved over a wide band.
  • the frequency band of 3 GHz to 6 GHz band is regarded as important, and the antenna device applied to the frequency band is added in the terminal.
  • the wireless LAN standard Wi-Fi antenna is also used in a wide band of 5 GHz band.
  • mobile phone terminals are increasingly equipped with a large number of antennas that require antenna isolation due to the expansion of communication bandwidth and the introduction of MIMO (multiple-input and multiple-output).
  • MIMO multiple-input and multiple-output
  • the first antenna device is an antenna device provided with a transformer-type matching circuit as shown in Patent Document 1.
  • the wideband matching characteristic of the matching circuit is damaged, and energy is taken from the second radiating element of the second antenna device to the first radiating element of the first antenna device, so that the second antenna device is used.
  • the second radiating element of the above has a problem that sufficient radiating efficiency cannot be obtained.
  • 22A and 22B are diagrams showing an example of a decrease in the radiation efficiency of the radiating element due to unnecessary coupling between the first antenna device and the second antenna device.
  • the characteristic EA1 shows the radiation efficiency of the second radiating element in the absence of the first antenna device including the transformer type matching circuit
  • the characteristic EA2 shows the characteristic EA2 in which the first radiating element is unnecessaryly coupled to the second radiating element.
  • the radiation efficiency of the second radiation element in the state of being in the state is shown.
  • the broken line in the figure is the center frequency of the frequency band C used by the second antenna device.
  • the characteristic EB1 indicates the radiation efficiency of the third radiating element when the first antenna device is not present
  • the characteristic EB3 is a state in which the third radiating element is unnecessaryly coupled to the first radiating element.
  • the radiation efficiency of the third radiation element is shown.
  • the broken line in the figure is the center frequency of the used frequency band D of the first antenna device.
  • an object of the present invention is to provide an antenna device capable of suppressing interference between adjacent radiating elements, an antenna system suppressing a decrease in radiation efficiency due to interference between adjacent radiating elements, and a communication terminal device including this antenna system. To do.
  • the antenna device as an example of the present disclosure is With the first radiating element A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
  • a first switching circuit connected to the matching circuit and switching the matching circuit between the first state and the second state, Equipped with The matching circuit is A first coil connected between the first feeding circuit and the first radiating element, A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil, Have, In the second state of the first switching circuit, the parallel capacitance of the first coil is larger than that of the first state of the first switching circuit.
  • the antenna device as an example of the present disclosure is With the first radiating element A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
  • a second switching circuit connected to the matching circuit and switching the matching circuit between the third state and the fourth state, Equipped with The matching circuit is A first coil connected between the first feeding circuit and the first radiating element, A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil, Have,
  • the fourth state of the second switching circuit has a larger capacitance between the second coil and the ground than the third state of the second switching circuit.
  • the antenna system as an example of the present disclosure is A first antenna device including a first radiating element that communicates a signal in the first communication frequency band, and A second antenna device including a second radiating element that communicates signals in the second communication frequency band, and Equipped with The first antenna device is A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
  • a first switching circuit connected to the matching circuit and switching the matching circuit between the first state and the second state, Equipped with The matching circuit is A first coil connected between the first feeding circuit and the first radiating element, A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil, Have, In the second state of the first switching circuit, the parallel capacitance of the first coil is larger than that of the first state of the first switching circuit.
  • the antenna system as an example of the present disclosure is A first antenna device including a first radiating element that communicates a signal in the first communication frequency band, and A third antenna device including a third radiating element that communicates signals in the third communication frequency band, and Equipped with The first antenna device is A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
  • a second switching circuit connected to the matching circuit and switching the matching circuit between the third state and the fourth state, Equipped with The matching circuit is A first coil connected between the first feeding circuit and the first radiating element, A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil, Have, The fourth state of the second switching circuit has a larger capacitance between the second coil and the ground than the third state of the second switching circuit.
  • the communication terminal device as an example of the present disclosure includes the antenna system according to (C), a first feeding circuit, and a second feeding circuit connected to a second radiating element.
  • the communication terminal device as an example of the present disclosure includes the antenna system according to (D), a first feeding circuit, and a third feeding circuit connected to a third radiating element.
  • an antenna device capable of suppressing interference with adjacent antenna devices, an antenna system suppressing a decrease in radiation efficiency due to interference between adjacent antenna devices, and a communication terminal device including the antenna system can be obtained.
  • FIG. 1A and 1B are circuit diagrams showing the configuration of the antenna system 501 according to the first embodiment.
  • FIG. 2A is a Smith chart showing the frequency characteristics of the reflection coefficient when the direction of the first radiating element 11 is viewed from the connection portion P1 of the first feeding circuit 10 in the first state shown in FIG. 1A.
  • FIG. 2B is a Smith chart showing the frequency characteristics of the reflection coefficient when the matching circuit 12 is viewed from the connection portion P0 of the first radiation element 11 in the second state shown in FIG. 1B.
  • FIG. 3 is a block diagram of a communication terminal device 601 including a first antenna device 101 and a second antenna device 201.
  • FIG. 4 is a diagram showing the relationship between the state of the first antenna device 101 and the frequency bands used by the first antenna device 101 and the second antenna device 201.
  • FIG. 5 is a circuit diagram showing the configuration of another first antenna device 101 according to the first embodiment.
  • FIG. 6 is a circuit diagram showing the configuration of still another first antenna device 101 according to the first embodiment.
  • FIG. 7 is a perspective view of the matching circuit 12 according to the first embodiment.
  • FIG. 8 is an exploded plan view of the matching circuit 12.
  • 9A and 9B are circuit diagrams of the matching circuit 12.
  • 10A and 10B are circuit diagrams showing the configuration of the antenna system 502 according to the second embodiment.
  • FIG. 11A is a Smith chart showing the frequency characteristics of the reflection coefficient when the direction of the first radiating element 11 is viewed from the connection portion P1 of the first feeding circuit 10 in the third state shown in FIG. 10A.
  • FIG. 11B is a Smith chart showing the frequency characteristics of the reflection coefficient when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11 in the fourth state shown in FIG. 10B.
  • FIG. 12 is a diagram showing the relationship between the state of the first antenna device 102 and the frequency band used by the first antenna device 102 and the third antenna device 302.
  • FIG. 13 is a circuit diagram showing the configuration of another first antenna device 102 according to the second embodiment.
  • FIG. 14 is a circuit diagram showing the configuration of still another first antenna device 102 according to the second embodiment.
  • FIG. 15 is a circuit diagram showing the configuration of the antenna system 503 according to the third embodiment.
  • FIG. 16 is a diagram showing the relationship between the state of the first antenna device 103 and the frequency band used by the first antenna device 103 and the fourth antenna device 403.
  • FIG. 17 is a circuit diagram of another first antenna device 103 according to the third embodiment.
  • FIG. 18 is a circuit diagram of still another first antenna device 103 according to the third embodiment.
  • FIG. 19 is a plan view of the communication terminal device 601 according to the fourth embodiment.
  • FIG. 20 is a cross-sectional view taken along the line XX of the communication terminal device 601 shown in FIG. 21A and 21B are diagrams showing the configurations of the first radiating element 11 and the second radiating element 21 configured by utilizing a part of the frame 50.
  • 22A and 22B are diagrams showing an example of a decrease in the radiation efficiency of the radiating element due to unnecessary coupling between the first antenna device and the second antenna device.
  • 1A and 1B are circuit diagrams showing the configuration of the antenna system 501 according to the first embodiment.
  • the antenna system 501 is composed of a first antenna device 101 and a second antenna device 201.
  • the first antenna device 101 is connected to a matching circuit 12 and a matching circuit 12 that impedance-matches the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11.
  • a first switching circuit 13 for switching the characteristics of the matching circuit 12 and a control circuit for controlling the first switching circuit 13 are provided. This control circuit will be described later.
  • the second antenna device 201 includes a connection portion P2 of the second feeding circuit 20 to the second radiating element 21, and a matching circuit 22 for impedance matching the second radiating element 21 and the second feeding circuit 20.
  • the first antenna device 101 is, for example, an antenna device for cellular
  • the second antenna device 201 is, for example, an antenna device for wireless LAN using a 1.5 GHz band.
  • the communication frequency band using the first antenna device 101 and the communication frequency band using the second antenna device 201 are different but adjacent to each other.
  • the matching circuit 12 of the first antenna device 101 is located between the first coil L1 connected between the connection portion P1 of the first feeding circuit 10 and the first radiating element 11 and between the first radiating element 11 and the ground. It has a second coil L2, which is connected and magnetically coupled to the first coil L1. The first coil L1 and the second coil L2 form an autotransformer circuit.
  • the first switching circuit 13 has, for example, a first capacitor C1 and a first switch SW1.
  • the off state of the first switch SW1 corresponds to the first state in which the first capacitor C1 is not connected to the first coil L1.
  • the ON state of the first switch SW1 corresponds to the second state in which the first capacitor C1 is connected in parallel to the first coil L1. That is, FIG. 1A represents the "first state” and FIG. 1B represents the "second state”. Further, it can be said that the second state of the first switching circuit 13 has a larger capacitance connected in parallel to the first coil L1 than the first state of the first switching circuit 13.
  • a variable reactance element, a pin diode, or the like may be used.
  • FIG. 2A is a Smith chart showing the frequency characteristics of the reflection coefficient when the direction of the first radiating element 11 is viewed from the connection portion P1 of the first feeding circuit 10 in the first state shown in FIG. 1A.
  • FIG. 2B is a Smith chart showing the frequency characteristics of the reflection coefficient when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11 in the second state shown in FIG. 1B.
  • the first radiating element 11 matches the impedance of the first feeding circuit 10 of 50 ⁇ over a predetermined frequency band centering on the frequency indicated by the marker M01.
  • the impedance is the impedance indicated by the marker M02 at a frequency of 1.54 GHz.
  • the impedance when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11 is 394.0-j63.8 [ ⁇ ]
  • the actual portion is the impedance (50 ⁇ ) of the first feeding circuit 10. It is more than 5 times.
  • This frequency is the parallel resonance frequency of the first coil L1 and the first capacitor C1. That is, the impedance when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11 is substantially open, and when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11, the second coil L2 is used. Only will be visible.
  • a state of 5 times or more the impedance of the first feeding circuit 10 is expressed as "substantially open”.
  • the first radiating element 11 of the first antenna device 101 looks substantially open when viewed from the second radiating element 21 of the second antenna device 201, so that the second antenna device 201 The second radiating element 21 receives almost no interference from the first radiating element 11 of the first antenna device 101.
  • FIG. 3 is a block diagram of a communication terminal device 601 including a first antenna device 101 and a second antenna device 201.
  • the communication terminal device 601 is, for example, a smartphone or a mobile phone terminal, and includes a first antenna device 101, a second antenna device 201, RF modules 71, 72, transmission circuits 61, 62, reception circuits 81, 82, and a baseband circuit 70. I have.
  • the antenna device 101 includes the matching circuit 12 and the first radiating element 11.
  • the RF module 71 is a circuit for mutual communication between a transmission signal and a reception signal of a cellular signal.
  • the transmission circuit 61 is a cellular transmission circuit
  • the receiving circuit 81 is a cellular receiving circuit.
  • the RF module 72 is a circuit for mutual communication between a transmission signal and a reception signal of a wireless LAN signal.
  • the transmission circuit 62 is a transmission circuit for wireless LAN
  • the reception circuit 82 is a reception circuit for wireless LAN.
  • the baseband circuit 70 outputs the transmission signal to the transmission circuits 61 and 62, and inputs the power reception signal from the reception circuits 81 and 82. Further, the baseband circuit 70 controls the first antenna device 101 and the second antenna device 201. In particular, on / off control of the first switch SW1 in the first switching circuit 13 in the first antenna device 101 is performed. That is, the first switch SW1 is turned off when performing cellular communication, and the first switch SW1 is turned on when performing wireless LAN communication.
  • the above-mentioned "control circuit” is a part of the baseband circuit 70.
  • FIG. 4 is a diagram showing the relationship between the state of the first antenna device 101 and the frequency bands used by the first antenna device 101 and the second antenna device 201.
  • the frequency band for communication using the first antenna device 101 is the frequency band A
  • the frequency band for communication using the second antenna device 201 is the frequency band C.
  • the high-low relationship of each frequency band is frequency band C ⁇ frequency band A.
  • the first state is set when the first switch SW1 is off.
  • the second state is set when the first switch SW1 is on.
  • the second antenna device 201 is maintained at a high radiation efficiency of the second radiating element 21 with almost no interference from the first antenna device 101, and wireless LAN communication is performed in the frequency band C.
  • FIG. 5 is a circuit diagram showing the configuration of another first antenna device 101 according to the first embodiment.
  • the first antenna device 101 is a matching circuit 12 and a matching circuit 12 that impedance-matches the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11. It includes a first switching circuit 13 that is connected to switch the characteristics of the matching circuit 12, and a control circuit that controls the matching circuit 12.
  • the configuration of the first switching circuit 13 is different from that of the antenna device 101 shown in FIGS. 1A and 1B.
  • the first switching circuit 13 has a first capacitor C1 and a first switch SW1, but in the example shown in FIG. 5, the first capacitor C1 is composed of the stray capacitance of the first switch SW1.
  • the first capacitor C1 may be configured by the stray capacitance of the first switch SW1. Further, the first capacitor C1 may be configured by a parallel connection circuit of a capacitor as a substantive element as shown in FIGS. 1A and 1B and a stray capacitance shown in FIG. That is, the first capacitor C1 may include the stray capacitance of the first switch SW1.
  • FIG. 6 is a circuit diagram showing the configuration of still another first antenna device 101 according to the first embodiment.
  • the configuration of the first switching circuit 13 is different from that of the antenna device 101 shown in FIGS. 1A and 1B.
  • the first switching circuit 13 has a first switch SW1 connected in series to the first capacitor C1 and the first capacitor C1, but in the example shown in FIG. 6, the first switch is on the connection portion P1 side of the first feeding circuit 10.
  • a SW1 is provided, and a first capacitor C1 is provided on the side of the first radiation element 11.
  • the connection order of the first switch SW1 and the first capacitor C1 may be either.
  • FIG. 7 is a perspective view of the matching circuit 12 according to the first embodiment.
  • the matching circuit 12 is an element formed in a rectangular parallelepiped-shaped laminated body, which is a laminated body of the base material layers S1 to S14 shown later, and has a first input / output terminal T1 and a second input / output terminal T2. It is equipped with a ground terminal GND.
