WO2012032974A1 - Rfidモジュールおよびrfidデバイス - Google Patents
Rfidモジュールおよびrfidデバイス Download PDFInfo
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- WO2012032974A1 WO2012032974A1 PCT/JP2011/069689 JP2011069689W WO2012032974A1 WO 2012032974 A1 WO2012032974 A1 WO 2012032974A1 JP 2011069689 W JP2011069689 W JP 2011069689W WO 2012032974 A1 WO2012032974 A1 WO 2012032974A1
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- WIPO (PCT)
- Prior art keywords
- inductance
- inductance element
- rfid
- rfid module
- filter circuit
- 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.)
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Classifications
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/42—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
- H03H7/425—Balance-balance networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0021—Constructional details
- H03H2001/0085—Multilayer, e.g. LTCC, HTCC, green sheets
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
Definitions
- the present invention relates to an RFID module used in, for example, an RFID (Radio Frequency Identification) system and an RFID device provided therein.
- RFID Radio Frequency Identification
- an RFID system in which an RFID tag and a reader / writer communicate with each other in a non-contact manner and information is transmitted between the RFID tag and the reader / writer is known.
- the RFID tag includes an RFIC element in which ID information is written and an antenna for transmitting and receiving an RF signal.
- a filter for removing harmonic components generated in the RFIC element may be provided between the RFIC element and the antenna.
- a matching circuit configured by a capacitor or a coil between the RFIC element and the antenna. Is inserted.
- FIG. 1 the configuration of the IC module disclosed in Patent Document 1 is shown in FIG.
- a reader / writer transmission circuit By connecting an antenna to each input / output terminal of these circuit modules, the reader / writer is configured to perform non-contact communication with an external card IC.
- a filter is inserted between the reader / writer transmission circuit and the reader / writer transmission / reception antenna.
- JP 2004-145449 A JP 2001-188890 A JP 2009-027291 A
- the filter for removing harmonic components generated in the above-mentioned RFIC element is composed of a low-pass filter composed of a capacitor and an inductor, but an inductor having a relatively large inductance value is required. As a result, the size of RFID tags has increased.
- an object of the present invention is to provide an RFID module and an RFID device that are provided with a filter circuit for removing harmonic components of an RFIC element but are not enlarged as a whole.
- An RFID module of the present invention includes an RFIC element having a first input / output terminal and a second input / output terminal, a first inductance element connected to the first input / output terminal, and the second input / output terminal A filter circuit for removing harmonic components of the RFIC element, and a radiating element connected to the filter circuit, and the first inductance The element and the second inductance element are magnetically coupled to each other.
- the coupling coefficient between the first inductance element and the second inductance element is preferably 0.7 or more from the viewpoint of miniaturization.
- An inductance element and a capacitance element, or a matching circuit including an inductance element or a capacitance element may be provided between the filter circuit and the radiation element.
- the first inductance element is configured by a first multilayer coil element in which a plurality of loop-shaped conductors are stacked
- the second inductance element is a second multilayer in which a plurality of loop-shaped conductors are stacked.
- the winding axis of the loop-shaped conductor of the first multilayer coil element and the winding axis of the loop-shaped conductor of the second multilayer coil element overlap each other on substantially the same straight line. Is desirable. With this structure, the amount of magnetic flux passing through the inside of each loop conductor is maximized, so that the coupling coefficient can be further increased and the filter inductor can be further downsized.
- the coupling coefficient can be further increased.
- the inductor of the filter can be further downsized.
- the first inductance element and the second inductance element are built in a multilayer substrate formed by laminating a plurality of magnetic layers. With this structure, the coupling coefficient can be further increased, and the filter inductor can be further downsized.
- the inductance element or the capacitance element of the matching circuit is mounted, for example, on the surface of the multilayer substrate. With this structure, the matching circuit can be provided on the whole with almost no increase in size.
- a booster element that is coupled to the radiating element via an electromagnetic field to receive or transmit a radio signal.
- the radiating element is composed of a coiled conductor, and the coiled conductor and the booster element are electromagnetically coupled to each other.
- the radiating element is preferably built in the multilayer substrate. With this structure, it is possible to provide a radiating element with almost no overall increase in size.
- the RFID device of the present invention is provided between the RFIC element having the first input / output terminal and the second input / output terminal and the radiating element, and the configuration of the filter portion is as described above.
- (11) it is preferable to include an inductance element and a capacitance element, or a matching circuit including an inductance element or a capacitance element, connected to the radiation element side of the filter circuit.
