WO2018211548A1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

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Publication number
WO2018211548A1
WO2018211548A1 PCT/JP2017/018140 JP2017018140W WO2018211548A1 WO 2018211548 A1 WO2018211548 A1 WO 2018211548A1 JP 2017018140 W JP2017018140 W JP 2017018140W WO 2018211548 A1 WO2018211548 A1 WO 2018211548A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
solenoid
planar loop
loop antenna
antennas
Prior art date
Application number
PCT/JP2017/018140
Other languages
English (en)
Japanese (ja)
Inventor
卓 関田
敦司 土屋
Original Assignee
Ｓｍｋ－Ｌｏｇｏｍｏｔｉｏｎ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｓｍｋ－Ｌｏｇｏｍｏｔｉｏｎ株式会社 filed Critical Ｓｍｋ－Ｌｏｇｏｍｏｔｉｏｎ株式会社
Priority to PCT/JP2017/018140 priority Critical patent/WO2018211548A1/fr
Publication of WO2018211548A1 publication Critical patent/WO2018211548A1/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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Definitions

  • the present invention relates to an antenna device using a solenoid antenna, and more particularly to an antenna device for performing short-range wireless communication by an electromagnetic induction method.
  • RFID or NFC generally employs an electromagnetic induction method in which a transmission side coil constituting an antenna of one communication terminal serving as an initiator and a reception side coil constituting an antenna of the other communication terminal serving as a target are electromagnetically coupled.
  • an excitation current is passed through the transmission coil of the initiator to generate a magnetic field, and the magnetic flux of the magnetic field lines passing through the reception coil of the target is changed according to the excitation current. Then, an induction current representing an exciting current is generated in the receiving coil.
  • an electromagnetic induction type RFID communication or NFC communication electronic authentication, electronic payment, and other data communication can be performed at high speed between a communication terminal such as a smartphone or an IC card and a communication terminal equipped with a reader / writer.
  • an active communication terminal having a power supply supplies power to operate each circuit in the passive communication terminal to a passive communication terminal such as an IC card having no power supply, and performs data communication with the passive communication terminal having no power supply. Can do.
  • Communication terminals that communicate with each other by RFID communication or NFC communication often have a relatively thin and flat outer shape, such as a tag attached to the surface of an article, an IC card to be carried, and a smartphone.
  • a flat loop antenna antenna device suitable for wiring on a printed wiring board or a magnetic sheet disposed along a flat plane in a housing is known (Patent Literature 1, Patent Literature 1). 2).
  • Patent Document 3 an antenna device that is used as an antenna for RFID communication by fixing a spiral coil to a flat printed wiring board itself to form a solenoid antenna is known.
  • planar loop antenna that occupies a large mounting area on the printed wiring board and the solenoid antenna formed by using the printed wiring board have restrictions on the mounting space for mounting other electronic components on the printed wiring board.
  • an antenna device 100 in which a solenoid antenna 101 that has a high volumetric efficiency and does not take a mounting area is mounted in parallel on a printed wiring board 102 housed in a casing of a flat mobile phone 110 is also mounted. (Patent Document 4).
  • the antenna device of the solenoid antenna described in Patent Document 3 is also formed using a flat printed wiring board, so that the mounting surface on the printed wiring board is occupied and the magnetic field radiated from the solenoid antenna is Flat communication with a solenoid antenna from the direction perpendicular to the planar loop antenna when the antenna on the other side that is electromagnetically coupled is the strongest in the planar direction of the communication terminal that is parallel to the substrate, that is, the flat shape, and is electromagnetically coupled.
  • the end face of the device is brought closer, and operability for performing RFID communication and NFC communication is lacking.
  • the antenna device 100 of the solenoid antenna described in Patent Document 4 is configured so that the flat surface of the casing of the mobile phone 110 parallel to the printed wiring board 102 on which the solenoid antenna 101 is mounted is connected to the other side parallel to the planar loop antenna.
  • the solenoid antenna 101 and a planar loop antenna (not shown) parallel to the central axis of the winding of the solenoid antenna 101 are electromagnetically coupled in proximity to the plane of the communication device casing. That is, the lines of magnetic force emanating from one end of the solenoid antenna 101 converge at the other end via the side of the solenoid antenna 101, and a part of the lines of magnetic force is a plane parallel to the central axis of the winding of the solenoid antenna 101. Therefore, even if the solenoid antenna and the planar loop antenna are arranged in parallel to each other, they are electromagnetically coupled.
  • the magnetic field generated by the solenoid antenna 101 decreases as the distance from one end of the solenoid antenna 101 decreases, and is strongest in the direction of the central axis of the winding of the solenoid antenna 101 as described above, and as the crossing angle with the central axis increases.
  • the magnetic flux density B in the planar loop antenna formed on a plane orthogonal to the central axis of the winding of the solenoid antenna 101 is low, and the mutual inductance is reduced, the communication distance is shortened, and the communication quality is lowered.
