WO2021157402A1 - Circuit d'adaptation d'antenne - Google Patents

Circuit d'adaptation d'antenne Download PDF

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Publication number
WO2021157402A1
WO2021157402A1 PCT/JP2021/002410 JP2021002410W WO2021157402A1 WO 2021157402 A1 WO2021157402 A1 WO 2021157402A1 JP 2021002410 W JP2021002410 W JP 2021002410W WO 2021157402 A1 WO2021157402 A1 WO 2021157402A1
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WIPO (PCT)
Prior art keywords
terminal
inductor
matching circuit
antenna matching
connection state
Prior art date
Application number
PCT/JP2021/002410
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English (en)
Japanese (ja)
Inventor
喜代美 池本
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株式会社村田製作所
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Filing date
Publication date
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Publication of WO2021157402A1 publication Critical patent/WO2021157402A1/fr

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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
    • 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 antenna matching circuit.
  • the antenna matching circuit is provided to match the impedance between the antenna and the feeding circuit.
  • the antenna matching circuit is composed of, for example, a combination of a plurality of inductors and a plurality of capacitors. The combination of multiple inductors and multiple capacitors is adjusted according to the required frequency and antenna characteristics.
  • Patent Document 1 describes a variable inductor capable of changing the inductance value.
  • Patent Document 2 describes an antenna device using a variable inductor.
  • a variable inductor is configured by utilizing the coupling of inductors.
  • each terminal of a plurality of inductors is connected to any one of a ground, a capacitor, a resistance element, and the like. Therefore, in the antenna matching circuit using the variable inductors of Patent Documents 1 and 2, when matching at a plurality of frequencies with one antenna, the number of parts connected to the plurality of inductors increases. Therefore, a large area for mounting the components is required, and the number of wirings connecting them may increase.
  • An object of the present invention is to provide an antenna matching circuit capable of matching at a plurality of frequencies and being miniaturized.
  • the antenna matching circuit on one aspect of the present invention includes an antenna, a first inductor connected to the antenna, a second inductor that forms a mutual inductance between the first inductor, the first inductor, and the first inductor. It has a plurality of terminals electrically connected to both ends of each of the two inductors, at least two of the terminals, and a switch for switching the connection state with the first reference potential. Of the terminals, the terminal that is not connected to the first reference potential is in an open state.
  • the antenna matching circuit of the present invention matching at a plurality of frequencies can be achieved and miniaturization is possible.
  • FIG. 1 is a circuit diagram schematically showing an antenna matching circuit according to the first embodiment.
  • FIG. 2 is an equivalent circuit diagram schematically showing a first connection state of the antenna matching circuit according to the first embodiment.
  • FIG. 3 is an equivalent circuit diagram schematically showing a second connection state of the antenna matching circuit according to the first embodiment.
  • FIG. 4 is an equivalent circuit diagram schematically showing a third connection state of the antenna matching circuit according to the first embodiment.
  • FIG. 5 is an equivalent circuit diagram schematically showing a fourth connection state of the antenna matching circuit according to the first embodiment.
  • FIG. 6 is a graph showing the relationship between the reflection coefficient and the frequency for each different connection state of the antenna matching circuit according to the first embodiment.
  • FIG. 7 is a circuit diagram schematically showing an antenna matching circuit according to the second embodiment.
  • FIG. 8 is an equivalent circuit diagram schematically showing a first connection state of the antenna matching circuit according to the second embodiment.
  • FIG. 9 is an equivalent circuit diagram schematically showing a second connection state of the antenna matching circuit according to the second embodiment.
  • FIG. 10 is an equivalent circuit diagram schematically showing a third connection state of the antenna matching circuit according to the second embodiment.
  • FIG. 11 is an equivalent circuit diagram schematically showing a fourth connection state of the antenna matching circuit according to the second embodiment.
  • FIG. 12 is an equivalent circuit diagram schematically showing a fifth connection state of the antenna matching circuit according to the second embodiment.
  • FIG. 13 is an equivalent circuit diagram schematically showing a sixth connection state of the antenna matching circuit according to the second embodiment.
  • FIG. 14 is a graph showing the relationship between the reflection coefficient and the frequency for each different connection state of the antenna matching circuit according to the second embodiment.
  • FIG. 15 is a circuit diagram schematically showing an antenna matching circuit according to a third embodiment.
  • FIG. 16 is an equivalent circuit diagram schematically showing a first connection state of the antenna matching circuit according to the third embodiment.