- the inductor of the filter circuit for removing the harmonic component of the RFIC element can be reduced in size, and a small RFID module and RFID device can be configured.
- FIG. 1 is a diagram showing a configuration of an IC module disclosed in Patent Document 1.
- FIG. 2 is a circuit diagram of the RFID module 101 according to the first embodiment.
- FIG. 3 is a view showing a state in which the filter circuit 20 shown in FIG. 2 is built in a multilayer substrate formed by laminating a plurality of magnetic layers
- FIG. 3A is a perspective view seen through the internal conductor layer.
- FIG. 3 and FIG. 3 (B) are perspective views in which it is enlarged and displayed in the thickness direction.
- FIG. 4 is a plan view of each conductor layer of the multilayer substrate.
- FIG. 5 is a diagram showing a connection relationship of via conductors connecting the conductor layers of the multilayer substrate.
- FIG. 6A is a perspective view schematically showing the arrangement relationship between the first inductance element L1 and the second inductance element L2 shown in FIG. 3, and FIG. 6B is a diagram of a comparative example thereof.
- 7A is a plan view of the RFID device 50 shown in FIG. 2, and FIG. 7B is a bottom view thereof.
- FIG. 8 is a configuration diagram of the RFID module 101 using the RFID device 50.
- FIG. 9 is a diagram showing the relationship between the resonance frequency on the RFID tag side and the communication limit distance.
- 10A and 10B are diagrams showing the configuration of the filter circuit portion of the RFID device according to the second embodiment.
- FIG. 10A is a perspective view of the internal conductor layer seen through, and FIG. It is the perspective view expanded and displayed.
- FIG. 10A is a perspective view of the internal conductor layer seen through, and FIG. It is the perspective view expanded and displayed.
- FIG. 10A is a perspective view of the internal conductor layer seen through, and FIG. It is the perspective view
- FIG. 11 is a perspective view schematically showing the arrangement relationship between the first inductance element L1 and the second inductance element L2 shown in FIG.
- FIG. 12 is a circuit diagram of the RFID module 103 according to the third embodiment.
- 13A is a plan view of the RFID device 50 shown in FIG. 12, and
- FIG. 13B is a cross-sectional view thereof.
- FIG. 14 is a configuration diagram of the RFID module 103 using the RFID device 50.
- FIG. 15 is a diagram illustrating a current flowing through the coil conductor of the coupling radiating element 40C and a current flowing through the booster electrode 62 of the booster element 60.
- FIG. 16 is a diagram showing the relationship between the resonance frequency on the RFID tag side and the communication limit distance.
- FIG. 17 is an exploded perspective view of the RFID module 104 according to the fourth embodiment.
- 18A and 18B are diagrams showing two configurations of the RFID device according to the fifth embodiment.
- FIG. 2 is a circuit diagram of the RFID module 101 according to the first embodiment.
- the RFID module 101 includes an RFIC element 10, a filter circuit 20, a matching circuit 30, and a radiating element 40.
- the filter circuit 20 and the matching circuit 30 constitute an RFID device 50.
- the RFID circuit 50 is configured by the filter circuit 20 and the matching circuit 30, but the RFID device 50 may be configured by only the filter circuit 20.
- the RFIC element 10 is composed of a semiconductor integrated circuit, and includes a first transmission terminal Tx1, a second transmission terminal Tx2, and a reception terminal Rx.
- the transmission signal is balanced and output at the first transmission terminal Tx1 and the second transmission terminal Tx2.
- the reception signal is input unbalanced at the reception terminal Rx.
- the first transmission terminal Tx1 and the second transmission terminal Tx2 correspond to a “first input / output terminal” and a “second input / output terminal” recited in the claims.
- the filter circuit 20 includes a first inductance element L1, a second inductance element L2, and a capacitor C1.
- the first end of the first inductance element L1 is connected to the first transmission terminal Tx1 of the RFIC element 10
- the first end of the second inductance element L2 is connected to the second transmission terminal Tx2 of the RFIC element 10
- the first inductance element The second ends of L1 and the second inductance element L2 are connected to both ends of the capacitor C1.
- the filter circuit 20 removes harmonic components contained in the transmission signal of the RFIC element 10.
- the matching circuit 30 includes capacitors C2, C3, and C4.
- the first end of the capacitor C2 is connected to the first output end of the filter circuit 20
- the first end of the capacitor C3 is connected to the second output end of the filter circuit 20
- the second ends of the capacitors C2 and C3 are connected to the capacitor C4. Connected to both ends.
- the radiating element 40 is, for example, a loop coil antenna.