  • the terminal NC in FIG. 1 is an empty terminal.
  • FIG. 8 is an exploded plan view of the matching circuit 12.
  • the matching circuit 12 includes a first coil L11, a second first coil L21, a first second coil L12, and a second second coil L22.
  • the first first coil L11 includes conductor patterns P11 and P12 formed in the base material layers S2 and S3 and connected in series.
  • the first second coil L12 includes conductor patterns P13, P14, P15, P16 formed in the substrate layers S4, S5, S6, S7 and connected in series.
  • the second first coil L21 includes conductor patterns P21 and P22 formed in the substrate layers S13 and S12 and connected in series.
  • the second second coil L22 includes conductor patterns P23, P24, P25, P26 formed in the substrate layers S11, S10, S9, S8 and connected in series.
  • the configuration of the first coil L21 by the conductor patterns P21 and P22 is the same as the configuration of the first coil L11 by the conductor patterns P11 and P12. Further, the configuration of the second coil L22 by the conductor patterns P23, P24, P25, P26 is the same as the configuration of the second coil L12 by the conductor patterns P13, P14, P15, P16.
  • the first end E11 of the first coil L11 is connected to the first input / output terminal T1, and the second end E12 is connected to the second input / output terminal T2.
  • the third end E13 of the second coil L12 is connected to the ground terminal GND, and the fourth end E14 of the second coil L12 is connected to the second input / output terminal T2.
  • the first end E21 of the first coil L21 is connected to the first input / output terminal T1
  • the second end E22 is connected to the second input / output terminal T2.
  • the third end E23 of the second coil L22 is connected to the ground terminal GND, and the fourth end E24 of the second coil L22 is connected to the second input / output terminal T2.
  • the broken line in FIG. 8 shows the connection relationship by the interlayer connection conductor.
  • FIG. 9A and 9B are circuit diagrams of the matching circuit 12.
  • FIG. 9B is an equivalent circuit diagram of the matching circuit 12.
  • the matching circuit 12 can be represented as shown in FIG. 9B.
  • the matching circuit 12 is composed of an autotransformer circuit composed of the first coil L1 and the second coil L2.
  • the self-inductance of the first coil L1 is the self-inductance of the first coils L11 and L21
  • the self-inductance of the second coil L2 is the self-inductance of the second coils L12 and L22.
  • the second embodiment shows an antenna device including a second switch and a second capacitor.
  • the antenna system 502 includes a first antenna device 102 and a third antenna device 302.
  • the first antenna device 102 is connected to a matching circuit 12 and a matching circuit 12 that impedance-matches the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11.
  • a second switching circuit 14 for switching the characteristics of the matching circuit 12 and a control circuit for controlling the second switching circuit 14 are provided.
  • the third antenna device 302 includes a connection portion P3 of the third feeding circuit 30 to the third radiating element 31, and a matching circuit 32 that impedance-matches the third radiating element 31 and the third feeding circuit 30.
  • the first antenna device 102 is, for example, an antenna device for cellular
  • the third antenna device 302 is, for example, an antenna device for cellular using a 4 GHz band.
  • the communication frequency band using the first antenna device 102 and the communication frequency band using the third antenna device 302 are different but adjacent to each other.
  • the matching circuit 12 of the first antenna device 102 is located between the first coil L1 connected between the connection portion P1 of the first feeding circuit 10 and the first radiating element 11 and between the first radiating element 11 and the ground. It has a second coil L2, which is connected and magnetically coupled to the first coil L1. The first coil L1 and the second coil L2 form an autotransformer circuit.
  • the second switching circuit 14 has, for example, a second switch SW2 selectively connected to the second capacitor C2 and the second capacitor C2.
  • the fourth state of the second switching circuit 14 has a larger capacitance between the second coil L2 and the ground than the third state of the second switching circuit 14.
  • an example in which the second switching circuit 14 has the second capacitor C2 and the second switch SW2 is shown, but the present invention is not limited to this, and a variable reactance element, a pin diode, or the like may be used.
  • the state in which the second switch SW2 selects the ground corresponds to the “third state”, and as shown in FIG. 10B, the second switch SW2 selects the second capacitor C2. The state corresponds to the "fourth state”.
  • FIG. 11A is a Smith chart showing the frequency characteristics of the reflection coefficient when the direction of the first radiating element 11 is viewed from the connection portion P1 of the first feeding circuit 10 in the third state shown in FIG. 10A.
  • FIG. 11B is a Smith chart showing the frequency characteristics of the reflection coefficient when the matching circuit 12 is viewed from the connection portion P0 of the first radiation element 11 in the fourth state shown in FIG. 10B.
  • the first radiating element 11 matches the impedance of the first feeding circuit 10 of 50 ⁇ over a predetermined frequency band centered on the frequency indicated by the marker M03.
  • the impedance is the impedance indicated by the marker M04 at a frequency of 4.06 GHz.
  • the impedance when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiating element 11 is 3.9-j51.8 [ ⁇ ]
  • the actual portion is the impedance (50 ⁇ ) of the first feeding circuit 10. It is 1/5 times or less of.
  • This frequency is the series resonance frequency of the second coil L2 and the second capacitor C2. That is, the impedance when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiating element 11 is substantially short-circuited.
  • a state of 1/5 times or less of the impedance of the first feeding circuit 10 is expressed as "substantially short circuit".
  • the first radiating element 11 of the first antenna device 102 looks substantially short when viewed from the third radiating element 31 of the third antenna device 302.
  • the third radiating element 31 receives almost no interference from the first radiating element 11 of the first antenna device 102.
  • FIG. 12 is a diagram showing the relationship between the state of the first antenna device 102 and the frequency band used by the first antenna device 102 and the third antenna device 302.
  • the frequency band for communication using the first antenna device 102 is the frequency band B
  • the frequency band for communication using the third antenna device 302 is the frequency band D.
  • the high-low relationship of each frequency band is frequency band B ⁇ frequency band D.
  • the second switch SW2 When communicating in the frequency band B using the first antenna device 102, the second switch SW2 is in the third state of selecting the ground. When communication is performed in the frequency band D using the third antenna device 302, the second switch SW2 is in the fourth state of selecting the second capacitor C2. As a result, the third antenna device 302 hardly receives the interference of the first antenna device 102, the radiation efficiency of the third radiation element 31 is maintained high, and communication is performed in the frequency band D.
  • FIG. 13 is a circuit diagram showing the configuration of another first antenna device 102 according to the second embodiment.
  • the first antenna device 102 is provided in a matching circuit 12 and a matching circuit 12 for impedance matching the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11.
  • a second switching circuit 14 that is connected to switch the characteristics of the matching circuit 12 and a control circuit that controls the matching circuit 12 are provided.
  • the configuration of the second switching circuit 14 is different from that of the antenna device 102 shown in FIGS. 10A and 10B.
  • the second switching circuit 14 has a second capacitor C2 and a second switch SW2, but in the example shown in FIG. 13, the second capacitor C2 is composed of the stray capacitance of the second switch SW2.
  • the second capacitor C2 may be configured by the stray capacitance of the second switch SW2. Further, the second capacitor C2 may be configured by a parallel connection circuit of a capacitor as a substantive element as shown in FIGS. 10A and 10B and a stray capacitance shown in FIG. That is, the second capacitor C2 may include the stray capacitance of the second switch SW2.
  • FIG. 14 is a circuit diagram showing the configuration of still another first antenna device 102 according to the second embodiment.
  • the configuration of the second switching circuit 14 is different from that of the antenna device 102 shown in FIGS. 10A and 10B.
  • the second switching circuit 14 has a second capacitor C2 and a second switch SW2, but in the example shown in FIG. 14, the second switch SW2 is provided on the ground side. As described above, the connection order of the second switch SW2 and the second capacitor C2 may be either.
  • a third embodiment shows an antenna device including a first switch, a first capacitor, a second switch, and a second capacitor.
  • FIG. 15 is a circuit diagram showing the configuration of the antenna system 503 according to the third embodiment.
  • the antenna system 503 includes a first antenna device 103 and a fourth antenna device 403.
  • the fourth antenna device 403 includes the configurations of the "second antenna device” and the "third antenna device” according to the present invention.
  • the first antenna device 103 is connected to a matching circuit 12 and a matching circuit 12 that impedance-matches the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11. It is provided with a first switching circuit 13 and a second switching circuit 14 for switching the characteristics of the matching circuit 12, and a control circuit for controlling the first switching circuit 13 and the second switching circuit 14.
  • the fourth antenna device 403 includes a connection portion P4 of the fourth feeding circuit 40 to the fourth radiating element 41, and a matching circuit 42 that impedance-matches the fourth radiating element 41 and the fourth feeding circuit 40.
  • the first antenna device 103 is, for example, an antenna device for cellular
  • the fourth antenna device 403 is, for example, an antenna device for wireless LAN.
  • the communication frequency band using the first antenna device 103 and the communication frequency band using the fourth antenna device 403 are different but adjacent to each other.
  • the configuration of the first switching circuit 13 is as shown in the first embodiment.
  • the configuration of the second switching circuit 14 is as shown in the second embodiment.
  • Other configurations are as shown in the first embodiment and the second embodiment.
  • the first antenna device 103 can take four states depending on the combination of the state of the first switch SW1 and the state of the second switch SW2.
  • FIG. 16 is a diagram showing the relationship between the state of the first antenna device 103 and the frequency band used by the first antenna device 103 and the fourth antenna device 403.
  • the frequency band for communication using the first antenna device 103 is the frequency band A or the frequency band B
  • the frequency band for communication using the fourth antenna device 403 is the frequency band C.
  • the frequency band D is the frequency band D.
  • the high-low relationship of each frequency band is frequency band C ⁇ frequency band A ⁇ frequency band D ⁇ frequency band B.
  • the parallel resonance frequency of the first coil L1 and the first capacitor C1 is in the frequency band C
  • the series resonance frequency of the second coil L2 and the second capacitor C2 is in the frequency band D.
  • the first state is set in which the first switch SW1 is off, and the third state is set in which the second switch SW2 selects the ground.
  • the first switch SW1 is set to the second state in which it is on.
  • the fourth antenna device 403 receives almost no interference from the first antenna device 103, the radiation efficiency of the fourth radiating element 41 is maintained high, and wireless LAN communication is performed in the frequency band C.
  • the second switch SW2 is in the fourth state of selecting the second capacitor C2.
  • the fourth antenna device 403 receives almost no interference from the first antenna device 103, the radiation efficiency of the fourth radiating element 41 is maintained high, and wireless LAN communication is performed in the frequency band D.
  • the second switch SW2 When the first switch SW1 is in the second state of being on, the second switch SW2 may be in the fourth state of selecting the second capacitor C2, or the second switch SW2 may select the second capacitor C2. When there are four states, the first switch SW1 may be turned on to set the second state.
  • FIG. 17 is a circuit diagram of another first antenna device 103 according to the third embodiment.
  • a matching circuit 15 is provided between the connection portion P1 of the first feeding circuit 10 and the matching circuit 12.
  • a matching circuit 16 is provided between the connecting portion P0 of the first radiating element 11 and the matching circuit 12.
  • the configurations of the matching circuit 12, the first switching circuit 13, and the second switching circuit 14 are as shown above.
  • matching circuits 15 and 16 may be provided in addition to the transformer type matching circuit 12.
  • FIG. 18 is a circuit diagram of still another first antenna device 103 according to the third embodiment.
  • an additional circuit is provided in the first switching circuit 13 and the second switching circuit 14.
  • a switching circuit 13 by a first capacitor C1, an inductor L3, and a first switch SW1 is connected between the first input / output terminal T1 and the second input / output terminal T2 of the matching circuit 12.
  • a circuit by the second switch SW2, the second capacitor C2 and the inductor L4 is connected between the ground terminal GND of the matching circuit 12 and the ground. Therefore, various frequency dependences can be imparted to the matching characteristics of the matching circuit 12 by selecting the first switch SW1 or the second switch SW2.
  • FIG. 19 is a plan view of the communication terminal device 601 according to the fourth embodiment. However, it represents a state in which the upper half of the housing 600 is removed.
  • the communication terminal device 601 includes a circuit board 60 and a housing 600 containing the circuit board 60.
  • the housing 600 has a conductive frame 50.
  • the antenna device 101 is composed of a part of the frame 50 and a part of the circuit board 60.
  • the circuit board 60 is configured with a power supply circuit shown later.
  • FIG. 20 is a cross-sectional view taken along the line XX of the communication terminal device 601 shown in FIG.
  • a ground conductor 60G is formed on the upper surface of the circuit board 60.
  • the ground conductor 60G is electrically connected to the conductor portion of the housing 600.
  • the circuit board 60 is a multilayer board, the illustration of the internal layer is omitted in FIG. 20.
  • 21A and 21B are diagrams showing the configurations of the first radiating element 11 and the second radiating element 21 configured by using a part of the frame 50.
  • the first radiating element 11 constitutes a loop antenna
  • the second radiating element 21 constitutes a T-branch type antenna.
  • the first radiating element 11 forms a loop together with the ground conductor 60G of the circuit board 60.
  • the ground conductor 60G of the circuit board 60 close to the second radiating element 21 acts as an image forming conductor.
  • the first radiating element 11 constitutes an inverted F-shaped antenna
  • the second radiating element 21 constitutes an inverted L-shaped antenna.
  • the ground conductor 60G of the circuit board 60 close to the first radiating element 11 acts as an image forming conductor.
  • the ground conductor 60G of the circuit board 60 close to the second radiating element 21 acts as an image forming conductor.
  • an antenna system in which interference between a first antenna device having a first radiating element 11 and a second antenna device having a second radiating element 21 is suppressed, and a communication terminal device including this antenna system are provided. can get.
  • the first antenna device 101 is used for cellular communication and the second antenna device 201 is used for wireless LAN, but the first antenna device and the first antenna device are other than the first antenna device and the first antenna device.
  • the present invention can also be applied when the second antenna device or the like is used for the same communication system (for example, cellular communication).
  • a loop antenna As an example of the first radiating element 11 or the second radiating element 21, a loop antenna, a T-branched antenna, an inverted L-shaped antenna, an inverted F-shaped antenna, and the like are exemplified. , Monopole, dipole antenna, etc. can be used.
  • the present invention can be applied even if the height relationship is reversed.
  • Connection part of the fourth power supply circuit 40 P11, P12, P13, P14, P15, P16 ... Conductor patterns P21, P22, P23, P24, P25, P26 ... Conductor patterns S1 to S14 ... Substrate layer SW1 ... First switch SW2 ... Second switch T1 ... First input / output terminal T2 ... Second input / output terminal 10 ... First power supply circuit 11 ... First radiation Element 12 ... Matching circuit 13 ... First switching circuit 14 ... Second switching circuits 15, 16 ... Matching circuit 20 ... Second feeding circuit 21 ... Second radiation element 22 ... Matching circuit 30 ... Third feeding circuit 31 ... Third radiation Element 32 ... Matching circuit 40 ... Fourth power supply circuit 41 ... Fourth radiation element 42 ...
  • Matching circuit 50 ... Frame 60 ... Circuit board 60G ... Ground conductor 61, 62 ... Transmission circuit 70 ... Base band circuit 71, 72 ... RF module 81 , 82 ... Receiving circuits 101 to 103 ... First antenna device 201 ... Second antenna device 302 ... Third antenna device 403 ... Fourth antenna device 501 to 503 ... Antenna system 600 ... Housing 601 ... Communication terminal device