  • FIG. 17 is an equivalent circuit diagram schematically showing a second connection state of the antenna matching circuit according to the third embodiment.
  • FIG. 18 is an equivalent circuit diagram schematically showing a third connection state of the antenna matching circuit according to the third embodiment.
  • FIG. 19 is an equivalent circuit diagram schematically showing a fourth connection state of the antenna matching circuit according to the third embodiment.
  • FIG. 1 is a circuit diagram schematically showing an antenna matching circuit according to the first embodiment.
  • the antenna matching circuit 1 includes an antenna 10, a common mode choke coil 20, a switch 30, and a control circuit 40.
  • the antenna matching circuit 1 is a circuit for performing impedance matching of the antenna 10.
  • the antenna 10 is mounted on, for example, a mobile terminal such as a mobile phone, a smartphone or a tablet terminal, a personal computer having a communication function, or the like.
  • the antenna 10 transmits and receives a signal in a frequency band of 0.6 GHz or more and 6 GHz or less.
  • the common mode choke coil 20 has a first inductor 21 and a second inductor 22 that are magnetically coupled to each other. That is, a mutual inductance is formed between the first inductor 21 and the second inductor 22.
  • the first inductor 21 is connected to the antenna 10. Specifically, one end of the first inductor 21 is electrically connected to the first terminal T1, and the other end is electrically connected to the second terminal T2. The first inductor 21 is electrically connected to the antenna 10 via the first terminal T1. Further, one end side of the second inductor 22 is electrically connected to the third terminal T3, and the other end side is electrically connected to the fourth terminal T4.
  • the common mode choke coil 20 of this embodiment has four terminals. However, the present invention is not limited to this, and the common mode choke coil 20 may have five or more terminals.
  • the common mode choke coil 20 may have any configuration, but for example, it is desirable that the first inductor 21 and the second inductor 22 are integrated common mode choke coils 20.
  • the integrated type has, for example, a configuration in which a coil forming the first inductor 21 and a coil forming the second inductor 22 are wound around a common core (for example, a ferrite core) made of a magnetic material.
  • the common mode choke coil 20 is not limited to the integrated type, and may have a configuration in which each inductor is magnetically coupled.
  • each inductor may be formed in an individual divided core, or may be composed of a flat coil.
  • the switch 30 is an element that switches the connection state between at least two terminals of the plurality of terminals (first terminal T1 to fourth terminal T4) of the common mode choke coil 20 and the first reference potential 50.
  • the switch 30 has switch-side terminals TS1, TS2, TS3, and TS4 provided corresponding to the first terminal T1 to the fourth terminal T4, respectively.
  • the switch 30 connects one of the switch-side terminals TS1, TS2, TS3, and TS4 to the first reference potential 50 based on the control signal Si supplied from the control circuit 40.
  • one of the first terminal T1 to the fourth terminal T4 is electrically connected to the first reference potential 50 by the operation of the switch 30.
  • the terminal that is not connected to the first reference potential 50 is in the open state. That is, the switch-side terminal that is not connected to the first reference potential 50 is not connected to any other wiring, element, or the like. As a result, due to the operation of the switch 30, the terminal of the first terminal T1 to the fourth terminal T4 that is not connected to the first reference potential 50 is opened.
  • the switch 30 is, for example, a semiconductor switch.
  • the semiconductor switch is, for example, a FET (Field Effect Transistor).
  • the control circuit 40 is configured as, for example, an IC (Integrated Circuit).
  • the control circuit 40 may be included in an RFIC (Radio Frequency Integrated Circuit) that controls transmission / reception of the antenna 10.
  • the first reference potential 50 may be a fixed potential, for example, a ground potential. Specifically, the first reference potential 50 is the ground of the substrate on which the antenna matching circuit 1 is mounted or the ground of the housing.
  • FIG. 2 is an equivalent circuit diagram schematically showing a first connection state of the antenna matching circuit according to the first embodiment.
  • the first terminal T1 of the first terminal T1 to the fourth terminal T4 is electrically connected to the first reference potential 50 by the operation of the switch 30.
  • the second terminal T2, the third terminal T3, and the fourth terminal T4, which are not connected to the first reference potential 50 are in an open state.
  • the second terminal T2, the third terminal T3, and the fourth terminal T4 are respectively connected to the second reference potential 51 via the parasitic capacitance Cs.
  • the second terminal T2, the third terminal T3, and the fourth terminal T4 are equivalently capacitively connected and function as a circuit.