- the first inductance element L1 and the second inductance element L2 have the same inductance.
- the first inductance element L1 and the second inductance element L2 are magnetically coupled to each other so as to strengthen the magnetic flux.
- the inductance of the first inductance element L1 in the uncoupled state is L10
- the inductance of the second inductance element L2 in the uncoupled state is L20
- the mutual inductance of both is M
- the coupling coefficient is k
- the coupling When the inductance of the first inductance element L1 in the connected state is denoted by L1
- the inductance of the second inductance element L2 in the coupled state is denoted by L2, the inductance is connected between Tx1 and Tx2 and the capacitor C1.
- the inductances L10 and L20 necessary for setting the value to 800 nH are 432 nH. That is, the size can be reduced by about 0.54 times.
- the length of the loop conductor required to obtain the required inductance can be shortened, and the DC resistance can be reduced accordingly.
- the matching circuit 30 impedance-matches the filter circuit 20 and the radiating element 40 with the three capacitors C2, C3, and C4.
- the reception terminal Rx of the RFIC element 10 and one end of the capacitor C1 are connected, and a reception signal is input to the reception terminal Rx.
- the RFIC element 10 outputs a balanced 13.56 MHz rectangular wave signal from the transmission terminals Tx1 and Tx2.
- the radiating element 40 is driven via the filter circuit 20 and the matching circuit 30, and a 13.56 MHz magnetic field is radiated from the radiating element 40.
- the RFID tag receives the magnetic field signal and receives power, and changes the impedance of the wireless IC in the RFID tag based on its own ID, and the RFID tag side
- the impedance of the antenna resonance circuit is changed (ASK modulation).
- ASK modulation The impedance of the antenna resonance circuit is changed (ASK modulation).
- the RFID tag responds with an ID by reflection of energy.
- the RFIC element 10 receives the ASK-modulated response signal and decodes the ID.
- the 13.56 MHz drive voltage (current) is ASK modulated.
- the RFID tag receives data and commands from the RFIC element 10 by decoding the received carrier intensity change.
- FIG. 3 is a diagram showing a state in which the filter circuit 20 shown in FIG. 2 is built in a multilayer substrate formed by laminating a plurality of magnetic layers.
- 3A is a perspective view of the internal conductor layer seen through
- FIG. 3B is a perspective view of the enlarged view in the thickness direction.
- 4 is a plan view of each conductor layer of the multilayer substrate
- FIG. 5 is a diagram showing a connection relationship of via conductors connecting the conductor layers.
- the (a) layer is the lowermost layer, and the (k) layer is the uppermost layer.
- the via conductor is represented by a thin straight line.
- the first inductance element L1 is a first laminated coil element in which a plurality of loop-shaped conductors are laminated and helically wound inside the multilayer substrate MB.
- the second inductance element L ⁇ b> 2 is configured by a second laminated coil element that is configured, and in which a plurality of loop-shaped conductors are laminated and helically wound.
- Terminal electrodes P21A, P21B, P22A, and P22B are formed on the upper surface of the multilayer substrate MB.
- Terminal electrodes P11 and P12 are formed on the lower surface of the multilayer substrate MB.
- These terminal electrodes correspond to the portions indicated by the same reference numerals in the circuit shown in FIG.
- a chip capacitor corresponding to the capacitor C1 is mounted on the terminal electrodes P21B and P22B. Further, the chip capacitors corresponding to the capacitors C2 and C3 are mounted so that one end thereof is connected to the terminal electrodes P21A and P22A, respectively.
- the RFIC element 10 is connected to the terminal electrodes P11 and P12.
- FIG. 6A is a perspective view showing a simplified arrangement relationship between the first inductance element L1 and the second inductance element L2 shown in FIG.
- FIG. 6B is a diagram of the comparative example.
- the first inductance element L1 is composed of a first laminated coil element in which a plurality of loop-shaped conductors are laminated
- the second inductance element L2 is a second one in which a plurality of loop-shaped conductors are laminated.
- the winding axis of the loop conductor of the first multilayer coil element and the winding axis of the loop conductor of the second multilayer coil element overlap each other on substantially the same straight line. That is, it is in a coaxial relationship.
- the opening surface of the first multilayer coil element and the opening surface of the second multilayer coil element overlap.
- the loop conductor of the first multilayer coil element and the loop conductor of the second multilayer coil element are alternately laminated. ing. With such a loop-shaped conductor arrangement, the coupling coefficient k between the first inductance element L1 and the second inductance element L2 is about 0.85.