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Abstract

In the present invention, a first antenna device is provided with: a first radiation element; a connection part of a first power feeding circuit, a matching circuit for performing impedance matching; and a first switching circuit that switches between characteristics of the matching circuit. The matching circuit has: a first coil that is connected between the first radiation element and the connection part of the first power feeding circuit; and a second coil that is connected between the first radiation element and the ground and that performs magnetic field coupling with respect to the first coil. The first switching circuit has a first capacitor and a first switch. The first switching circuit switches between a first state where the first capacitor is not connected to the first coil and a second state where the first capacitor is connected in parallel to the first coil.

Description

アンテナ装置、アンテナシステム及び通信端末装置Antenna device, antenna system and communication terminal device

　本発明は、インピーダンス整合回路を有するアンテナ装置、複数のアンテナ装置を備えるアンテナシステム、及びそのアンテナシステムを備える通信端末装置に関する。 The present invention relates to an antenna device having an impedance matching circuit, an antenna system including a plurality of antenna devices, and a communication terminal device including the antenna system.

　給電回路と放射素子とのインピーダンス整合を行う、トランス型の整合回路が特許文献１に開示されている。このようなトランス型の整合回路を用いれば、広帯域に亘って、給電回路と放射素子とのインピーダンス整合をとることができる。 Patent Document 1 discloses a transformer-type matching circuit that performs impedance matching between a feeding circuit and a radiating element. By using such a transformer type matching circuit, impedance matching between the feeding circuit and the radiating element can be achieved over a wide band.

特許第６０４８５９３号公報Japanese Patent No. 6048593

　携帯電話端末の通信用に、昨今は第五世代移動通信システム用の帯域幅の広いシステムが採用されている。その中でも３ＧＨｚ～６ＧＨｚ帯の周波数帯域が重要視され、その周波数帯に適用されるアンテナ装置が端末内に追加されるようになっている。 Recently, a wide bandwidth system for the 5th generation mobile communication system has been adopted for the communication of mobile phone terminals. Among them, the frequency band of 3 GHz to 6 GHz band is regarded as important, and the antenna device applied to the frequency band is added in the terminal.

　一方、無線ＬＡＮ規格のＷｉ－Ｆｉ用のアンテナも同様に５ＧＨｚ帯の広い帯域で使用される。 On the other hand, the wireless LAN standard Wi-Fi antenna is also used in a wide band of 5 GHz band.

　また、携帯電話端末において、通信帯域幅の拡大と共に、ＭＩＭＯ（multiple-input and multiple-output）の導入などにより、アンテナアイソレーションの必要な多数のアンテナを備える状況が増えてきている。 In addition, mobile phone terminals are increasingly equipped with a large number of antennas that require antenna isolation due to the expansion of communication bandwidth and the introduction of MIMO (multiple-input and multiple-output).

　ところが、第１のアンテナ装置の放射素子と第２のアンテナ装置の放射素子とが隣接する状況で、第１のアンテナ装置が、特許文献１に示されるようなトランス型の整合回路を備えるアンテナ装置である場合、その整合回路による広帯域整合特性が災いして、第２のアンテナ装置の第２放射素子から第１のアンテナ装置の第１放射素子にエネルギーがとられてしまい、第２のアンテナ装置の第２放射素子は充分な放射効率が得られない、という問題が発生する。 However, in a situation where the radiating element of the first antenna device and the radiating element of the second antenna device are adjacent to each other, the first antenna device is an antenna device provided with a transformer-type matching circuit as shown in Patent Document 1. In this case, the wideband matching characteristic of the matching circuit is damaged, and energy is taken from the second radiating element of the second antenna device to the first radiating element of the first antenna device, so that the second antenna device is used. The second radiating element of the above has a problem that sufficient radiating efficiency cannot be obtained.

　図２２Ａ、図２２Ｂは、上記第１のアンテナ装置と第２のアンテナ装置との不要結合による、放射素子の放射効率の低下の例を示す図である。図２２Ａにおいて、特性ＥＡ１は、トランス型の整合回路を含む第１アンテナ装置が無いときの第２放射素子の放射効率を示し、特性ＥＡ２は、第１放射素子が第２放射素子と不要結合している状態での第２放射素子の放射効率を示す。図中の破線は第２アンテナ装置の使用周波数帯域Ｃの中心周波数である。 22A and 22B are diagrams showing an example of a decrease in the radiation efficiency of the radiating element due to unnecessary coupling between the first antenna device and the second antenna device. In FIG. 22A, the characteristic EA1 shows the radiation efficiency of the second radiating element in the absence of the first antenna device including the transformer type matching circuit, and the characteristic EA2 shows the characteristic EA2 in which the first radiating element is unnecessaryly coupled to the second radiating element. The radiation efficiency of the second radiation element in the state of being in the state is shown. The broken line in the figure is the center frequency of the frequency band C used by the second antenna device.

　また、図２２Ｂにおいて、特性ＥＢ１は、第１アンテナ装置が無いときの第３放射素子の放射効率を示し、特性ＥＢ３は、第３放射素子が第１放射素子と不要結合している状態での第３放射素子の放射効率を示す。図中の破線は第１アンテナ装置の使用周波数帯域Ｄの中心周波数である。 Further, in FIG. 22B, the characteristic EB1 indicates the radiation efficiency of the third radiating element when the first antenna device is not present, and the characteristic EB3 is a state in which the third radiating element is unnecessaryly coupled to the first radiating element. The radiation efficiency of the third radiation element is shown. The broken line in the figure is the center frequency of the used frequency band D of the first antenna device.

　このように、二つの放射素子が隣接する場合に、その干渉により、放射素子の放射効率が低下する。 In this way, when two radiating elements are adjacent to each other, the radiating efficiency of the radiating elements decreases due to the interference.

　そこで、本発明の目的は、隣接する放射素子同士の干渉を抑制できるアンテナ装置、互いに隣接する放射素子の干渉による放射効率の低下を抑制したアンテナシステム、及びこのアンテナシステムを備える通信端末装置を提供することにある。 Therefore, an object of the present invention is to provide an antenna device capable of suppressing interference between adjacent radiating elements, an antenna system suppressing a decrease in radiation efficiency due to interference between adjacent radiating elements, and a communication terminal device including this antenna system. To do.

（Ａ）本開示の一例としてのアンテナ装置は、
　第１放射素子と、
　前記第１放射素子に接続される第１給電回路と前記第１放射素子とをインピーダンス整合させる整合回路と、
　前記整合回路に接続されて当該整合回路を第１状態と第２状態とに切り替える第１切替回路と、
　を備え、
　前記整合回路は、
　　前記第１給電回路と前記第１放射素子との間に接続される第１コイルと、
　　前記第１放射素子とグランドとの間に接続されて、前記第１コイルに対して磁界結合する第２コイルと、
　を有し、
　前記第１切替回路の前記第２状態は、前記第１切替回路の前記第１状態に比べて、前記第１コイルの並列のキャパシタンスが大きい。 (A) The antenna device as an example of the present disclosure is
With the first radiating element
A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
A first switching circuit connected to the matching circuit and switching the matching circuit between the first state and the second state,
Equipped with
The matching circuit is
A first coil connected between the first feeding circuit and the first radiating element,
A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil,
Have,
In the second state of the first switching circuit, the parallel capacitance of the first coil is larger than that of the first state of the first switching circuit.

（Ｂ）本開示の一例としてのアンテナ装置は、
　第１放射素子と、
　前記第１放射素子に接続される第１給電回路と前記第１放射素子とをインピーダンス整合させる整合回路と、
　前記整合回路に接続されて当該整合回路を第３状態と第４状態とに切り替える第２切替回路と、
　を備え、
　前記整合回路は、
　　前記第１給電回路と前記第１放射素子との間に接続される第１コイルと、
　　前記第１放射素子とグランドとの間に接続されて、前記第１コイルに対して磁界結合する第２コイルと、
　を有し、
　前記第２切替回路の前記第４状態は、前記第２切替回路の前記第３状態に比べて、前記第２コイルと前記グランドと間のキャパシタンスが大きい。 (B) The antenna device as an example of the present disclosure is
With the first radiating element
A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
A second switching circuit connected to the matching circuit and switching the matching circuit between the third state and the fourth state,
Equipped with
The matching circuit is
A first coil connected between the first feeding circuit and the first radiating element,
A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil,
Have,
The fourth state of the second switching circuit has a larger capacitance between the second coil and the ground than the third state of the second switching circuit.

（Ｃ）本開示の一例としてのアンテナシステムは、
　第１通信周波数帯の信号を通信する第１放射素子を含む第１アンテナ装置と、
　第２通信周波数帯の信号を通信する第２放射素子を含む第２アンテナ装置と、
　を備え、
　前記第１アンテナ装置は、
　前記第１放射素子に接続される第１給電回路と前記第１放射素子とをインピーダンス整合させる整合回路と、
　前記整合回路に接続されて当該整合回路を第１状態と第２状態とに切り替える第１切替回路と、
　を備え、
　前記整合回路は、
　　前記第１給電回路と前記第１放射素子との間に接続される第１コイルと、
　　前記第１放射素子とグランドとの間に接続されて、前記第１コイルに対して磁界結合する第２コイルと、
　を有し、
　前記第１切替回路の前記第２状態は、前記第１切替回路の前記第１状態に比べて、前記第１コイルの並列のキャパシタンスが大きい。 (C) The antenna system as an example of the present disclosure is
A first antenna device including a first radiating element that communicates a signal in the first communication frequency band, and
A second antenna device including a second radiating element that communicates signals in the second communication frequency band, and
Equipped with
The first antenna device is
A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
A first switching circuit connected to the matching circuit and switching the matching circuit between the first state and the second state,
Equipped with
The matching circuit is
A first coil connected between the first feeding circuit and the first radiating element,
A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil,
Have,
In the second state of the first switching circuit, the parallel capacitance of the first coil is larger than that of the first state of the first switching circuit.

（Ｄ）本開示の一例としてのアンテナシステムは、
　第１通信周波数帯の信号を通信する第１放射素子を含む第１アンテナ装置と、
　第３通信周波数帯の信号を通信する第３放射素子を含む第３アンテナ装置と、
　を備え、
　前記第１アンテナ装置は、
　前記第１放射素子に接続される第１給電回路と前記第１放射素子とをインピーダンス整合させる整合回路と、
　前記整合回路に接続されて当該整合回路を第３状態と第４状態とに切り替える第２切替回路と、
　を備え、
　前記整合回路は、
　　前記第１給電回路と前記第１放射素子との間に接続される第１コイルと、
　　前記第１放射素子とグランドとの間に接続されて、前記第１コイルに対して磁界結合する第２コイルと、
　を有し、
　前記第２切替回路の前記第４状態は、前記第２切替回路の前記第３状態に比べて、前記第２コイルと前記グランドと間のキャパシタンスが大きい。 (D) The antenna system as an example of the present disclosure is
A first antenna device including a first radiating element that communicates a signal in the first communication frequency band, and
A third antenna device including a third radiating element that communicates signals in the third communication frequency band, and
Equipped with
The first antenna device is
A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
A second switching circuit connected to the matching circuit and switching the matching circuit between the third state and the fourth state,
Equipped with
The matching circuit is
A first coil connected between the first feeding circuit and the first radiating element,
A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil,
Have,
The fourth state of the second switching circuit has a larger capacitance between the second coil and the ground than the third state of the second switching circuit.

（Ｅ）本開示の一例としての通信端末装置は、（Ｃ）に記載のアンテナシステムと、第１給電回路と、第２放射素子に接続される第２給電回路とを備える。 (E) The communication terminal device as an example of the present disclosure includes the antenna system according to (C), a first feeding circuit, and a second feeding circuit connected to a second radiating element.

（Ｆ）本開示の一例としての通信端末装置は、（Ｄ）に記載のアンテナシステムと、第１給電回路と、第３放射素子に接続される第３給電回路とを備える。 (F) The communication terminal device as an example of the present disclosure includes the antenna system according to (D), a first feeding circuit, and a third feeding circuit connected to a third radiating element.

　本発明によれば、隣接するアンテナ装置への干渉を抑制できるアンテナ装置、互いに隣接するアンテナ装置の干渉による放射効率の低下を抑制したアンテナシステム、及びそのアンテナシステムを備える通信端末装置が得られる。 According to the present invention, an antenna device capable of suppressing interference with adjacent antenna devices, an antenna system suppressing a decrease in radiation efficiency due to interference between adjacent antenna devices, and a communication terminal device including the antenna system can be obtained.