  • the parasitic capacitance Cs is a capacitance component formed between the coil forming the first inductor 21 and the second inductor 22 and another conductor.
  • Other conductors are, for example, electrodes and wiring provided on a substrate on which the common mode choke coil 20 is mounted, or parts and housings of a communication device in which the antenna matching circuit 1 is incorporated.
  • the second reference potential 51 may be a ground having the same potential as the first reference potential 50, or may be a potential different from the first reference potential 50.
  • FIG. 3 is an equivalent circuit diagram schematically showing a second connection state of the antenna matching circuit according to the first embodiment.
  • the second terminal T2 of the first terminal T1 to the fourth terminal T4 is electrically connected to the first reference potential 50 by the operation of the switch 30.
  • the first terminal T1, the third terminal T3, and the fourth terminal T4, which are not connected to the first reference potential 50 are in an open state.
  • the first terminal T1, the third terminal T3, and the fourth terminal T4 are respectively connected to the second reference potential 51 via the parasitic capacitance Cs.
  • the first terminal T1, the third terminal T3, and the fourth terminal T4 are equivalently capacitively connected and function as a circuit.
  • FIG. 4 is an equivalent circuit diagram schematically showing a third connection state of the antenna matching circuit according to the first embodiment.
  • the third terminal T3 of the first terminal T1 to the fourth terminal T4 is electrically connected to the first reference potential 50 by the operation of the switch 30.
  • the first terminal T1, the second terminal T2, and the fourth terminal T4 which are not connected to the first reference potential 50, are in an open state.
  • the first terminal T1, the second terminal T2 and the fourth terminal T4 are respectively connected to the second reference potential 51 via the parasitic capacitance Cs.
  • the first terminal T1, the second terminal T2, and the fourth terminal T4 are equivalently capacitively connected and function as a circuit.
  • FIG. 5 is an equivalent circuit diagram schematically showing a fourth connection state of the antenna matching circuit according to the first embodiment.
  • the fourth terminal T4 of the first terminal T1 to the fourth terminal T4 is electrically connected to the first reference potential 50 by the operation of the switch 30.
  • the first terminal T1, the second terminal T2, and the third terminal T3, which are not connected to the first reference potential 50 are in an open state.
  • the first terminal T1, the second terminal T2 and the third terminal T3 are respectively connected to the second reference potential 51 via the parasitic capacitance Cs.
  • the first terminal T1, the second terminal T2, and the third terminal T3 are equivalently capacitively connected and function as a circuit.
  • the antenna matching circuit 1 has a plurality of terminals of the first inductor 21 and the second inductor 22 and a first reference by the operation of the switch 30 according to the frequency and characteristics of the antenna 10.
  • the connection state with the potential 50 can be switched.
  • the antenna matching circuit 1 can be switched to four types of connection states by one common mode choke coil 20.
  • the coupling state (direction of the magnetic field) between the first inductor 21 and the second inductor 22 of the common mode choke coil 20 changes.
  • the antenna matching circuit 1 can change the impedance by utilizing the mutual inductance of the common mode and the differential mode.
  • the terminals in the unconnected state are in the open state, and there is no need to connect them to elements (capacitors, inductors, etc.) for changing impedance. Further, the terminals in the unconnected state are equivalently connected to the second reference potential 51 via the parasitic capacitance Cs. That is, it is not necessary to provide wiring or the like for connecting the terminal in the non-connected state and the second reference potential 51. Therefore, the antenna matching circuit 1 can be miniaturized.
  • FIG. 6 is a graph showing the relationship between the reflection coefficient and the frequency for each different connection state of the antenna matching circuit according to the first embodiment.
  • the vertical axis shows S11 (reflection coefficient) of the S parameter
  • the horizontal axis shows the frequency.
  • the resonance frequency is different in each of the first connection state M1 to the fourth connection state M4.
  • the resonance frequencies of the antenna matching circuit 1 are around 9 GHz and 11 GHz.
  • the resonance frequency of the antenna matching circuit 1 is around 10 GHz.
  • the resonance frequency of the antenna matching circuit 1 is around 9 GHz.
  • the resonance frequency of the antenna matching circuit 1 is around 3 GHz.
  • the resonance frequency of the antenna matching circuit 1 can be changed by switching the connection state of the first inductor 21, the second inductor 22, and the first reference potential 50.
  • the antenna matching circuit 1 can realize a plurality of different antenna characteristics with one common mode choke coil 20.