- the first laminated coil element constituting the first inductance element L1 and the second laminated coil element constituting the second inductance element L2 are juxtaposed side by side. Then, the coupling coefficient k between the first inductance element L1 and the second inductance element L2 is substantially zero.
- FIG. 7A is a plan view of the RFID device 50 shown in FIG. 2, and FIG. 7B is a bottom view thereof.
- chip capacitors C1, C2, C3, C41, C42, and ESD protection elements E1, E2 are mounted on the upper surface of the multilayer substrate MB, respectively.
- capacitors C1, C2, and C3 correspond to elements indicated by the same reference numerals in FIG.
- the capacitors C41 and C42 are connected in parallel and correspond to the capacitor C4 in FIG.
- the ESD protection elements E1 and E2 are disposed between the radiating element 40 shown in FIG. 2 and the ground.
- connection terminals (2) and (3) of the transmission terminals Tx1 and Tx2 As shown in FIG. 7B, on the lower surface of the multilayer substrate MB, the connection terminals (2) and (3) of the transmission terminals Tx1 and Tx2, the connection terminal (4) of the reception terminal Rx, and the connection of the radiation element 40 Terminals (6) and (7), ground terminals (5) and (8), and an NC terminal (1) are formed.
- the size required to obtain the required inductance can be reduced, and the multilayer The size of the substrate MB can be reduced, and the size of the RFID device 50 can be reduced.
- the first and second inductance elements are reduced in size by strongly coupling the elements, and the first and second inductance elements are built in the multilayer substrate so that the respective winding axes are substantially collinear.
- FIG. 8 is a configuration diagram of the RFID module 101 using the RFID device 50. Since the RFID device 50 is reduced in size, it can be disposed close to the RFIC element 10 and the RFID module 101 can be reduced in size.
- FIG. 9 is a diagram showing the relationship between the resonance frequency on the RFID tag side and the communication limit distance.
- the correspondence relationship between the characteristic curves A, B, and C and the values of the elements of the filter circuit 20 and the matching circuit 30 is as follows.
- the RFID device having the characteristic curve A can communicate in a frequency band of 13 MHz to 16.4 MHz (frequency band 3.4 MHz).
- the RFID device having the characteristic curve B can communicate in a frequency band of 12.7 MHz to 16.9 MHz (frequency band 4.2 MHz).
- the RFID device of the characteristic curve C which is a comparative example, can communicate in the frequency band of 13.6 MHz to 16 MHz (frequency band 2.4 MHz).
- the RFID device having the characteristic curve A has a relatively narrow bandwidth but a large communication limit distance, so that it can be used as an RFID device giving priority to the communication distance.
- FIG. 10 is a diagram illustrating a configuration of a filter circuit unit of the RFID device according to the second embodiment.
- FIG. 10A is a perspective view of the internal conductor layer seen through
- FIG. 10B is a perspective view of the enlarged display in the thickness direction.
- the first inductance element L1 is composed of a first multilayer coil element in which a plurality of loop-shaped conductors are stacked and helically wound inside the multilayer substrate MB.
- the second inductance element L2 is composed of a second laminated coil element in which a plurality of loop conductors are laminated and helically wound.
- Terminal electrodes P21A, P21B, P22A, and P22B are formed on the upper surface of the multilayer substrate MB.
- Terminal electrodes P11 and P12 are formed on the lower surface of the multilayer substrate MB. These terminal electrodes correspond to the portions indicated by the same reference numerals in the circuit shown in FIG.
- FIG. 11 is a perspective view schematically showing the arrangement relationship between the first inductance element L1 and the second inductance element L2 shown in FIG.
- the first inductance element L1 is composed of a first laminated coil element in which a plurality of loop-shaped conductors are laminated
- the second inductance element L2 is a second laminated coil element in which a plurality of loop-shaped conductors are laminated.
- the winding axis of the loop-shaped conductor of the first multilayer coil element and the winding axis of the loop-shaped conductor of the second multilayer coil element are overlapped on substantially the same straight line.
- the first laminated coil element and the second laminated coil element are laminated in a state of being wound individually.
- the two laminated coil elements may be laminated so as to be wound individually.
- the coupling coefficient k between the first inductance element L1 and the second inductance element L2 is about 0.7.
- FIG. 12 is a circuit diagram of the RFID module 103 according to the third embodiment.
- the RFID module 103 includes an RFID device 50 and a booster element 60.
- the RFIC element 10 is connected to the RFID device 50.
- the RFID device 50 includes a filter circuit 20, a matching circuit 30, and a coupling radiation element 40C.