図１Ａ、図１Ｂは、第１の実施形態に係るアンテナシステム５０１の構成を示す回路図である。1A and 1B are circuit diagrams showing the configuration of the antenna system 501 according to the first embodiment. 図２Ａは、図１Ａに示した第１状態での、第１給電回路１０の接続部Ｐ１から第１放射素子１１方向を視た反射係数の周波数特性を示すスミスチャートである。図２Ｂは、図１Ｂに示した第２状態での、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視た反射係数の周波数特性を示すスミスチャートである。FIG. 2A is a Smith chart showing the frequency characteristics of the reflection coefficient when the direction of the first radiating element 11 is viewed from the connection portion P1 of the first feeding circuit 10 in the first state shown in FIG. 1A. FIG. 2B is a Smith chart showing the frequency characteristics of the reflection coefficient when the matching circuit 12 is viewed from the connection portion P0 of the first radiation element 11 in the second state shown in FIG. 1B. 図３は、第１アンテナ装置１０１と第２アンテナ装置２０１を備える通信端末装置６０１のブロック図である。FIG. 3 is a block diagram of a communication terminal device 601 including a first antenna device 101 and a second antenna device 201. 図４は、第１アンテナ装置１０１の状態と、第１アンテナ装置１０１及び第２アンテナ装置２０１の使用周波数帯域との関係を示す図である。FIG. 4 is a diagram showing the relationship between the state of the first antenna device 101 and the frequency bands used by the first antenna device 101 and the second antenna device 201. 図５は第１の実施形態の別の第１アンテナ装置１０１の構成を示す回路図である。FIG. 5 is a circuit diagram showing the configuration of another first antenna device 101 according to the first embodiment. 図６は第１の実施形態のさらに別の第１アンテナ装置１０１の構成を示す回路図である。FIG. 6 is a circuit diagram showing the configuration of still another first antenna device 101 according to the first embodiment. 図７は第１の実施形態に係る整合回路１２の斜視図である。FIG. 7 is a perspective view of the matching circuit 12 according to the first embodiment. 図８は整合回路１２の分解平面図である。FIG. 8 is an exploded plan view of the matching circuit 12. 図９Ａ、図９Ｂは整合回路１２の回路図である。9A and 9B are circuit diagrams of the matching circuit 12. 図１０Ａ、図１０Ｂは、第２の実施形態に係るアンテナシステム５０２の構成を示す回路図である。10A and 10B are circuit diagrams showing the configuration of the antenna system 502 according to the second embodiment. 図１１Ａは図１０Ａに示した第３状態での、第１給電回路１０の接続部Ｐ１から第１放射素子１１方向を視た反射係数の周波数特性を示すスミスチャートである。図１１Ｂは図１０Ｂに示した第４状態での、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視た反射係数の周波数特性を示すスミスチャートである。FIG. 11A is a Smith chart showing the frequency characteristics of the reflection coefficient when the direction of the first radiating element 11 is viewed from the connection portion P1 of the first feeding circuit 10 in the third state shown in FIG. 10A. FIG. 11B is a Smith chart showing the frequency characteristics of the reflection coefficient when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11 in the fourth state shown in FIG. 10B. 図１２は、第１アンテナ装置１０２の状態と、第１アンテナ装置１０２及び第３アンテナ装置３０２の使用周波数帯域との関係を示す図である。FIG. 12 is a diagram showing the relationship between the state of the first antenna device 102 and the frequency band used by the first antenna device 102 and the third antenna device 302. 図１３は第２の実施形態の別の第１アンテナ装置１０２の構成を示す回路図である。FIG. 13 is a circuit diagram showing the configuration of another first antenna device 102 according to the second embodiment. 図１４は第２の実施形態のさらに別の第１アンテナ装置１０２の構成を示す回路図である。FIG. 14 is a circuit diagram showing the configuration of still another first antenna device 102 according to the second embodiment. 図１５は第３の実施形態に係るアンテナシステム５０３の構成を示す回路図である。FIG. 15 is a circuit diagram showing the configuration of the antenna system 503 according to the third embodiment. 図１６は、第１アンテナ装置１０３の状態と、第１アンテナ装置１０３及び第４アンテナ装置４０３の使用周波数帯域との関係を示す図である。FIG. 16 is a diagram showing the relationship between the state of the first antenna device 103 and the frequency band used by the first antenna device 103 and the fourth antenna device 403. 図１７は第３の実施形態に係る別の第１アンテナ装置１０３の回路図である。FIG. 17 is a circuit diagram of another first antenna device 103 according to the third embodiment. 図１８は、第３の実施形態に係るさらに別の第１アンテナ装置１０３の回路図である。FIG. 18 is a circuit diagram of still another first antenna device 103 according to the third embodiment. 図１９は第４の実施形態の通信端末装置６０１の平面図である。FIG. 19 is a plan view of the communication terminal device 601 according to the fourth embodiment. 図２０は、図１９に示した通信端末装置６０１のＸ－Ｘ部分での断面図である。FIG. 20 is a cross-sectional view taken along the line XX of the communication terminal device 601 shown in FIG. 図２１Ａ、図２１Ｂは、フレーム５０の一部を利用して構成された第１放射素子１１及び第２放射素子２１の構成を示す図である。21A and 21B are diagrams showing the configurations of the first radiating element 11 and the second radiating element 21 configured by utilizing a part of the frame 50. 図２２Ａ、図２２Ｂは、第１のアンテナ装置と第２のアンテナ装置との不要結合による、放射素子の放射効率の低下の例を示す図である。22A and 22B are diagrams showing an example of a decrease in the radiation efficiency of the radiating element due to unnecessary coupling between the first antenna device and the second antenna device.

　以降、図を参照して幾つかの具体的な例を挙げて、本発明を実施するための複数の形態を示す。各図中には同一箇所に同一符号を付している。要点の説明又は理解の容易性を考慮して、実施形態を説明の便宜上、複数の実施形態に分けて示すが、異なる実施形態で示した構成の部分的な置換又は組み合わせは可能である。第２の実施形態以降では第１の実施形態と共通の事柄についての記述を省略し、異なる点についてのみ説明する。特に、同様の構成による同様の作用効果については実施形態毎には逐次言及しない。 Hereinafter, a plurality of embodiments for carrying out the present invention will be shown with reference to the drawings with reference to some specific examples. The same reference numerals are given to the same parts in each figure. Although the embodiments are shown separately in a plurality of embodiments for convenience of explanation in consideration of the explanation of the main points or the ease of understanding, partial replacement or combination of the configurations shown in different embodiments is possible. In the second and subsequent embodiments, the description of matters common to the first embodiment will be omitted, and only the differences will be described. In particular, the same action and effect due to the same configuration will not be mentioned sequentially for each embodiment.

《第１の実施形態》
　図１Ａ、図１Ｂは、第１の実施形態に係るアンテナシステム５０１の構成を示す回路図である。このアンテナシステム５０１は、第１アンテナ装置１０１と第２アンテナ装置２０１とで構成されている。 << First Embodiment >>
1A and 1B are circuit diagrams showing the configuration of the antenna system 501 according to the first embodiment. The antenna system 501 is composed of a first antenna device 101 and a second antenna device 201.

　第１アンテナ装置１０１は、第１放射素子１１に対する第１給電回路１０の接続部Ｐ１と、第１放射素子１１と第１給電回路１０とをインピーダンス整合させる整合回路１２と、整合回路１２に接続されて整合回路１２の特性を切り替える第１切替回路１３と、第１切替回路１３を制御する制御回路と、を備える。この制御回路については後に示す。 The first antenna device 101 is connected to a matching circuit 12 and a matching circuit 12 that impedance-matches the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11. A first switching circuit 13 for switching the characteristics of the matching circuit 12 and a control circuit for controlling the first switching circuit 13 are provided. This control circuit will be described later.

　第２アンテナ装置２０１は、第２放射素子２１に対する第２給電回路２０の接続部Ｐ２と、第２放射素子２１と第２給電回路２０とをインピーダンス整合させる整合回路２２と、を備える。 The second antenna device 201 includes a connection portion P2 of the second feeding circuit 20 to the second radiating element 21, and a matching circuit 22 for impedance matching the second radiating element 21 and the second feeding circuit 20.

　第１アンテナ装置１０１は例えばセルラー用のアンテナ装置であり、第２アンテナ装置２０１は例えば１．５ＧＨｚ帯を用いる無線ＬＡＮ用のアンテナ装置である。第１アンテナ装置１０１を用いる通信周波数帯と第２アンテナ装置２０１を用いる通信周波数帯とは異なるが隣接している。 The first antenna device 101 is, for example, an antenna device for cellular, and the second antenna device 201 is, for example, an antenna device for wireless LAN using a 1.5 GHz band. The communication frequency band using the first antenna device 101 and the communication frequency band using the second antenna device 201 are different but adjacent to each other.

　第１アンテナ装置１０１の整合回路１２は、第１給電回路１０の接続部Ｐ１と第１放射素子１１との間に接続される第１コイルＬ１と、第１放射素子１１とグランドとの間に接続されて、第１コイルＬ１に対して磁界結合する第２コイルＬ２と、を有する。この第１コイルＬ１と第２コイルＬ２とでオートトランス回路が構成されている。 The matching circuit 12 of the first antenna device 101 is located between the first coil L1 connected between the connection portion P1 of the first feeding circuit 10 and the first radiating element 11 and between the first radiating element 11 and the ground. It has a second coil L2, which is connected and magnetically coupled to the first coil L1. The first coil L1 and the second coil L2 form an autotransformer circuit.

　第１切替回路１３は、例えば第１キャパシタＣ１及び第１スイッチＳＷ１を有する。この第１スイッチＳＷ１のオフ状態は、第１キャパシタＣ１が第１コイルＬ１に接続されない第１状態に対応する。また、第１スイッチＳＷ１のオン状態は、第１キャパシタＣ１が第１コイルＬ１に並列接続される第２状態に対応する。つまり、図１Ａは「第１状態」を表していて、図１Ｂは「第２状態」を表している。また、第１切替回路１３の第２状態は、第１切替回路１３の前記第１状態に比べて、第１コイルＬ１に並列接続されるキャパシタンスが大きい、といえる。ここでは、第１切替回路１３が第１キャパシタＣ１及び第１スイッチＳＷ１を有する例を示したが、これに限らず、可変リアクタンス素子やｐｉｎダイオード等を用いてもよい。 The first switching circuit 13 has, for example, a first capacitor C1 and a first switch SW1. The off state of the first switch SW1 corresponds to the first state in which the first capacitor C1 is not connected to the first coil L1. Further, the ON state of the first switch SW1 corresponds to the second state in which the first capacitor C1 is connected in parallel to the first coil L1. That is, FIG. 1A represents the "first state" and FIG. 1B represents the "second state". Further, it can be said that the second state of the first switching circuit 13 has a larger capacitance connected in parallel to the first coil L1 than the first state of the first switching circuit 13. Here, an example in which the first switching circuit 13 has the first capacitor C1 and the first switch SW1 is shown, but the present invention is not limited to this, and a variable reactance element, a pin diode, or the like may be used.

　図２Ａは、図１Ａに示した第１状態での、第１給電回路１０の接続部Ｐ１から第１放射素子１１方向を視た反射係数の周波数特性を示すスミスチャートである。また、図２Ｂは、図１Ｂに示した第２状態での、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視た反射係数の周波数特性を示すスミスチャートである。 FIG. 2A is a Smith chart showing the frequency characteristics of the reflection coefficient when the direction of the first radiating element 11 is viewed from the connection portion P1 of the first feeding circuit 10 in the first state shown in FIG. 1A. Further, FIG. 2B is a Smith chart showing the frequency characteristics of the reflection coefficient when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11 in the second state shown in FIG. 1B.

　第１状態では、図２Ａに表れているように、マーカーＭ０１で示す周波数を中心として所定周波数帯に亘って第１放射素子１１は第１給電回路１０のインピーダンスである５０Ωに整合する。 In the first state, as shown in FIG. 2A, the first radiating element 11 matches the impedance of the first feeding circuit 10 of 50Ω over a predetermined frequency band centering on the frequency indicated by the marker M01.

　第２状態では、図２Ｂに表れているように、周波数１．５４ＧＨｚにおいて、マーカーＭ０２で示すインピーダンスとなる。この例では、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視たインピーダンスは３９４．０－ｊ６３．８［Ω］であり、その実部は、第１給電回路１０のインピーダンス（５０Ω）の５倍以上である。この周波数は第１コイルＬ１と第１キャパシタＣ１との並列共振周波数である。つまり、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視たインピーダンスは実質的にオープンとなり、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視たとき、第２コイルＬ２だけが見えることとなる。本発明においては、第１給電回路１０のインピーダンスの５倍以上の状態を、「実質的にオープン」と表現する。 In the second state, as shown in FIG. 2B, the impedance is the impedance indicated by the marker M02 at a frequency of 1.54 GHz. In this example, the impedance when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11 is 394.0-j63.8 [Ω], and the actual portion is the impedance (50Ω) of the first feeding circuit 10. It is more than 5 times. This frequency is the parallel resonance frequency of the first coil L1 and the first capacitor C1. That is, the impedance when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11 is substantially open, and when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiation element 11, the second coil L2 is used. Only will be visible. In the present invention, a state of 5 times or more the impedance of the first feeding circuit 10 is expressed as "substantially open".

　このように、第２状態では、第２アンテナ装置２０１の第２放射素子２１から見て、第１アンテナ装置１０１の第１放射素子１１は実質的にオープンに見えるので、第２アンテナ装置２０１の第２放射素子２１は第１アンテナ装置１０１の第１放射素子１１の干渉を殆ど受けない。 As described above, in the second state, the first radiating element 11 of the first antenna device 101 looks substantially open when viewed from the second radiating element 21 of the second antenna device 201, so that the second antenna device 201 The second radiating element 21 receives almost no interference from the first radiating element 11 of the first antenna device 101.

　図３は、第１アンテナ装置１０１と第２アンテナ装置２０１とを備える通信端末装置６０１のブロック図である。この通信端末装置６０１は例えばスマートフォンや携帯電話端末であり、第１アンテナ装置１０１、第２アンテナ装置２０１、ＲＦモジュール７１，７２、送信回路６１，６２，受信回路８１，８２及びベースバンド回路７０を備えている。アンテナ装置１０１は上記整合回路１２及び第１放射素子１１を備えている。ＲＦモジュール７１は、セルラー用信号の送信信号と受信信号の相互通信を行う回路である。送信回路６１はセルラー用送信回路であり、受信回路８１はセルラー用受信回路である。また、ＲＦモジュール７２は、無線ＬＡＮ用信号の送信信号と受信信号の相互通信を行う回路である。送信回路６２は無線ＬＡＮ用送信回路であり、受信回路８２は無線ＬＡＮ用受信回路である。 FIG. 3 is a block diagram of a communication terminal device 601 including a first antenna device 101 and a second antenna device 201. The communication terminal device 601 is, for example, a smartphone or a mobile phone terminal, and includes a first antenna device 101, a second antenna device 201, RF modules 71, 72, transmission circuits 61, 62, reception circuits 81, 82, and a baseband circuit 70. I have. The antenna device 101 includes the matching circuit 12 and the first radiating element 11. The RF module 71 is a circuit for mutual communication between a transmission signal and a reception signal of a cellular signal. The transmission circuit 61 is a cellular transmission circuit, and the receiving circuit 81 is a cellular receiving circuit. Further, the RF module 72 is a circuit for mutual communication between a transmission signal and a reception signal of a wireless LAN signal. The transmission circuit 62 is a transmission circuit for wireless LAN, and the reception circuit 82 is a reception circuit for wireless LAN.