  • the antenna matching circuit 1 may be provided with a capacitor element, an inductor element, a resistance element, etc., depending on the characteristics required for the antenna 10, or a filter, an amplifier, or the like used for transmission / reception of the antenna 10 is connected. You may be.
  • the present invention is not limited to this. That is, the switch 30 can perform impedance matching as long as the connection state of at least two of the four terminals can be switched. In this case, one or two of the four terminals can be left open without being connected to the first reference potential 50 in any of the connected states. In other words, the antenna matching circuit 1 only needs to be able to switch at least two connection states from the first connection state M1 to the fourth connection state M4.
  • the antenna matching circuit 1 of the present embodiment includes the antenna 10, the first inductor 21 connected to the antenna 10, and the second inductor 22 that forms a mutual inductance between the first inductor 21.
  • a plurality of terminals (first terminal T1 to fourth terminal T4) electrically connected to both ends of the first inductor 21 and the second inductor 22, at least two of the plurality of terminals, and a first terminal. It has a switch 30 for switching the connection state with the reference potential 50. Of the plurality of terminals, the terminal that is not connected to the first reference potential 50 is in the open state.
  • FIG. 7 is a circuit diagram schematically showing an antenna matching circuit according to the second embodiment.
  • the common mode choke coil 20A further includes the third inductor 23 will be described.
  • the common mode choke coil 20A of the antenna matching circuit 1A further has a third inductor 23 and two terminals (fifth) electrically connected to both ends of the third inductor 23. It has a terminal T5 and a sixth terminal T6).
  • the third inductor 23 forms a mutual inductance with at least one of the first inductor 21 and the second inductor 22.
  • the third inductor 23 of the present embodiment is formed as a common mode choke coil 20A integrated with the first inductor 21 and the second inductor 22. That is, the common mode choke coil 20A is configured by winding the coils forming the first inductor 21, the second inductor 22, and the third inductor 23 around a common core.
  • the switch 30A has switch-side terminals TS1, TS2, TS3, TS4, TS5, and TS6 provided corresponding to the first terminal T1 to the sixth terminal T6, respectively.
  • the switch 30A connects one of the switch-side terminals TS1, TS2, TS3, TS4, TS5, and TS6 with the first reference potential 50 based on the control signal Si supplied from the control circuit 40. ..
  • one of the first terminal T1 to the sixth terminal T6 is electrically connected to the first reference potential 50 by the operation of the switch 30A.
  • the switch 30A of the present embodiment switches the connection state between the six terminals including the two terminals (fifth terminal T5 and sixth terminal T6) of the third inductor 23 and the first reference potential 50.
  • the terminal that is not connected to the first reference potential 50 is in the open state. That is, by the operation of the switch 30A, the terminal of the first terminal T1 to the sixth terminal T6 that is not connected to the first reference potential 50 is opened.
  • FIG. 8 is an equivalent circuit diagram schematically showing the first connection state of the antenna matching circuit according to the second embodiment.
  • the first terminal T1 of the first terminal T1 to the sixth terminal T6 is electrically connected to the first reference potential 50 by the operation of the switch 30A.
  • the second terminal T2 to the sixth terminal T6 which are not connected to the first reference potential 50 are in an open state.
  • the second terminal T2 to the sixth terminal T6 are connected to the second reference potential 51 via the parasitic capacitance Cs, respectively.
  • the second terminal T2 to the sixth terminal T6 are equivalently connected by capacitance and function as a circuit.
  • FIG. 9 is an equivalent circuit diagram schematically showing a second connection state of the antenna matching circuit according to the second embodiment.
  • the second terminal T2 of the first terminal T1 to the sixth terminal T6 is electrically connected to the first reference potential 50 by the operation of the switch 30A.
  • the first terminal T1 and the third terminal T3 to the sixth terminal T6 which are not connected to the first reference potential 50 are in an open state.
  • the first terminal T1 and the third terminal T3 to the sixth terminal T6 are respectively connected to the second reference potential 51 via the parasitic capacitance Cs.
  • the first terminal T1 and the third terminal T3 to the sixth terminal T6 are equivalently connected by capacitance and function as a circuit.
  • FIG. 10 is an equivalent circuit diagram schematically showing a third connection state of the antenna matching circuit according to the second embodiment.
  • the third terminal T3 of the first terminal T1 to the sixth terminal T6 is electrically connected to the first reference potential 50 by the operation of the switch 30A.
  • the first terminal T1, the second terminal T2, the fourth terminal T4, the fifth terminal T5, and the sixth terminal T6, which are not connected to the first reference potential 50 are It is in an open state.