- the filter circuit 20, the matching circuit 30, and the coupling radiating element 40C constitute the RFID device 50.
- the filter circuit 20 and the coupling radiating element 40C constitute the RFID device 50. Also good.
- the RFIC element 10 is composed of a semiconductor integrated circuit, and includes a first transmission terminal Tx1, a second transmission terminal Tx2, and a reception terminal Rx.
- the transmission signal is balanced and output at the first transmission terminal Tx1 and the second transmission terminal Tx2.
- the reception signal is input unbalanced at the reception terminal Rx.
- the first transmission terminal Tx1 and the second transmission terminal Tx2 correspond to a “first input / output terminal” and a “second input / output terminal” recited in the claims.
- the filter circuit 20 includes a first inductance element L1, a second inductance element L2, and a capacitor C1.
- the first end of the first inductance element L1 is connected to the first transmission terminal Tx1 of the RFIC element 10
- the first end of the second inductance element L2 is connected to the second transmission terminal Tx2 of the RFIC element 10
- the first inductance element The second ends of L1 and the second inductance element L2 are connected to both ends of the capacitor C1.
- the filter circuit 20 removes harmonic components contained in the transmission signal of the RFIC element 10.
- the matching circuit 30 includes capacitors C2, C3, and C4.
- the first end of the capacitor C2 is connected to the first output end of the filter circuit 20
- the first end of the capacitor C3 is connected to the second output end of the filter circuit 20
- the second ends of the capacitors C2 and C3 are connected to the capacitor C4. Connected to both ends.
- the coupling radiating element 40C is, for example, a loop coil conductor.
- the first inductance element L1 and the second inductance element L2 have the same inductance.
- the first inductance element L1 and the second inductance element L2 are magnetically coupled to each other so as to strengthen the magnetic flux.
- the coupling radiating element 40C is magnetically coupled to the booster element 60.
- the booster element 60 is combined with the coupling radiating element 40C and acts as a radiating element for the outside.
- This third embodiment is the same as the configuration of the RFID module 101 of the first embodiment except that the coupling radiating element 40C and the booster element 60 are provided.
- FIG. 13A is a plan view of the RFID device 50 shown in FIG. 12, and FIG. 13B is a sectional view thereof. However, the cross-sectional view of FIG. 13B shows the enlarged thickness direction.
- chip capacitors C1, C2, C3, C41, C42, and ESD protection elements E1, E2 are mounted on the upper surface of the multilayer substrate MB, respectively.
- the capacitors C1, C2, and C3 correspond to elements indicated by the same reference numerals in FIG.
- the capacitors C41 and C42 are connected in parallel and correspond to the capacitor C4 in FIG.
- the ESD protection elements E1 and E2 are disposed between the coupling radiation element 40C shown in FIG. 12 and the ground.
- the coupling radiating element 40C is laminated on the filter circuit 20 and the matching circuit 30.
- FIG. 14 is an exploded perspective view of the RFID module 103 using the RFID device 50.
- the RFID module 103 is configured by mounting the RFID device 50 on the booster element 60.
- the booster element 60 includes an insulating base 61 and a booster electrode 62 formed on the upper surface thereof.
- the booster electrode 62 is a “C” -shaped conductor film, and is disposed opposite to the coupling radiating element in the RFID device 50.
- the booster element 60 includes, in plan view, a conductor region that overlaps with the coupling radiating element, a conductor opening (non-conductor region) CA that overlaps with the coil opening of the coupling radiating element, and an outer edge of the conductor region and the conductor opening CA. And a slit portion SL connected to each other.
- a two-dot chain line in FIG. 14 indicates a region where the RFID device 50 is mounted.
- FIG. 15 is a diagram showing a current flowing through the coil conductor of the coupling radiating element 40C and a current flowing through the booster electrode 62 of the booster element 60, respectively. However, these currents are currents in a state where the coupling radiating element is stacked on the booster element 60.
- the coil conductor of the coupling radiating element 40C and the booster electrode 62 mainly couple the magnetic field electromagnetically.
- the current EC3 and the currents EC21 to EC25 contribute to radiation. That is, the coupling radiating element 40C and the booster element 60 act as an antenna.
- FIG. 16 is a diagram showing the relationship between the resonance frequency on the RFID tag side and the communication limit distance.
- the correspondence relationship between the characteristic curves A, B, and C and the values of the elements of the filter circuit 20 and the matching circuit 30 is as follows.
- the RFID device having the characteristic curve A can communicate in a frequency band of 13 MHz to 16.4 MHz (frequency band 3.4 MHz).
