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WO2022018925A1 - Dispositif d'antenne, système d'antenne et dispositif terminal de communication - Google Patents

Dispositif d'antenne, système d'antenne et dispositif terminal de communication 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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English (en)
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.)
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Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP2022538591A priority Critical patent/JP7176667B2/ja
Priority to CN202190000411.4U priority patent/CN219203496U/zh
Publication of WO2022018925A1 publication Critical patent/WO2022018925A1/fr
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

Dans la présente invention, un premier dispositif d'antenne comporte : un premier élément de rayonnement ; une partie de connexion d'un premier circuit d'alimentation électrique, un circuit d'adaptation pour effectuer une adaptation d'impédance ; et un premier circuit de commutation qui commute entre les caractéristiques du circuit d'adaptation. Le circuit d'adaptation comprend : une première bobine qui est connectée entre le premier élément de rayonnement et la partie de connexion du premier circuit d'alimentation électrique ; et une seconde bobine qui est connectée entre le premier élément de rayonnement et la masse et qui effectue un couplage de champ magnétique par rapport à la première bobine. Le premier circuit de commutation comprend un premier condensateur et un premier commutateur. Le premier circuit de commutation commute entre un premier état dans lequel le premier condensateur n'est pas connecté à la première bobine et un second état dans lequel le premier condensateur est connecté en parallèle à la première bobine.
PCT/JP2021/016932 2020-07-20 2021-04-28 Dispositif d'antenne, système d'antenne et dispositif terminal de communication Ceased WO2022018925A1 (fr)

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JP2022538591A JP7176667B2 (ja) 2020-07-20 2021-04-28 アンテナ装置、アンテナシステム及び通信端末装置
CN202190000411.4U CN219203496U (zh) 2020-07-20 2021-04-28 天线装置、天线系统以及通信终端装置

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JP2020-123498 2020-07-20

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WO2025057592A1 (fr) * 2023-09-13 2025-03-20 株式会社村田製作所 Module d'antenne et appareil électronique

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JP2014075667A (ja) * 2012-10-03 2014-04-24 Fujitsu Ltd 携帯通信装置及びアンテナ切替方法
WO2015064138A1 (fr) * 2013-10-31 2015-05-07 株式会社村田製作所 Circuit de conversion d'impédance et dispositif terminal de communication
WO2015178204A1 (fr) * 2014-05-19 2015-11-26 株式会社村田製作所 Circuit d'adaptation d'antenne, module d'adaptation d'antenne, dispositif à antenne et appareil de radiocommunication
WO2017022370A1 (fr) * 2015-07-31 2017-02-09 株式会社村田製作所 Circuit d'adaptation d'antenne, circuit d'antenne, circuit frontal et dispositif de communication
WO2018052073A1 (fr) * 2016-09-16 2018-03-22 株式会社村田製作所 Dispositif de filtre d'onde acoustique de surface, multiplexeur, circuit à extrémité avant haute fréquence et dispositif de communication

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN213816426U (zh) * 2018-07-09 2021-07-27 株式会社村田制作所 天线装置及电子设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014075667A (ja) * 2012-10-03 2014-04-24 Fujitsu Ltd 携帯通信装置及びアンテナ切替方法
WO2015064138A1 (fr) * 2013-10-31 2015-05-07 株式会社村田製作所 Circuit de conversion d'impédance et dispositif terminal de communication
WO2015178204A1 (fr) * 2014-05-19 2015-11-26 株式会社村田製作所 Circuit d'adaptation d'antenne, module d'adaptation d'antenne, dispositif à antenne et appareil de radiocommunication
WO2017022370A1 (fr) * 2015-07-31 2017-02-09 株式会社村田製作所 Circuit d'adaptation d'antenne, circuit d'antenne, circuit frontal et dispositif de communication
WO2018052073A1 (fr) * 2016-09-16 2018-03-22 株式会社村田製作所 Dispositif de filtre d'onde acoustique de surface, multiplexeur, circuit à extrémité avant haute fréquence et dispositif de communication

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