　図３においてベースバンド回路７０は送信信号を送信回路６１，６２へ出力し、受信回路８１，８２から受電信号を入力する。また、このベースバンド回路７０は第１アンテナ装置１０１及び第２アンテナ装置２０１に対する制御を行う。特に、第１アンテナ装置１０１内の第１切替回路１３内の第１スイッチＳＷ１のオン／オフ制御を行う。つまり、セルラー通信を行う場合には、第１スイッチＳＷ１をオフし、無線ＬＡＮ通信を行う場合には第１スイッチＳＷ１をオンする。上記「制御回路」はベースバンド回路７０の一部の構成である。 In FIG. 3, the baseband circuit 70 outputs the transmission signal to the transmission circuits 61 and 62, and inputs the power reception signal from the reception circuits 81 and 82. Further, the baseband circuit 70 controls the first antenna device 101 and the second antenna device 201. In particular, on / off control of the first switch SW1 in the first switching circuit 13 in the first antenna device 101 is performed. That is, the first switch SW1 is turned off when performing cellular communication, and the first switch SW1 is turned on when performing wireless LAN communication. The above-mentioned "control circuit" is a part of the baseband circuit 70.

　図４は、上記第１アンテナ装置１０１の状態と、第１アンテナ装置１０１及び第２アンテナ装置２０１の使用周波数帯域との関係を示す図である。 FIG. 4 is a diagram showing the relationship between the state of the first antenna device 101 and the frequency bands used by the first antenna device 101 and the second antenna device 201.

　図４に表れているように、第１アンテナ装置１０１を用いて通信を行う周波数帯は周波数帯域Ａであり、第２アンテナ装置２０１を用いて通信を行う周波数帯は周波数帯域Ｃである。各周波数帯域の高低関係は、周波数帯域Ｃ＜周波数帯域Ａである。 As shown in FIG. 4, the frequency band for communication using the first antenna device 101 is the frequency band A, and the frequency band for communication using the second antenna device 201 is the frequency band C. The high-low relationship of each frequency band is frequency band C <frequency band A.

　第１アンテナ装置１０１を用いて周波数帯域Ａで通信を行う場合、第１スイッチＳＷ１がオフである第１状態とする。第２アンテナ装置２０１を用いて周波数帯域Ｃで通信を行う場合、第１スイッチＳＷ１がオンである第２状態とする。これにより、第２アンテナ装置２０１は第１アンテナ装置１０１の干渉を殆ど受けることなく、第２放射素子２１の放射効率が高く維持されて、周波数帯域Ｃによる無線ＬＡＮの通信が成される。 When communicating in the frequency band A using the first antenna device 101, the first state is set when the first switch SW1 is off. When communication is performed in the frequency band C using the second antenna device 201, the second state is set when the first switch SW1 is on. As a result, the second antenna device 201 is maintained at a high radiation efficiency of the second radiating element 21 with almost no interference from the first antenna device 101, and wireless LAN communication is performed in the frequency band C.

　図５は第１の実施形態の別の第１アンテナ装置１０１の構成を示す回路図である。この第１アンテナ装置１０１は、第１放射素子１１に対する第１給電回路１０の接続部Ｐ１と、第１放射素子１１と第１給電回路１０とをインピーダンス整合させる整合回路１２と、整合回路１２に接続されて整合回路１２の特性を切り替える第１切替回路１３と、整合回路１２を制御する制御回路と、を備える。図１Ａ、図１Ｂに示したアンテナ装置１０１とは、第１切替回路１３の構成が異なる。第１切替回路１３は、第１キャパシタＣ１及び第１スイッチＳＷ１を有するが、図５に示す例では、第１キャパシタＣ１は第１スイッチＳＷ１の浮遊容量で構成されている。 FIG. 5 is a circuit diagram showing the configuration of another first antenna device 101 according to the first embodiment. The first antenna device 101 is a matching circuit 12 and a matching circuit 12 that impedance-matches the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11. It includes a first switching circuit 13 that is connected to switch the characteristics of the matching circuit 12, and a control circuit that controls the matching circuit 12. The configuration of the first switching circuit 13 is different from that of the antenna device 101 shown in FIGS. 1A and 1B. The first switching circuit 13 has a first capacitor C1 and a first switch SW1, but in the example shown in FIG. 5, the first capacitor C1 is composed of the stray capacitance of the first switch SW1.

　図５において、第１スイッチＳＷ１がオフ状態のとき、この第１スイッチＳＷ１の両端間に第１キャパシタＣ１が接続された状態となり、第１スイッチＳＷ１がオン状態のとき、第１切替回路１３が導通状態となって、第１キャパシタＣ１は表れない。 In FIG. 5, when the first switch SW1 is in the off state, the first capacitor C1 is connected between both ends of the first switch SW1, and when the first switch SW1 is in the on state, the first switching circuit 13 is connected. The first capacitor C1 does not appear in the conduction state.

　図５に示すように、第１キャパシタＣ１は第１スイッチＳＷ１の浮遊容量で構成してもよい。また、第１キャパシタＣ１を、図１Ａ、図１Ｂに示したような実体的な素子としてのキャパシタと、図５に示した浮遊容量との並列接続回路で構成してもよい。つまり、第１キャパシタＣ１は第１スイッチＳＷ１の浮遊容量を含んでいてもよい。 As shown in FIG. 5, the first capacitor C1 may be configured by the stray capacitance of the first switch SW1. Further, the first capacitor C1 may be configured by a parallel connection circuit of a capacitor as a substantive element as shown in FIGS. 1A and 1B and a stray capacitance shown in FIG. That is, the first capacitor C1 may include the stray capacitance of the first switch SW1.

　図６は第１の実施形態のさらに別の第１アンテナ装置１０１の構成を示す回路図である。図１Ａ、図１Ｂに示したアンテナ装置１０１とは、第１切替回路１３の構成が異なる。第１切替回路１３は、第１キャパシタＣ１及び第１キャパシタＣ１に直列接続される第１スイッチＳＷ１を有するが、図６に示す例では、第１給電回路１０の接続部Ｐ１側に第１スイッチＳＷ１を設け、第１放射素子１１側に第１キャパシタＣ１を設けている。このように、第１スイッチＳＷ１と第１キャパシタＣ１との接続順序はどちらであってもよい。 FIG. 6 is a circuit diagram showing the configuration of still another first antenna device 101 according to the first embodiment. The configuration of the first switching circuit 13 is different from that of the antenna device 101 shown in FIGS. 1A and 1B. The first switching circuit 13 has a first switch SW1 connected in series to the first capacitor C1 and the first capacitor C1, but in the example shown in FIG. 6, the first switch is on the connection portion P1 side of the first feeding circuit 10. A SW1 is provided, and a first capacitor C1 is provided on the side of the first radiation element 11. As described above, the connection order of the first switch SW1 and the first capacitor C1 may be either.

　次に、整合回路１２の構成について例示する。図７は第１の実施形態に係る整合回路１２の斜視図である。この整合回路１２は、後に示す基材層Ｓ１～Ｓ１４の積層体である、直方体形状の積層体に形成された素子であって、第１入出力端子Ｔ１と、第２入出力端子Ｔ２と、グランド端子ＧＮＤと、を備える。図１中の端子ＮＣは空き端子である。 Next, the configuration of the matching circuit 12 will be illustrated. FIG. 7 is a perspective view of the matching circuit 12 according to the first embodiment. The matching circuit 12 is an element formed in a rectangular parallelepiped-shaped laminated body, which is a laminated body of the base material layers S1 to S14 shown later, and has a first input / output terminal T1 and a second input / output terminal T2. It is equipped with a ground terminal GND. The terminal NC in FIG. 1 is an empty terminal.

　図８は整合回路１２の分解平面図である。整合回路１２は、第１の第１コイルＬ１１、第２の第１コイルＬ２１、第１の第２コイルＬ１２、第２の第２コイルＬ２２を備える。 FIG. 8 is an exploded plan view of the matching circuit 12. The matching circuit 12 includes a first coil L11, a second first coil L21, a first second coil L12, and a second second coil L22.

　第１の第１コイルＬ１１は、基材層Ｓ２，Ｓ３に形成されて直列接続された導体パターンＰ１１，Ｐ１２を含む。第１の第２コイルＬ１２は、基材層Ｓ４，Ｓ５，Ｓ６，Ｓ７に形成されて直列接続された導体パターンＰ１３，Ｐ１４，Ｐ１５，Ｐ１６を含む。同様に、第２の第１コイルＬ２１は、基材層Ｓ１３，Ｓ１２に形成されて直列接続された導体パターンＰ２１，Ｐ２２を含む。第２の第２コイルＬ２２は、基材層Ｓ１１，Ｓ１０，Ｓ９，Ｓ８に形成されて直列接続された導体パターンＰ２３，Ｐ２４，Ｐ２５，Ｐ２６を含む。 The first first coil L11 includes conductor patterns P11 and P12 formed in the base material layers S2 and S3 and connected in series. The first second coil L12 includes conductor patterns P13, P14, P15, P16 formed in the substrate layers S4, S5, S6, S7 and connected in series. Similarly, the second first coil L21 includes conductor patterns P21 and P22 formed in the substrate layers S13 and S12 and connected in series. The second second coil L22 includes conductor patterns P23, P24, P25, P26 formed in the substrate layers S11, S10, S9, S8 and connected in series.

　導体パターンＰ２１，Ｐ２２による第１コイルＬ２１の構成は、導体パターンＰ１１，Ｐ１２による第１コイルＬ１１の構成と同じである。また、導体パターンＰ２３，Ｐ２４，Ｐ２５，Ｐ２６による第２コイルＬ２２の構成は、導体パターンＰ１３，Ｐ１４，Ｐ１５，Ｐ１６による第２コイルＬ１２の構成と同じである。 The configuration of the first coil L21 by the conductor patterns P21 and P22 is the same as the configuration of the first coil L11 by the conductor patterns P11 and P12. Further, the configuration of the second coil L22 by the conductor patterns P23, P24, P25, P26 is the same as the configuration of the second coil L12 by the conductor patterns P13, P14, P15, P16.

　第１コイルＬ１１の第１端Ｅ１１は第１入出力端子Ｔ１に接続されていて、第２端Ｅ１２は第２入出力端子Ｔ２に接続されている。第２コイルＬ１２の第３端Ｅ１３はグランド端子ＧＮＤに接続されていて、第２コイルＬ１２の第４端Ｅ１４は第２入出力端子Ｔ２に接続されている。同様に、第１コイルＬ２１の第１端Ｅ２１は第１入出力端子Ｔ１に接続されていて、第２端Ｅ２２は第２入出力端子Ｔ２に接続されている。第２コイルＬ２２の第３端Ｅ２３はグランド端子ＧＮＤに接続されていて、第２コイルＬ２２の第４端Ｅ２４は第２入出力端子Ｔ２に接続されている。図８中の破線は層間接続導体による接続関係を示している。 The first end E11 of the first coil L11 is connected to the first input / output terminal T1, and the second end E12 is connected to the second input / output terminal T2. The third end E13 of the second coil L12 is connected to the ground terminal GND, and the fourth end E14 of the second coil L12 is connected to the second input / output terminal T2. Similarly, the first end E21 of the first coil L21 is connected to the first input / output terminal T1, and the second end E22 is connected to the second input / output terminal T2. The third end E23 of the second coil L22 is connected to the ground terminal GND, and the fourth end E24 of the second coil L22 is connected to the second input / output terminal T2. The broken line in FIG. 8 shows the connection relationship by the interlayer connection conductor.

　図９Ａ、図９Ｂは整合回路１２の回路図である。図９Ｂは整合回路１２の等価回路図である。図９Ａに示すように、第１の第１コイルＬ１１と第２の第１コイルＬ２１とは並列接続されていて、第１の第２コイルＬ１２と第２の第２コイルＬ２２とは並列接続されている。したがって、整合回路１２は図９Ｂのように表すことができる。このように、整合回路１２は、第１コイルＬ１と第２コイルＬ２によるオートトランス回路で構成される。第１コイルＬ１の自己インダクタンスは第１コイルＬ１１，Ｌ２１による自己インダクタンスであり、第２コイルＬ２の自己インダクタンスは第２コイルＬ１２，Ｌ２２による自己インダクタンスである。 9A and 9B are circuit diagrams of the matching circuit 12. FIG. 9B is an equivalent circuit diagram of the matching circuit 12. As shown in FIG. 9A, the first coil L11 and the second coil L21 are connected in parallel, and the first coil L12 and the second coil L22 are connected in parallel. ing. Therefore, the matching circuit 12 can be represented as shown in FIG. 9B. As described above, the matching circuit 12 is composed of an autotransformer circuit composed of the first coil L1 and the second coil L2. The self-inductance of the first coil L1 is the self-inductance of the first coils L11 and L21, and the self-inductance of the second coil L2 is the self-inductance of the second coils L12 and L22.

《第２の実施形態》
　第２の実施形態では、第２スイッチ及び第２キャパシタを備えるアンテナ装置について示す。 << Second Embodiment >>
The second embodiment shows an antenna device including a second switch and a second capacitor.

　図１０Ａ、図１０Ｂは、第２の実施形態に係るアンテナシステム５０２の構成を示す回路図である。このアンテナシステム５０２は、第１アンテナ装置１０２と第３アンテナ装置３０２とで構成されている。 10A and 10B are circuit diagrams showing the configuration of the antenna system 502 according to the second embodiment. The antenna system 502 includes a first antenna device 102 and a third antenna device 302.