- the RFID device having the characteristic curve B can communicate in a frequency band of 12.7 MHz to 16.9 MHz (frequency band 4.2 MHz).
- the RFID device of the characteristic curve C which is a comparative example, can communicate in the frequency band of 13.6 MHz to 16 MHz (frequency band 2.4 MHz).
- the RFID device having the characteristic curve A has a relatively narrow bandwidth but a large communication limit distance, so that it can be used as an RFID device giving priority to the communication distance.
- FIG. 17 is an exploded perspective view of the RFID module 104 according to the fourth embodiment.
- the RFID module 104 includes a booster element 70 and an RFID device 50.
- the booster element 70 includes an insulating base 71, a booster coil pattern 72 formed on the upper surface thereof, and a booster coil pattern 73 formed on the lower surface.
- the booster coil patterns 72 and 73 are also illustrated in a state separated from the insulating base 71.
- the RFID device 50 is the same as that shown in the third embodiment.
- the RFID device 50 is mounted on the insulating base 71 so that the coil of the coupling radiating element incorporated in the RFID device 50 and the booster coil patterns 72 and 73 are magnetically coupled.
- you may comprise a booster element with a conductor coil pattern.
- FIGS. 18A and 18B are diagrams showing two configurations of the RFID device according to the fifth embodiment.
- the coupling radiating element 40C is arranged in a positional relationship overlapping the filter circuit 20 and the matching circuit 30 in the multilayer substrate in plan view.
- the coupling radiating element 40C is arranged on the side of the filter circuit 20 and the matching circuit 30.
- the loop surface of the coupling radiating element 40C is arranged in parallel to the plane of the multilayer substrate.
- the coil axis direction of the coupling radiating element 40C is arranged in parallel to the plane of the multilayer substrate.
- the coupling radiating element 40C may be formed on the side of the filter circuit 20 and the matching circuit 30.
- each of the embodiments described above an example in which the plurality of loop conductors are quadrangular or elliptical (oval) in plan view is shown, but the plurality of loop conductors are circular or octagonal in plan view. Or other polygonal shape may be sufficient.
- Each layer of the multilayer substrate may be a non-magnetic dielectric layer as necessary.
- the booster element 60 is used as an antenna
- the booster element 70 is used as an antenna. It is also possible to provide this radiating conductor together with the booster element as an antenna.
- the matching circuit may be constituted by not only the capacitance element but also only the inductance element or the capacitance element and the inductance element as necessary.