  • the first terminal T1, the second terminal T2, the fourth terminal T4, the fifth terminal T5, and the sixth terminal T6 are respectively via the parasitic capacitance Cs. It is connected to the second reference potential 51.
  • the first terminal T1, the second terminal T2, the fourth terminal T4, the fifth terminal T5, and the sixth terminal T6 are equally capacitively connected and function as a circuit.
  • FIG. 11 is an equivalent circuit diagram schematically showing a fourth connection state of the antenna matching circuit according to the second embodiment.
  • the fourth terminal T4 of the first terminal T1 to the sixth terminal T6 is electrically connected to the first reference potential 50 by the operation of the switch 30A.
  • the first terminal T1, the second terminal T2, the third terminal T3, the fifth terminal T5, and the sixth terminal T6, which are not connected to the first reference potential 50 are It is in an open state.
  • the first terminal T1, the second terminal T2, the third terminal T3, the fifth terminal T5, and the sixth terminal T6 are respectively via the parasitic capacitance Cs. It is connected to the second reference potential 51.
  • the first terminal T1, the second terminal T2, the third terminal T3, the fifth terminal T5, and the sixth terminal T6 are equally capacitively connected and function as a circuit.
  • FIG. 12 is an equivalent circuit diagram schematically showing a fifth connection state of the antenna matching circuit according to the second embodiment.
  • the fifth terminal T5 of the first terminal T1 to the sixth terminal T6 is electrically connected to the first reference potential 50 by the operation of the switch 30A.
  • the first terminal T1 to the sixth terminal T6 which are not connected to the first reference potential 50 are in an open state.
  • the first terminal T1 to the fourth terminal T4 and the sixth terminal T6 are respectively connected to the second reference potential 51 via the parasitic capacitance Cs.
  • the first terminal T1 to the fourth terminal T4 and the sixth terminal T6 are equivalently connected by capacitance and function as a circuit.
  • FIG. 13 is an equivalent circuit diagram schematically showing a sixth connection state of the antenna matching circuit according to the second embodiment.
  • the sixth terminal T6 of the first terminal T1 to the sixth terminal T6 is electrically connected to the first reference potential 50 by the operation of the switch 30A.
  • the first terminal T1 to the sixth terminal T6 which are not connected to the first reference potential 50 are in an open state.
  • the first terminal T1 to the fifth terminal T5 are respectively connected to the second reference potential 51 via the parasitic capacitance Cs.
  • the first terminal T1 to the fifth terminal T5 are equally capacitively connected and function as a circuit.
  • connection state of the first inductor 21, the second inductor 22, the third inductor 23 and the first reference potential 50 is switched by the operation of the switch 30A.
  • the antenna matching circuit 1A has more connection states than the above-described first embodiment, and can appropriately switch the frequency according to the antenna characteristics.
  • FIG. 14 is a graph showing the relationship between the reflection coefficient and the frequency for each different connection state of the antenna matching circuit according to the second embodiment.
  • the resonance frequency is different in each of the first connection state M1 to the sixth connection state M6.
  • the resonance frequency of the antenna matching circuit 1A is around 2.8 GHz.
  • the resonance frequency of the antenna matching circuit 1A is around 6.5 GHz.
  • the resonance frequency of the antenna matching circuit 1A is around 4.4 GHz.
  • the resonance frequency of the antenna matching circuit 1A is around 3.9 GHz.
  • the resonance frequency of the antenna matching circuit 1A is around 7.2 GHz.
  • the resonance frequency of the antenna matching circuit 1A is around 4.5 GHz.
  • the resonance frequency of the antenna matching circuit 1A can be changed by switching the connection state of the first inductor 21, the second inductor 22, the third inductor 23, and the first reference potential 50.
  • the antenna matching circuit 1A can realize a plurality of different antenna characteristics with one common mode choke coil 20A.
  • the second embodiment is not limited to the case of switching the connection state between the six terminals of the common mode choke coil 20A and the first reference potential 50. That is, the switch 30A can perform impedance matching as long as the connection state of at least two of the six terminals can be switched.
  • FIG. 15 is a circuit diagram schematically showing an antenna matching circuit according to a third embodiment.
  • the third embodiment unlike the first embodiment and the second embodiment described above, a configuration in which the fourth inductor 24 is provided and the fourth inductor 24 is connected in series with the first inductor 21 will be described.
  • the first inductor 21 and the fourth inductor 24 are connected in series between the first terminal T1 and the second terminal T2. ..