　第１アンテナ装置１０２は、第１放射素子１１に対する第１給電回路１０の接続部Ｐ１と、第１放射素子１１と第１給電回路１０とをインピーダンス整合させる整合回路１２と、整合回路１２に接続されて整合回路１２の特性を切り替える第２切替回路１４と、第２切替回路１４を制御する制御回路と、を備える。 The first antenna device 102 is connected to a matching circuit 12 and a matching circuit 12 that impedance-matches the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11. A second switching circuit 14 for switching the characteristics of the matching circuit 12 and a control circuit for controlling the second switching circuit 14 are provided.

　第３アンテナ装置３０２は、第３放射素子３１に対する第３給電回路３０の接続部Ｐ３と、第３放射素子３１と第３給電回路３０とをインピーダンス整合させる整合回路３２と、を備える。 The third antenna device 302 includes a connection portion P3 of the third feeding circuit 30 to the third radiating element 31, and a matching circuit 32 that impedance-matches the third radiating element 31 and the third feeding circuit 30.

　第１アンテナ装置１０２は例えばセルラー用のアンテナ装置であり、第３アンテナ装置３０２は例えば４ＧＨｚ帯を用いるセルラー用のアンテナ装置とする。第１アンテナ装置１０２を用いる通信周波数帯と第３アンテナ装置３０２を用いる通信周波数帯とは異なるが隣接している。 The first antenna device 102 is, for example, an antenna device for cellular, and the third antenna device 302 is, for example, an antenna device for cellular using a 4 GHz band. The communication frequency band using the first antenna device 102 and the communication frequency band using the third antenna device 302 are different but adjacent to each other.

　第１アンテナ装置１０２の整合回路１２は、第１給電回路１０の接続部Ｐ１と第１放射素子１１との間に接続される第１コイルＬ１と、第１放射素子１１とグランドとの間に接続されて、第１コイルＬ１に対して磁界結合する第２コイルＬ２と、を有する。この第１コイルＬ１と第２コイルＬ２とでオートトランス回路が構成されている。 The matching circuit 12 of the first antenna device 102 is located between the first coil L1 connected between the connection portion P1 of the first feeding circuit 10 and the first radiating element 11 and between the first radiating element 11 and the ground. It has a second coil L2, which is connected and magnetically coupled to the first coil L1. The first coil L1 and the second coil L2 form an autotransformer circuit.

　第２切替回路１４は、例えば、第２キャパシタＣ２及び第２キャパシタＣ２に選択的に接続される第２スイッチＳＷ２を有する。この第２スイッチＳＷ２が第２キャパシタＣ２を介することなく第２コイルＬ２をグランドに接続する状態（第３状態）と、第２キャパシタＣ２を介してグランドに接続される状態（第４状態）とを切り替える。また、第２切替回路１４の第４状態は、第２切替回路１４の前記第３状態に比べて、第２コイルＬ２と前記グランドと間のキャパシタンスが大きい、といえる。ここでは、第２切替回路１４が第２キャパシタＣ２及び第２スイッチＳＷ２を有する例を示したが、これに限らず、可変リアクタンス素子やｐｉｎダイオード等を用いてもよい。 The second switching circuit 14 has, for example, a second switch SW2 selectively connected to the second capacitor C2 and the second capacitor C2. A state in which the second switch SW2 is connected to the ground via the second capacitor C2 (third state) and a state in which the second coil L2 is connected to the ground via the second capacitor C2 (fourth state). To switch. Further, it can be said that the fourth state of the second switching circuit 14 has a larger capacitance between the second coil L2 and the ground than the third state of the second switching circuit 14. Here, an example in which the second switching circuit 14 has the second capacitor C2 and the second switch SW2 is shown, but the present invention is not limited to this, and a variable reactance element, a pin diode, or the like may be used.

　図１０Ａに示すように、第２スイッチＳＷ２がグランドを選択している状態は「第３状態」に対応し、図１０Ｂに示すように、第２スイッチＳＷ２が第２キャパシタＣ２を選択している状態は「第４状態」に対応する。 As shown in FIG. 10A, the state in which the second switch SW2 selects the ground corresponds to the “third state”, and as shown in FIG. 10B, the second switch SW2 selects the second capacitor C2. The state corresponds to the "fourth state".

　図１１Ａは図１０Ａに示した第３状態での、第１給電回路１０の接続部Ｐ１から第１放射素子１１方向を視た反射係数の周波数特性を示すスミスチャートである。また、図１１Ｂは図１０Ｂに示した第４状態での、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視た反射係数の周波数特性を示すスミスチャートである。 FIG. 11A is a Smith chart showing the frequency characteristics of the reflection coefficient when the direction of the first radiating element 11 is viewed from the connection portion P1 of the first feeding circuit 10 in the third state shown in FIG. 10A. Further, FIG. 11B is a Smith chart showing the frequency characteristics of the reflection coefficient when the matching circuit 12 is viewed from the connection portion P0 of the first radiation element 11 in the fourth state shown in FIG. 10B.

　第３状態では、図１１Ａに表れているように、マーカーＭ０３で示す周波数を中心として所定周波数帯に亘って第１放射素子１１は第１給電回路１０のインピーダンスである５０Ωに整合する。 In the third state, as shown in FIG. 11A, the first radiating element 11 matches the impedance of the first feeding circuit 10 of 50Ω over a predetermined frequency band centered on the frequency indicated by the marker M03.

　第４状態では、図１１Ｂに表れているように、周波数４．０６ＧＨｚにおいて、マーカーＭ０４で示すインピーダンスとなる。この例では、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視たインピーダンスは３．９９－ｊ５１．８［Ω］であり、その実部は、第１給電回路１０のインピーダンス（５０Ω）の１／５倍以下である。この周波数は第２コイルＬ２と第２キャパシタＣ２との直列共振周波数である。つまり、第１放射素子１１の接続部Ｐ０から整合回路１２方向を視たインピーダンスは実質的にショートとなる。本発明においては、第１給電回路１０のインピーダンスの１／５倍以下の状態を、「実質的にショート」と表現する。 In the fourth state, as shown in FIG. 11B, the impedance is the impedance indicated by the marker M04 at a frequency of 4.06 GHz. In this example, the impedance when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiating element 11 is 3.9-j51.8 [Ω], and the actual portion is the impedance (50Ω) of the first feeding circuit 10. It is 1/5 times or less of. This frequency is the series resonance frequency of the second coil L2 and the second capacitor C2. That is, the impedance when the matching circuit 12 direction is viewed from the connection portion P0 of the first radiating element 11 is substantially short-circuited. In the present invention, a state of 1/5 times or less of the impedance of the first feeding circuit 10 is expressed as "substantially short circuit".

　このように、第４状態では、第３アンテナ装置３０２の第３放射素子３１から見て、第１アンテナ装置１０２の第１放射素子１１は実質的にショートに見えるので、第３アンテナ装置３０２の第３放射素子３１は第１アンテナ装置１０２の第１放射素子１１の干渉を殆ど受けない。 As described above, in the fourth state, the first radiating element 11 of the first antenna device 102 looks substantially short when viewed from the third radiating element 31 of the third antenna device 302. The third radiating element 31 receives almost no interference from the first radiating element 11 of the first antenna device 102.

　図１２は、上記第１アンテナ装置１０２の状態と、第１アンテナ装置１０２及び第３アンテナ装置３０２の使用周波数帯域との関係を示す図である。 FIG. 12 is a diagram showing the relationship between the state of the first antenna device 102 and the frequency band used by the first antenna device 102 and the third antenna device 302.

　図１２に表れているように、第１アンテナ装置１０２を用いて通信を行う周波数帯は周波数帯域Ｂであり、第３アンテナ装置３０２を用いて通信を行う周波数帯は周波数帯域Ｄである。各周波数帯域の高低関係は、周波数帯域Ｂ＜周波数帯域Ｄである。 As shown in FIG. 12, the frequency band for communication using the first antenna device 102 is the frequency band B, and the frequency band for communication using the third antenna device 302 is the frequency band D. The high-low relationship of each frequency band is frequency band B <frequency band D.

　第１アンテナ装置１０２を用いて周波数帯域Ｂで通信を行う場合、第２スイッチＳＷ２がグランドを選択する第３状態とする。第３アンテナ装置３０２を用いて周波数帯域Ｄで通信を行う場合、第２スイッチＳＷ２が第２キャパシタＣ２を選択する第４状態とする。これにより、第３アンテナ装置３０２は第１アンテナ装置１０２の干渉を殆ど受けることなく、第３放射素子３１の放射効率が高く維持されて、周波数帯域Ｄによる通信が成される。 When communicating in the frequency band B using the first antenna device 102, the second switch SW2 is in the third state of selecting the ground. When communication is performed in the frequency band D using the third antenna device 302, the second switch SW2 is in the fourth state of selecting the second capacitor C2. As a result, the third antenna device 302 hardly receives the interference of the first antenna device 102, the radiation efficiency of the third radiation element 31 is maintained high, and communication is performed in the frequency band D.

　図１３は第２の実施形態の別の第１アンテナ装置１０２の構成を示す回路図である。この第１アンテナ装置１０２は、第１放射素子１１に対する第１給電回路１０の接続部Ｐ１と、第１放射素子１１と第１給電回路１０とをインピーダンス整合させる整合回路１２と、整合回路１２に接続されて整合回路１２の特性を切り替える第２切替回路１４と、整合回路１２を制御する制御回路と、を備える。図１０Ａ、図１０Ｂに示したアンテナ装置１０２とは、第２切替回路１４の構成が異なる。第２切替回路１４は、第２キャパシタＣ２及び第２スイッチＳＷ２を有するが、図１３に示す例では、第２キャパシタＣ２は第２スイッチＳＷ２の浮遊容量で構成されている。 FIG. 13 is a circuit diagram showing the configuration of another first antenna device 102 according to the second embodiment. The first antenna device 102 is provided in a matching circuit 12 and a matching circuit 12 for impedance matching the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11. A second switching circuit 14 that is connected to switch the characteristics of the matching circuit 12 and a control circuit that controls the matching circuit 12 are provided. The configuration of the second switching circuit 14 is different from that of the antenna device 102 shown in FIGS. 10A and 10B. The second switching circuit 14 has a second capacitor C2 and a second switch SW2, but in the example shown in FIG. 13, the second capacitor C2 is composed of the stray capacitance of the second switch SW2.

　図１３において、第２スイッチＳＷ２がオフ状態のとき、この第２スイッチＳＷ２の浮遊容量による第２キャパシタＣ２を介して第２コイルＬ２がグランドに接続され、第２スイッチＳＷ２がオン状態のとき、第２コイルＬ２が直接グランドに接続され、第２キャパシタＣ２は表れない。 In FIG. 13, when the second switch SW2 is in the off state, the second coil L2 is connected to the ground via the second capacitor C2 due to the stray capacitance of the second switch SW2, and when the second switch SW2 is in the on state. The second coil L2 is directly connected to the ground, and the second capacitor C2 does not appear.

　図１３に示すように、第２キャパシタＣ２は第２スイッチＳＷ２の浮遊容量で構成してもよい。また、第２キャパシタＣ２を、図１０Ａ、図１０Ｂに示したような実体的な素子としてのキャパシタと、図１３に示した浮遊容量との並列接続回路で構成してもよい。つまり、第２キャパシタＣ２は第２スイッチＳＷ２の浮遊容量を含んでいてもよい。 As shown in FIG. 13, the second capacitor C2 may be configured by the stray capacitance of the second switch SW2. Further, the second capacitor C2 may be configured by a parallel connection circuit of a capacitor as a substantive element as shown in FIGS. 10A and 10B and a stray capacitance shown in FIG. That is, the second capacitor C2 may include the stray capacitance of the second switch SW2.

　図１４は第２の実施形態のさらに別の第１アンテナ装置１０２の構成を示す回路図である。図１０Ａ、図１０Ｂに示したアンテナ装置１０２とは、第２切替回路１４の構成が異なる。第２切替回路１４は、第２キャパシタＣ２及び第２スイッチＳＷ２を有するが、図１４に示す例では、グランド側に第２スイッチＳＷ２を設けている。このように、第２スイッチＳＷ２と第２キャパシタＣ２との接続順序はどちらであってもよい。 FIG. 14 is a circuit diagram showing the configuration of still another first antenna device 102 according to the second embodiment. The configuration of the second switching circuit 14 is different from that of the antenna device 102 shown in FIGS. 10A and 10B. The second switching circuit 14 has a second capacitor C2 and a second switch SW2, but in the example shown in FIG. 14, the second switch SW2 is provided on the ground side. As described above, the connection order of the second switch SW2 and the second capacitor C2 may be either.

《第３の実施形態》
　第３の実施形態では、第１スイッチ、第１キャパシタ、第２スイッチ及び第２キャパシタを備えるアンテナ装置について示す。 << Third Embodiment >>
A third embodiment shows an antenna device including a first switch, a first capacitor, a second switch, and a second capacitor.

　図１５は第３の実施形態に係るアンテナシステム５０３の構成を示す回路図である。このアンテナシステム５０３は、第１アンテナ装置１０３と第４アンテナ装置４０３とで構成されている。本実施形態において、第４アンテナ装置４０３は、本発明に係る「第２アンテナ装置」及び「第３アンテナ装置」の構成を含んでいる。 FIG. 15 is a circuit diagram showing the configuration of the antenna system 503 according to the third embodiment. The antenna system 503 includes a first antenna device 103 and a fourth antenna device 403. In the present embodiment, the fourth antenna device 403 includes the configurations of the "second antenna device" and the "third antenna device" according to the present invention.

　第１アンテナ装置１０３は、第１放射素子１１に対する第１給電回路１０の接続部Ｐ１と、第１放射素子１１と第１給電回路１０とをインピーダンス整合させる整合回路１２と、整合回路１２に接続されて整合回路１２の特性を切り替える第１切替回路１３及び第２切替回路１４と、第１切替回路１３及び第２切替回路１４を制御する制御回路と、を備える。 The first antenna device 103 is connected to a matching circuit 12 and a matching circuit 12 that impedance-matches the first radiation element 11 and the first feeding circuit 10 with the connection portion P1 of the first feeding circuit 10 to the first radiation element 11. It is provided with a first switching circuit 13 and a second switching circuit 14 for switching the characteristics of the matching circuit 12, and a control circuit for controlling the first switching circuit 13 and the second switching circuit 14.