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Abstract
Description
図2は第1の実施形態に係るRFIDモジュール101の回路図である。このRFIDモジュール101は、RFIC素子10、フィルタ回路20、整合回路30、および放射素子40を備えている。また、フィルタ回路20と整合回路30とでRFIDデバイス50を構成している。
放射素子40は例えばループ状コイルアンテナである。
L=L10+L20+2M
=L10+L20+2k×√(L10*L20)
L1=L2=L/2
で表される。
L1,L2:800nH
C1:65pF
C2,C3:18pF
特性曲線[B]
L1,L2:800nH
C1:65pF
C2,C3:23pF
特性曲線[C]
L1,L2:560nH
C1:90pF
C2,C3:18pF
75mm以内の通信距離範囲で通信することを条件にすると、特性曲線AのRFIDデバイスは、周波数帯域が13MHz~16.4MHz(周波数帯域3.4MHz)の範囲で通信できる。また、特性曲線BのRFIDデバイスは、周波数帯域が12.7MHz~16.9MHz(周波数帯域4.2MHz)の範囲で通信できる。比較例である特性曲線CのRFIDデバイスは、周波数帯域が13.6MHz~16MHz(周波数帯域2.4MHz)の範囲で通信できる。
図10は第2の実施形態に係るRFIDデバイスのフィルタ回路部の構成を示す図である。図10(A)は内部導体層を透視した斜視図、図10(B)はそれを厚み方向に拡大表示した斜視図である。図10(B)に表れているように、多層基板MBの内部に、複数のループ状導体が積層されてヘリカル状に巻回された第1の積層型コイル素子で第1インダクタンス素子L1が構成され、複数のループ状導体が積層されてヘリカル状に巻回された第2の積層型コイル素子で第2インダクタンス素子L2が構成されている。
第1インダクタンス素子L1は、複数のループ状導体が積層された第1の積層型コイル素子で構成され、第2インダクタンス素子L2は、複数のループ状導体が積層された第2の積層型コイル素子で構成され、第1の積層型コイル素子のループ状導体の巻回軸および第2の積層型コイル素子のループ状導体の巻回軸はほぼ同一直線上に重なっている。但し、図3に示した例と異なり、前記第1の積層型コイル素子と第2の積層型コイル素子は個別に巻回した状態で積層されている。
・第1の積層型コイル素子を構成するループ状導体のループ面と第2の積層型コイル素子を構成するループ状導体のループ面の対向面積率を大きくする。
・磁性体層の厚みを薄くする(隣接するループ状導体の間隔を狭くする)。
・透磁率の大きな磁性体層を用いる。
ことが有効である。
図12は第3の実施形態に係るRFIDモジュール103の回路図である。RFIDモジュール103は、RFIDデバイス50とブースター素子60とで構成されている。RFIDデバイス50にはRFIC素子10が接続される。
結合用放射素子40Cは例えばループ状コイル導体である。
L1,L2:800nH
C1:65pF
C2,C3:18pF
特性曲線[B]
L1,L2:800nH
C1:65pF
C2,C3:23pF
特性曲線[C]
L1,L2:560nH
C1:90pF
C2,C3:18pF
85mm以内の通信距離範囲で通信することを条件にすると、特性曲線AのRFIDデバイスは、周波数帯域が13MHz~16.4MHz(周波数帯域3.4MHz)の範囲で通信できる。また、特性曲線BのRFIDデバイスは、周波数帯域が12.7MHz~16.9MHz(周波数帯域4.2MHz)の範囲で通信できる。比較例である特性曲線CのRFIDデバイスは、周波数帯域が13.6MHz~16MHz(周波数帯域2.4MHz)の範囲で通信できる。
図17は第4の実施形態に係るRFIDモジュール104の分解斜視図である。このRFIDモジュール104は、ブースター素子70とRFIDデバイス50とで構成されている。ブースター素子70は、絶縁基材71、その上面に形成されたブースターコイルパターン72および下面に形成されたブースターコイルパターン73で構成されている。図17においては、ブースターコイルパターン72,73についても絶縁基材71から分離した状態で図示している。
このように導体コイルパターンでブースター素子を構成してもよい。
第5の実施形態では、結合用放射素子40Cの別の構成例を示す。図18(A)、図18(B)は第5の実施形態に係るRFIDデバイスの二つの構成を示す図である。第3の実施形態では、平面視で、多層基板内にフィルタ回路20および整合回路30と重なる位置関係に結合用放射素子40Cを配置した。図18(A)、図18(B)の例では、フィルタ回路20および整合回路30の側方に結合用放射素子40Cを配置している。図18(A)の例では、結合用放射素子40Cのループ面を多層基板の平面に対して平行に配置している。図18(B)の例では、結合用放射素子40Cのコイル軸方向を多層基板の平面に対して平行に配置している。
以上に示した各実施形態では、複数のループ状導体が平面視で四角形または楕円形(長円形)である例を示したが、複数のループ状導体は平面視で円形や八角形であってもよいし、他の多角形状であってもよい。
また、多層基板の各層は必要に応じて非磁性体の誘電体層であってもよい。
C41,C42…コンデンサ
CA…導体開口部
E1,E2…ESD保護素子
L1…第1のインダクタンス素子
L2…第2のインダクタンス素子
MB…多層基板
P11,P12…端子電極
P21A,P21B,P22A,P22B…端子電極
Rx…受信端子
SL…スリット部
Tx1,Tx2…送信端子
10…RFIC素子
20…フィルタ回路
30…整合回路
40…放射素子
40C…結合用放射素子
50…RFIDデバイス
60,70…ブースター素子
61,71…絶縁基材
62…ブースター電極
72,73…ブースターコイルパターン
101~104…RFIDモジュール
Claims (12)
- 第1入出力端子および第2入出力端子を有するRFIC素子と、
前記第1入出力端子に接続された第1インダクタンス素子、および、前記第2入出力端子に接続されたた第2インダクタンス素子を含んで構成され、前記RFIC素子の高調波成分を除去するためのフィルタ回路と、
前記フィルタ回路に接続された放射素子と、を有し、