  • One end side of the first inductor 21 is electrically connected to the first terminal T1
  • the other end side of the first inductor 21 is electrically connected to one end side of the fourth inductor 24.
  • the other end side of the fourth inductor 24 is electrically connected to the second terminal T2.
  • the common mode choke coil 20B has four terminals as in the first embodiment described above, but the inductance values between the first terminal T1 and the second terminal T2 are different.
  • the switch 30B switches the connection state between one terminal of the first terminal T1 to the fourth terminal T4 and the first reference potential 50 in the same manner as in the first embodiment described above.
  • FIG. 16 is an equivalent circuit diagram schematically showing a first connection state of the antenna matching circuit according to the third embodiment.
  • FIG. 17 is an equivalent circuit diagram schematically showing a second connection state of the antenna matching circuit according to the third embodiment.
  • FIG. 18 is an equivalent circuit diagram schematically showing a third connection state of the antenna matching circuit according to the third embodiment.
  • FIG. 19 is an equivalent circuit diagram schematically showing a fourth connection state of the antenna matching circuit according to the third embodiment.
  • each of the first connection state M1 to the fourth connection state M4 has four terminals, a first reference potential 50, a second reference potential 51, and a parasitic capacitance Cs.
  • the connection configuration with and from is the same as that of the first embodiment shown in FIGS. 2 to 5. That is, the antenna matching circuit 1B can be switched to four types of connection states by one common mode choke coil 20B.
  • the first inductor 21 and the fourth inductor 24 are connected in series between the first terminal T1 and the second terminal T2, the first inductor 21, the second inductor 22, and the fourth inductor 24
  • the binding state is different from that of the first embodiment.
  • the third embodiment it is possible to realize a frequency characteristic different from that of the first embodiment.
  • the number of terminals in the above-mentioned common mode choke coils 20, 20A and 20B is not limited to 4 or 6.
  • the number of terminals may be 7 or more.
  • Antenna matching circuit 10 Antenna 20, 20A, 20B Common mode choke coil 21 1st inductor 22 2nd inductor 23 3rd inductor 24 4th inductor 30, 30A, 30B Switch 40
  • Control circuit 50 1st reference potential 51 2nd reference potential Cs parasitic capacitance M1 1st connection state M2 2nd connection state M3 3rd connection state M4 4th connection state M5 5th connection state M6 6th connection state T1 1st terminal T2 2nd terminal T3 3rd terminal T4 4th terminal T5 5th terminal T6 6th terminal TS1, TS2, TS3, TS4 Switch side terminal

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Abstract

Un circuit d'adaptation d'antenne selon la présente invention comprend : une antenne ; une première bobine d'induction qui est connectée à l'antenne ; une seconde bobine d'induction qui forme une inductance mutuelle avec la première bobine d'induction ; une pluralité de bornes qui sont électriquement connectées à des extrémités respectives de la première bobine d'induction et de la seconde bobine d'induction ; et un commutateur qui commute des états connectés entre un premier potentiel de référence et au moins deux de la pluralité de bornes, les bornes de la pluralité de bornes qui sont dans un état non connecté au premier potentiel de référence étant dans un état ouvert.
PCT/JP2021/002410 2020-02-07 2021-01-25 Circuit d'adaptation d'antenne WO2021157402A1 (fr)

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JP2020020159 2020-02-07
JP2020-020159 2020-02-07

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WO2021157402A1 true WO2021157402A1 (fr) 2021-08-12

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0457765U (fr) * 1990-09-26 1992-05-18
JP3021857U (ja) * 1995-08-23 1996-03-12 有限会社今井電機製作所 短縮型垂直，水平アンテナ整合装置
WO2017065142A1 (fr) * 2015-10-16 2017-04-20 株式会社村田製作所 Circuit d'antenne et dispositif de communication
WO2020005231A1 (fr) * 2018-06-27 2020-01-02 Intel IP Corporation Réseau d'adaptation d'impédance reconfigurable à large bande

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0457765U (fr) * 1990-09-26 1992-05-18
JP3021857U (ja) * 1995-08-23 1996-03-12 有限会社今井電機製作所 短縮型垂直，水平アンテナ整合装置
WO2017065142A1 (fr) * 2015-10-16 2017-04-20 株式会社村田製作所 Circuit d'antenne et dispositif de communication
WO2020005231A1 (fr) * 2018-06-27 2020-01-02 Intel IP Corporation Réseau d'adaptation d'impédance reconfigurable à large bande

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