　第４アンテナ装置４０３は、第４放射素子４１に対する第４給電回路４０の接続部Ｐ４と、第４放射素子４１と第４給電回路４０とをインピーダンス整合させる整合回路４２と、を備える。 The fourth antenna device 403 includes a connection portion P4 of the fourth feeding circuit 40 to the fourth radiating element 41, and a matching circuit 42 that impedance-matches the fourth radiating element 41 and the fourth feeding circuit 40.

　第１アンテナ装置１０３は例えばセルラー用のアンテナ装置であり、第４アンテナ装置４０３は例えば無線ＬＡＮ用のアンテナ装置である。第１アンテナ装置１０３を用いる通信周波数帯と第４アンテナ装置４０３を用いる通信周波数帯とは異なるが隣接している。 The first antenna device 103 is, for example, an antenna device for cellular, and the fourth antenna device 403 is, for example, an antenna device for wireless LAN. The communication frequency band using the first antenna device 103 and the communication frequency band using the fourth antenna device 403 are different but adjacent to each other.

　第１切替回路１３の構成は第１の実施形態で示したとおりである。また、第２切替回路１４の構成は第２の実施形態で示したとおりである。その他の構成は第１の実施形態及び第２の実施形態で示したとおりである。 The configuration of the first switching circuit 13 is as shown in the first embodiment. The configuration of the second switching circuit 14 is as shown in the second embodiment. Other configurations are as shown in the first embodiment and the second embodiment.

　第１アンテナ装置１０３は、第１スイッチＳＷ１の状態と第２スイッチＳＷ２の状態との組み合わせによって、４つの状態をとり得る。 The first antenna device 103 can take four states depending on the combination of the state of the first switch SW1 and the state of the second switch SW2.

　図１６は、上記第１アンテナ装置１０３の状態と、第１アンテナ装置１０３及び第４アンテナ装置４０３の使用周波数帯域との関係を示す図である。 FIG. 16 is a diagram showing the relationship between the state of the first antenna device 103 and the frequency band used by the first antenna device 103 and the fourth antenna device 403.

　図１６に表れているように、第１アンテナ装置１０３を用いて通信を行う周波数帯は周波数帯域Ａ又は周波数帯域Ｂであり、第４アンテナ装置４０３を用いて通信を行う周波数帯は周波数帯域Ｃ又は周波数帯域Ｄである。各周波数帯域の高低関係は、周波数帯域Ｃ＜周波数帯域Ａ＜周波数帯域Ｄ＜周波数帯域Ｂである。 As shown in FIG. 16, the frequency band for communication using the first antenna device 103 is the frequency band A or the frequency band B, and the frequency band for communication using the fourth antenna device 403 is the frequency band C. Or the frequency band D. The high-low relationship of each frequency band is frequency band C <frequency band A <frequency band D <frequency band B.

　第１コイルＬ１と第１キャパシタＣ１との並列共振周波数は周波数帯域Ｃ内にあり、第２コイルＬ２と第２キャパシタＣ２との直列共振周波数は周波数帯域Ｄ内にある。 The parallel resonance frequency of the first coil L1 and the first capacitor C1 is in the frequency band C, and the series resonance frequency of the second coil L2 and the second capacitor C2 is in the frequency band D.

　第１アンテナ装置１０３を用いて周波数帯域Ａ又は周波数帯域Ｂで通信を行う場合、第１スイッチＳＷ１がオフである第１状態とし、第２スイッチＳＷ２がグランドを選択する第３状態とする。第４アンテナ装置４０３を用いて周波数帯域Ｃで通信を行う場合、第１スイッチＳＷ１がオンである第２状態とする。これにより、第４アンテナ装置４０３は第１アンテナ装置１０３の干渉を殆ど受けることなく、第４放射素子４１の放射効率が高く維持されて、周波数帯域Ｃによる無線ＬＡＮの通信が成される。また、第４アンテナ装置４０３を用いて周波数帯域Ｄで通信を行う場合、第２スイッチＳＷ２が第２キャパシタＣ２を選択する第４状態とする。これにより、第４アンテナ装置４０３は第１アンテナ装置１０３の干渉を殆ど受けることなく、第４放射素子４１の放射効率が高く維持されて、周波数帯域Ｄによる無線ＬＡＮの通信が成される。 When communicating in the frequency band A or the frequency band B using the first antenna device 103, the first state is set in which the first switch SW1 is off, and the third state is set in which the second switch SW2 selects the ground. When communication is performed in the frequency band C using the fourth antenna device 403, the first switch SW1 is set to the second state in which it is on. As a result, the fourth antenna device 403 receives almost no interference from the first antenna device 103, the radiation efficiency of the fourth radiating element 41 is maintained high, and wireless LAN communication is performed in the frequency band C. Further, when the fourth antenna device 403 is used for communication in the frequency band D, the second switch SW2 is in the fourth state of selecting the second capacitor C2. As a result, the fourth antenna device 403 receives almost no interference from the first antenna device 103, the radiation efficiency of the fourth radiating element 41 is maintained high, and wireless LAN communication is performed in the frequency band D.

　なお、第１スイッチＳＷ１がオンである第２状態とするとき、第２スイッチＳＷ２が第２キャパシタＣ２を選択する第４状態としてもよいし、第２スイッチＳＷ２が第２キャパシタＣ２を選択する第４状態であるとき、第１スイッチＳＷ１をオンして第２状態としてもよい。 When the first switch SW1 is in the second state of being on, the second switch SW2 may be in the fourth state of selecting the second capacitor C2, or the second switch SW2 may select the second capacitor C2. When there are four states, the first switch SW1 may be turned on to set the second state.

　図１７は第３の実施形態に係る別の第１アンテナ装置１０３の回路図である。この例では、第１給電回路１０の接続部Ｐ１と整合回路１２との間に整合回路１５が設けられている。また、第１放射素子１１の接続部Ｐ０と整合回路１２との間に整合回路１６が設けられている。整合回路１２、第１切替回路１３及び第２切替回路１４の構成はこれまでに示したとおりである。 FIG. 17 is a circuit diagram of another first antenna device 103 according to the third embodiment. In this example, a matching circuit 15 is provided between the connection portion P1 of the first feeding circuit 10 and the matching circuit 12. Further, a matching circuit 16 is provided between the connecting portion P0 of the first radiating element 11 and the matching circuit 12. The configurations of the matching circuit 12, the first switching circuit 13, and the second switching circuit 14 are as shown above.

　このように、トランス型の整合回路１２以外に整合回路１５，１６を設けてもよい。 As described above, matching circuits 15 and 16 may be provided in addition to the transformer type matching circuit 12.

　図１８は、第３の実施形態に係るさらに別の第１アンテナ装置１０３の回路図である。この例では、第１切替回路１３及び第２切替回路１４に付加回路を設けている。整合回路１２の第１入出力端子Ｔ１と第２入出力端子Ｔ２との間に、第１キャパシタＣ１、インダクタＬ３及び第１スイッチＳＷ１による切替回路１３が接続されている。また、整合回路１２のグランド端子ＧＮＤとグランドとの間に、第２スイッチＳＷ２、第２キャパシタＣ２及びインダクタＬ４による回路が接続されている。したがって、第１スイッチＳＷ１又は第２スイッチＳＷ２の選択によって、整合回路１２の整合特性に様々な周波数依存性を付与できる。 FIG. 18 is a circuit diagram of still another first antenna device 103 according to the third embodiment. In this example, an additional circuit is provided in the first switching circuit 13 and the second switching circuit 14. A switching circuit 13 by a first capacitor C1, an inductor L3, and a first switch SW1 is connected between the first input / output terminal T1 and the second input / output terminal T2 of the matching circuit 12. Further, a circuit by the second switch SW2, the second capacitor C2 and the inductor L4 is connected between the ground terminal GND of the matching circuit 12 and the ground. Therefore, various frequency dependences can be imparted to the matching characteristics of the matching circuit 12 by selecting the first switch SW1 or the second switch SW2.

《第４の実施形態》
　第４の実施形態では、通信端末装置の構成例について例示する。 << Fourth Embodiment >>
In the fourth embodiment, a configuration example of the communication terminal device will be illustrated.

　図１９は第４の実施形態の通信端末装置６０１の平面図である。ただし、筐体６００の上半分を取り外した状態を表している。この通信端末装置６０１は、回路基板６０とそれを内包する筐体６００とを備える。筐体６００は導電性のフレーム５０を有する。アンテナ装置１０１はフレーム５０の一部と回路基板６０の一部とで構成されている。回路基板６０には後に示す給電回路が構成されている。 FIG. 19 is a plan view of the communication terminal device 601 according to the fourth embodiment. However, it represents a state in which the upper half of the housing 600 is removed. The communication terminal device 601 includes a circuit board 60 and a housing 600 containing the circuit board 60. The housing 600 has a conductive frame 50. The antenna device 101 is composed of a part of the frame 50 and a part of the circuit board 60. The circuit board 60 is configured with a power supply circuit shown later.

　図２０は、図１９に示した通信端末装置６０１のＸ－Ｘ部分での断面図である。回路基板６０の上面にはグランド導体６０Ｇが形成されている。このグランド導体６０Ｇは筐体６００の導体部に電気的に接続されている。回路基板６０は多層基板であるが、図２０においては内部の層についての図示を省略している。 FIG. 20 is a cross-sectional view taken along the line XX of the communication terminal device 601 shown in FIG. A ground conductor 60G is formed on the upper surface of the circuit board 60. The ground conductor 60G is electrically connected to the conductor portion of the housing 600. Although the circuit board 60 is a multilayer board, the illustration of the internal layer is omitted in FIG. 20.

　図２１Ａ、図２１Ｂは、フレーム５０の一部を利用して構成された第１放射素子１１及び第２放射素子２１の構成を示す図である。図２１Ａに示す例では、第１放射素子１１はループアンテナを構成していて、第２放射素子２１はＴ分岐型アンテナを構成している。上記第１放射素子１１は回路基板６０のグランド導体６０Ｇとともにループを構成する。上記第２放射素子２１に近接する回路基板６０のグランド導体６０Ｇはイメージ形成用導体として作用する。 21A and 21B are diagrams showing the configurations of the first radiating element 11 and the second radiating element 21 configured by using a part of the frame 50. In the example shown in FIG. 21A, the first radiating element 11 constitutes a loop antenna, and the second radiating element 21 constitutes a T-branch type antenna. The first radiating element 11 forms a loop together with the ground conductor 60G of the circuit board 60. The ground conductor 60G of the circuit board 60 close to the second radiating element 21 acts as an image forming conductor.

　図２１Ｂに示す例では、第１放射素子１１は逆Ｆ型アンテナを構成していて、第２放射素子２１は逆Ｌ型アンテナを構成している。上記第１放射素子１１に近接する回路基板６０のグランド導体６０Ｇはイメージ形成用導体として作用する。同様に、上記第２放射素子２１に近接する回路基板６０のグランド導体６０Ｇはイメージ形成用導体として作用する。 In the example shown in FIG. 21B, the first radiating element 11 constitutes an inverted F-shaped antenna, and the second radiating element 21 constitutes an inverted L-shaped antenna. The ground conductor 60G of the circuit board 60 close to the first radiating element 11 acts as an image forming conductor. Similarly, the ground conductor 60G of the circuit board 60 close to the second radiating element 21 acts as an image forming conductor.

　本実施形態によれば、第１放射素子１１を有する第１アンテナ装置と第２放射素子２１を有する第２アンテナ装置との干渉が抑制されたアンテナシステム、及びこのアンテナシステムを備える通信端末装置が得られる。 According to the present embodiment, an antenna system in which interference between a first antenna device having a first radiating element 11 and a second antenna device having a second radiating element 21 is suppressed, and a communication terminal device including this antenna system are provided. can get.

　最後に、本発明は上述した実施形態に限られるものではない。当業者によって適宜変形及び変更が可能である。本発明の範囲は、上述の実施形態ではなく、特許請求の範囲によって示される。さらに、本発明の範囲には、特許請求の範囲内と均等の範囲内での実施形態からの変形及び変更が含まれる。 Finally, the present invention is not limited to the above-described embodiment. It can be appropriately modified and changed by those skilled in the art. The scope of the invention is indicated by the claims, not by the embodiments described above. Further, the scope of the present invention includes modifications and modifications from the embodiments within the scope of the claims and within the scope of the claims.

　例えば、以上に示した実施形態では、第１アンテナ装置１０１をセルラー通信に用い、第２アンテナ装置２０１を無線ＬＡＮに用いることを例示したが、第１アンテナ装置と、この第１アンテナ装置以外の第２アンテナ装置等を同じ通信システム（例えばセルラー通信）に用いる場合にも本発明は適用できる。 For example, in the embodiment shown above, it is exemplified that the first antenna device 101 is used for cellular communication and the second antenna device 201 is used for wireless LAN, but the first antenna device and the first antenna device are other than the first antenna device and the first antenna device. The present invention can also be applied when the second antenna device or the like is used for the same communication system (for example, cellular communication).

　また、以上に示した実施形態では、第１放射素子１１又は第２放射素子２１の例として、ループアンテナ、Ｔ分岐形アンテナ、逆Ｌ型アンテナ、逆Ｆ型アンテナ等を例示したが、その他に、モノポールやダイポールアンテナ等を用いることができる。 Further, in the embodiment shown above, as an example of the first radiating element 11 or the second radiating element 21, a loop antenna, a T-branched antenna, an inverted L-shaped antenna, an inverted F-shaped antenna, and the like are exemplified. , Monopole, dipole antenna, etc. can be used.

　また、以上に示した実施形態では、第１アンテナ装置１０１等のインピーダンスが第１給電回路１０のインピーダンスより低い例を示したが、この高低関係が逆であっても、本発明は適用できる。 Further, in the embodiment shown above, an example in which the impedance of the first antenna device 101 or the like is lower than the impedance of the first feeding circuit 10 is shown, but the present invention can be applied even if the height relationship is reversed.