前記第1インダクタンス素子と前記第2インダクタンス素子とは、互いに磁気結合していることを特徴とするRFIDモジュール。 - 前記第1インダクタンス素子と前記第2インダクタンス素子との結合係数は0.7以上である、請求項1に記載のRFIDモジュール。
- 前記フィルタ回路と前記放射素子との間に接続され、インダクタンス素子およびキャパシタンス素子、またはインダクタンス素子もしくはキャパシタンス素子を含んで構成される整合回路を備えた、請求項1または2に記載のRFIDモジュール。
- 前記第1インダクタンス素子は、複数のループ状導体が積層された第1の積層型コイル素子で構成され、前記第2インダクタンス素子は、複数のループ状導体が積層された第2の積層型コイル素子で構成され、前記第1の積層型コイル素子のループ状導体の巻回軸および前記第2の積層型コイル素子のループ状導体の巻回軸はほぼ同一直線上に重なっている、請求項1~3のいずれかに記載のRFIDモジュール。
- 前記第1の積層型コイル素子の前記ループ状導体と前記第2の積層型コイル素子の前記ループ状導体とは交互に積層されている、請求項4に記載のRFIDモジュール。
- 前記第1インダクタンス素子および前記第2インダクタンス素子は、複数の磁性体層を積層してなる多層基板に内蔵されている、請求項1~5のいずれかに記載のRFIDモジュール。
- 前記整合回路の前記インダクタンス素子または前記キャパシタンス素子は、前記多層基板の表面に搭載されている、請求項6に記載のRFIDモジュール。
- 前記放射素子に電磁界を介して結合されて無線信号の受信または送信を行うブースター素子をさらに備えた、請求項1~7のいずれかに記載のRFIDモジュール。
- 前記放射素子はコイル状導体で構成され、このコイル状導体と前記ブースター素子とは互いに電磁界結合している、請求項8に記載のRFIDモジュール。
- 前記放射素子は前記多層基板に内蔵されている、請求項8または9に記載のRFIDモジュール。
- 第1入出力端子および第2入出力端子を有するRFIC素子と、放射素子との間に設けられるRFIDデバイスであって、
前記第1入出力端子に接続された第1インダクタンス素子、および、前記第2入出力端子に接続されたた第2インダクタンス素子を含んで構成され、前記RFIC素子の高調波成分を除去するためのフィルタ回路を有し、前記第1インダクタンス素子と前記第2インダクタンス素子とは、互いに磁気結合していることを特徴とするRFIDデバイス。 - 前記フィルタ回路の前記放射素子側に接続され、インダクタンス素子およびキャパシタンス素子、またはインダクタンス素子もしくはキャパシタンス素子を含んで構成される整合回路を備えた、請求項11に記載のRFIDデバイス。
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| JP2011552116A JP5062372B2 (ja) | 2010-09-06 | 2011-08-31 | Rfidモジュールおよびrfidデバイス |
| CN2011800164415A CN102823146A (zh) | 2010-09-06 | 2011-08-31 | Rfid模块及rfid器件 |
| GB1214216.2A GB2496713A (en) | 2010-09-06 | 2011-08-31 | RFID module and RFID device |
| US13/603,627 US20120325916A1 (en) | 2010-09-06 | 2012-09-05 | Rfid module and rfid device |
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| CN107710628A (zh) * | 2015-07-03 | 2018-02-16 | 株式会社村田制作所 | 前端模块 |
| WO2018101285A1 (ja) * | 2016-11-29 | 2018-06-07 | 株式会社村田製作所 | 磁界結合素子、アンテナ装置および電子機器 |
| JP2019009769A (ja) * | 2017-06-26 | 2019-01-17 | 株式会社村田製作所 | 弾性波装置 |
| JPWO2019017098A1 (ja) * | 2017-07-21 | 2019-11-21 | 株式会社村田製作所 | アンテナ結合素子、アンテナ装置および電子機器 |
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| WO2011118379A1 (ja) * | 2010-03-24 | 2011-09-29 | 株式会社村田製作所 | Rfidシステム |
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| CN107623879A (zh) * | 2017-08-31 | 2018-01-23 | 苏州惠华电子科技有限公司 | 一种基于ad/dc转换电路的rfid电子配线架 |
| CN111293952B (zh) * | 2020-02-27 | 2023-04-18 | 桂林电子科技大学 | 一种基于电感率模型的开关磁阻电机转矩控制系统和方法 |
| CN112802838B (zh) * | 2020-12-29 | 2023-04-28 | 长沙理工大学 | 一种宽带esd保护电路 |
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Also Published As
| Publication number | Publication date |
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| US20120325916A1 (en) | 2012-12-27 |
| GB201214216D0 (en) | 2012-09-19 |
| GB2496713A (en) | 2013-05-22 |
| JPWO2012032974A1 (ja) | 2014-01-20 |
| JP5062372B2 (ja) | 2012-10-31 |
| CN102823146A (zh) | 2012-12-12 |
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