Ｃ１…第１キャパシタ
Ｃ２…第２キャパシタ
Ｅ１１…第１端
Ｅ１２…第２端
Ｅ１３…第３端
Ｅ１４…第４端
Ｅ２１…第１端
Ｅ２２…第２端
Ｅ２３…第３端
Ｅ２４…第４端
ＧＮＤ…グランド端子
Ｌ１，Ｌ１１，Ｌ２１…第１コイル
Ｌ２，Ｌ１２，Ｌ２２…第２コイル
Ｌ３，Ｌ４…インダクタ
ＮＣ…空き端子
Ｐ０…第１放射素子１１の接続部
Ｐ１…第１給電回路の接続部
Ｐ２…第２給電回路２０の接続部
Ｐ３…第３給電回路３０の接続部
Ｐ４…第４給電回路４０の接続部
Ｐ１１，Ｐ１２，Ｐ１３，Ｐ１４，Ｐ１５，Ｐ１６…導体パターン
Ｐ２１，Ｐ２２，Ｐ２３，Ｐ２４，Ｐ２５，Ｐ２６…導体パターン
Ｓ１～Ｓ１４…基材層
ＳＷ１…第１スイッチ
ＳＷ２…第２スイッチ
Ｔ１…第１入出力端子
Ｔ２…第２入出力端子
１０…第１給電回路
１１…第１放射素子
１２…整合回路
１３…第１切替回路
１４…第２切替回路
１５，１６…整合回路
２０…第２給電回路
２１…第２放射素子
２２…整合回路
３０…第３給電回路
３１…第３放射素子
３２…整合回路
４０…第４給電回路
４１…第４放射素子
４２…整合回路
５０…フレーム
６０…回路基板
６０Ｇ…グランド導体
６１，６２…送信回路
７０…ベースバンド回路
７１，７２…ＲＦモジュール
８１，８２…受信回路
１０１～１０３…第１アンテナ装置
２０１…第２アンテナ装置
３０２…第３アンテナ装置
４０３…第４アンテナ装置
５０１～５０３…アンテナシステム
６００…筐体
６０１…通信端末装置 C1 ... 1st capacitor C2 ... 2nd capacitor E11 ... 1st end E12 ... 2nd end E13 ... 3rd end E14 ... 4th end E21 ... 1st end E22 ... 2nd end E23 ... 3rd end E24 ... 4th end GND ... Ground terminals L1, L11, L21 ... 1st coil L2, L12, L22 ... 2nd coil L3, L4 ... Capacitor NC ... Empty terminal P0 ... Connection part of 1st radiation element 11 P1 ... Connection part of 1st power supply circuit P2 ... Connection part of the second power supply circuit 20 P3 ... Connection part of the third power supply circuit 30 P4 ... Connection part of the fourth power supply circuit 40 P11, P12, P13, P14, P15, P16 ... Conductor patterns P21, P22, P23, P24, P25, P26 ... Conductor patterns S1 to S14 ... Substrate layer SW1 ... First switch SW2 ... Second switch T1 ... First input / output terminal T2 ... Second input / output terminal 10 ... First power supply circuit 11 ... First radiation Element 12 ... Matching circuit 13 ... First switching circuit 14 ... Second switching circuits 15, 16 ... Matching circuit 20 ... Second feeding circuit 21 ... Second radiation element 22 ... Matching circuit 30 ... Third feeding circuit 31 ... Third radiation Element 32 ... Matching circuit 40 ... Fourth power supply circuit 41 ... Fourth radiation element 42 ... Matching circuit 50 ... Frame 60 ... Circuit board 60G ... Ground conductor 61, 62 ... Transmission circuit 70 ... Base band circuit 71, 72 ... RF module 81 , 82 ... Receiving circuits 101 to 103 ... First antenna device 201 ... Second antenna device 302 ... Third antenna device 403 ... Fourth antenna device 501 to 503 ... Antenna system 600 ... Housing 601 ... Communication terminal device

Claims (16)

　第１放射素子と、
　前記第１放射素子に接続される第１給電回路と前記第１放射素子とをインピーダンス整合させる整合回路と、
　前記整合回路に接続されて当該整合回路を第１状態と第２状態とに切り替える第１切替回路と、
　を備え、
　前記整合回路は、
　　前記第１給電回路と前記第１放射素子との間に接続される第１コイルと、
　　前記第１放射素子とグランドとの間に接続されて、前記第１コイルに対して磁界結合する第２コイルと、
　を有し、
　前記第１切替回路の前記第２状態は、前記第１切替回路の前記第１状態に比べて、前記第１コイルの並列のキャパシタンスが大きい、
　アンテナ装置。 With the first radiating element
A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
A first switching circuit connected to the matching circuit and switching the matching circuit between the first state and the second state,
Equipped with
The matching circuit is
A first coil connected between the first feeding circuit and the first radiating element,
A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil,
Have,
In the second state of the first switching circuit, the parallel capacitance of the first coil is larger than that of the first state of the first switching circuit.
Antenna device. 　前記第１切替回路は、第１キャパシタ及び第１スイッチを有し、前記第１キャパシタが前記第１コイルに並列接続されない状態が前記第１状態であり、前記第１キャパシタが前記第１コイルに並列接続される状態が前記第２状態である、
　請求項１に記載のアンテナ装置。 The first switching circuit has a first capacitor and a first switch, and the state in which the first capacitor is not connected in parallel to the first coil is the first state, and the first capacitor is connected to the first coil. The state of being connected in parallel is the second state.
The antenna device according to claim 1. 　前記第１キャパシタは前記第１スイッチの浮遊容量を含む、
　請求項２に記載のアンテナ装置。 The first capacitor includes the stray capacitance of the first switch.
The antenna device according to claim 2. 　第１放射素子と、
　前記第１放射素子に接続される第１給電回路と前記第１放射素子とをインピーダンス整合させる整合回路と、
　前記整合回路に接続されて当該整合回路を第３状態と第４状態とに切り替える第２切替回路と、
　を備え、
　前記整合回路は、
　　前記第１給電回路と前記第１放射素子との間に接続される第１コイルと、
　　前記第１放射素子とグランドとの間に接続されて、前記第１コイルに対して磁界結合する第２コイルと、
　を有し、
　前記第２切替回路の前記第４状態は、前記第２切替回路の前記第３状態に比べて、前記第２コイルと前記グランドと間のキャパシタンスが大きい、
　アンテナ装置。 With the first radiating element
A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
A second switching circuit connected to the matching circuit and switching the matching circuit between the third state and the fourth state,
Equipped with
The matching circuit is
A first coil connected between the first feeding circuit and the first radiating element,
A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil,
Have,
The fourth state of the second switching circuit has a larger capacitance between the second coil and the ground than the third state of the second switching circuit.
Antenna device. 　前記第２切替回路は、第２キャパシタ及び当該第２キャパシタに選択的に接続される第２スイッチを有し、前記第２キャパシタを介することなく前記第２コイルが前記グランドに接続される状態が前記第３状態であり、前記第２キャパシタを介して前記第２コイルが前記グランドに接続される状態が前記第４状態である、
　請求項４に記載のアンテナ装置。 The second switching circuit has a second capacitor and a second switch selectively connected to the second capacitor, and the second coil is connected to the ground without passing through the second capacitor. The third state, and the state in which the second coil is connected to the ground via the second capacitor is the fourth state.
The antenna device according to claim 4. 　前記第２キャパシタは前記第２スイッチの浮遊容量を含む、
　請求項５に記載のアンテナ装置。 The second capacitor includes the stray capacitance of the second switch.
The antenna device according to claim 5. 　前記整合回路に接続されて当該整合回路を第３状態と第４状態とに切り替える第２切替回路を備え、
　前記第２切替回路の前記第４状態は、前記第２切替回路の前記第３状態に比べて、前記第２コイルと前記グランドと間のキャパシタンスが大きい、
　請求項１から３のいずれかに記載のアンテナ装置。 A second switching circuit connected to the matching circuit and switching the matching circuit between the third state and the fourth state is provided.
The fourth state of the second switching circuit has a larger capacitance between the second coil and the ground than the third state of the second switching circuit.
The antenna device according to any one of claims 1 to 3. 　第１通信周波数帯の信号を通信する第１放射素子を含む第１アンテナ装置と、
　第２通信周波数帯の信号を通信する第２放射素子を含む第２アンテナ装置と、
　を備え、
　前記第１アンテナ装置は、
　前記第１放射素子に接続される第１給電回路と前記第１放射素子とをインピーダンス整合させる整合回路と、
　前記整合回路に接続されて当該整合回路を第１状態と第２状態とに切り替える第１切替回路と、
　を備え、
　前記整合回路は、
　　前記第１給電回路と前記第１放射素子との間に接続される第１コイルと、
　　前記第１放射素子とグランドとの間に接続されて、前記第１コイルに対して磁界結合する第２コイルと、
　を有し、
　前記第１切替回路の前記第２状態は、前記第１切替回路の前記第１状態に比べて、前記第１コイルの並列のキャパシタンスが大きい、
　アンテナシステム。 A first antenna device including a first radiating element that communicates a signal in the first communication frequency band, and
A second antenna device including a second radiating element that communicates signals in the second communication frequency band, and
Equipped with
The first antenna device is
A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
A first switching circuit connected to the matching circuit and switching the matching circuit between the first state and the second state,
Equipped with
The matching circuit is
A first coil connected between the first feeding circuit and the first radiating element,
A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil,
Have,
In the second state of the first switching circuit, the parallel capacitance of the first coil is larger than that of the first state of the first switching circuit.
Antenna system. 　第１通信周波数帯の信号を通信する第１放射素子を含む第１アンテナ装置と、
　第３通信周波数帯の信号を通信する第３放射素子を含む第３アンテナ装置と、
　を備え、
　前記第１アンテナ装置は、
　前記第１放射素子に接続される第１給電回路と前記第１放射素子とをインピーダンス整合させる整合回路と、
　前記整合回路に接続されて当該整合回路を第３状態と第４状態とに切り替える第２切替回路と、
　を備え、
　前記整合回路は、
　　前記第１給電回路と前記第１放射素子との間に接続される第１コイルと、
　　前記第１放射素子とグランドとの間に接続されて、前記第１コイルに対して磁界結合する第２コイルと、
　を有し、
　前記第２切替回路の前記第４状態は、前記第２切替回路の前記第３状態に比べて、前記第２コイルと前記グランドと間のキャパシタンスが大きい、
　アンテナシステム。 A first antenna device including a first radiating element that communicates a signal in the first communication frequency band, and
A third antenna device including a third radiating element that communicates signals in the third communication frequency band, and
Equipped with
The first antenna device is
A matching circuit that impedance-matches the first feeding circuit connected to the first radiating element and the first radiating element.
A second switching circuit connected to the matching circuit and switching the matching circuit between the third state and the fourth state,
Equipped with
The matching circuit is
A first coil connected between the first feeding circuit and the first radiating element,
A second coil connected between the first radiating element and the ground and magnetically coupled to the first coil,
Have,
The fourth state of the second switching circuit has a larger capacitance between the second coil and the ground than the third state of the second switching circuit.
Antenna system. 　第３通信周波数帯の信号を通信する第３放射素子を含む第３アンテナ装置と、
　前記整合回路に接続されて当該整合回路を第３状態と第４状態とに切り替える第２切替回路を備え、
　前記第２切替回路の前記第４状態は、前記第２切替回路の前記第３状態に比べて、前記第２コイルと前記グランドと間のキャパシタンスが大きい、
　請求項８に記載のアンテナシステム。 A third antenna device including a third radiating element that communicates signals in the third communication frequency band, and
A second switching circuit connected to the matching circuit and switching the matching circuit between the third state and the fourth state is provided.
The fourth state of the second switching circuit has a larger capacitance between the second coil and the ground than the third state of the second switching circuit.
The antenna system according to claim 8. 　前記第１切替回路は、第１キャパシタ及び第１スイッチを有し、前記第１キャパシタが前記第１コイルに並列接続されない状態が前記第１状態であり、前記第１キャパシタが前記第１コイルに並列接続される状態が前記第２状態である、
　前記第１コイルと前記第１キャパシタとの並列共振周波数は前記第２通信周波数帯にある、
　請求項８又は１０に記載のアンテナシステム。 The first switching circuit has a first capacitor and a first switch, and the state in which the first capacitor is not connected in parallel to the first coil is the first state, and the first capacitor is connected to the first coil. The state of being connected in parallel is the second state.
The parallel resonance frequency of the first coil and the first capacitor is in the second communication frequency band.
The antenna system according to claim 8 or 10. 　前記第２通信周波数帯において、前記第１切替回路が前記第１状態のとき、前記第１放射素子の接続部からみた、前記整合回路のインピーダンスは実質的にオープンである、
　請求項８又は１０に記載のアンテナシステム。 In the second communication frequency band, when the first switching circuit is in the first state, the impedance of the matching circuit as seen from the connection portion of the first radiating element is substantially open.
The antenna system according to claim 8 or 10. 　前記第２切替回路が前記第４状態のとき、前記第２コイルと前記グランドとの間のキャパシタと前記第２コイルとの直列共振周波数は前記第３通信周波数帯にある、
　請求項９又は１０に記載のアンテナシステム。 When the second switching circuit is in the fourth state, the series resonance frequency between the capacitor between the second coil and the ground and the second coil is in the third communication frequency band.
The antenna system according to claim 9 or 10. 　前記第３通信周波数帯において、前記第２切替回路が前記第４状態のとき、前記第１放射素子の接続部からみた、前記整合回路のインピーダンスは実質的にショートである、
　請求項９又は１０に記載のアンテナシステム。 In the third communication frequency band, when the second switching circuit is in the fourth state, the impedance of the matching circuit as seen from the connection portion of the first radiating element is substantially short.
The antenna system according to claim 9 or 10. 　請求項８に記載のアンテナシステムと、請求項８に記載の第１給電回路と、請求項８に記載の第２放射素子に接続される第２給電回路とを備えた通信端末装置。 A communication terminal device including the antenna system according to claim 8, the first feeding circuit according to claim 8, and the second feeding circuit connected to the second radiating element according to claim 8. 　請求項９に記載のアンテナシステムと、請求項９に記載の第１給電回路と、請求項９に記載の第３放射素子に接続される第３給電回路とを備えた通信端末装置。 A communication terminal device including the antenna system according to claim 9, the first feeding circuit according to claim 9, and the third feeding circuit connected to the third radiating element according to claim 9.
PCT/JP2021/016932 2020-07-20 2021-04-28 Antenna device, antenna system, and communication terminal device Ceased WO2022018925A1 (en)

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