  • the magnetic flux density B of the magnetic field generated by the solenoid antenna 101 is proportional to the excitation current flowing through the winding of the solenoid antenna 101, the magnetic flux density B in the planar loop antenna can be increased by increasing the excitation current Iex.
  • the upper limit of the excitation current Iex is limited, and the above-described problems of communication distance and communication quality cannot be essentially improved.
  • An object of the present invention is to provide an antenna device capable of mutual communication at a predetermined communication distance without impairing the above.
  • Another object of the present invention is to provide an antenna device that performs electromagnetic induction communication with a planar loop antenna formed on a plane parallel to the printed wiring board without reducing the mounting density of the printed wiring board on which the solenoid antenna is mounted. To do.
  • An object of the present invention is to provide an antenna device capable of performing the above communication.
  • an antenna device is an antenna device electromagnetically coupled to a planar loop antenna, wherein the antenna device is arranged in a virtual plane parallel to a plane on which the planar loop antenna is formed at a predetermined interval.
  • a plurality of solenoid antennas arranged along the plane loop antenna, and a projection area obtained by projecting the area surrounded by the planar loop antenna onto the virtual plane is unified to either the divergence side or the convergence side of the magnetic field lines. It is characterized by facing each end.
  • the divergence from all the plurality of solenoid antennas The magnetic field lines penetrate the planar loop antenna in the same direction, and the magnetic flux density B in the planar loop antenna is the sum of the magnetic flux densities B generated in the planar loop antenna by each of the plurality of solenoid antennas.
  • a large induction current that changes in accordance with the excitation current can be generated in the planar loop antenna without increasing the excitation current flowing through the antenna.
  • the antenna device according to claim 2 is characterized in that each other end of the plurality of solenoid antennas is disposed outside the projection area.
  • the other ends of the plurality of solenoid antennas are arranged outside the projection area, the lines of magnetic force that diverge from each other end or converge at each other end do not pass through the plane loop antenna, and the inside of the plane loop antenna Does not decrease.
  • the antenna device according to claim 3 or 5 is characterized in that a plurality of solenoid antennas are mounted on a printed wiring board along a virtual plane.
  • the plurality of solenoid antennas are mounted along a printed wiring board parallel to the plane on which the planar loop antenna is formed, and an operation of bringing one surface of the housing covering the printed wiring board close to the plane on which the planar loop antenna is formed.
  • the solenoid antenna and the planar loop antenna are electromagnetically coupled.
  • the antenna device according to claim 4 is characterized in that a plurality of solenoid antennas are accommodated in a flat casing along a virtual plane.
  • the plurality of solenoid antennas are accommodated in the casing with the central axis of the winding along the flat surface of the casing.
  • the flat surface of the casing is parallel to the plane on which the planar loop antenna is formed, and the solenoid antenna and the planar loop antenna are electromagnetically coupled by operating the flat surface of the casing close to the plane on which the planar loop antenna is formed. .
  • the antenna device according to claim 6 is characterized in that the plurality of solenoid antennas are accommodated in a flat casing along a virtual plane of the NFC communication device operating in the active mode.
  • the plurality of solenoid antennas are accommodated along the flat surface of the flat casing of the NFC communication device, and an excitation current flows from the power source of the NFC communication device operating in the active mode to the plurality of solenoid antennas.
  • An induced current corresponding to the excitation current flows through a planar loop antenna formed on a plane parallel to the housing.
  • the antenna device according to claim 7 is characterized in that a plurality of solenoid antennas are mounted on a printed wiring board along a virtual plane of the NFC communication device.
  • the plurality of solenoid antennas are mounted on a printed wiring board along the flat surface of the casing of the NFC communication device, and the flat surface of the casing is brought into close contact with the plane on which the planar loop antenna is formed.
  • the loop antenna is electromagnetically coupled.
  • the antenna device according to claim 8 is characterized in that two solenoid antennas are arranged orthogonal to each other on a virtual plane.
  • One end of two solenoid antennas unified on either the diverging side or the converging side of the magnetic field lines can be approached from the orthogonal direction, and the two are close to the projection area projected on the virtual plane.
  • Each end of the solenoid antenna can be easily exposed.
  • the excitation current flowing through the solenoid antenna does not increase, and the planar loop antenna formed on the plane parallel to the central axis of the solenoid antenna winding does not impair the communication quality.
  • Mutual communication is possible at a communication distance.
  • a volume-efficient solenoid antenna can be mounted in a flat casing on a printed wiring board parallel to the flat plane, and the flat casing can be miniaturized.
  • the volume efficient solenoid antenna can be accommodated in the flat casing in parallel to the flat plane, and the flat casing can be miniaturized.
  • the flat surface of the housing is formed as a flat loop antenna in the same manner as a communication device having a flat loop antenna.
  • Mutual communication can be performed with an operation that makes the user feel close to the surface.
  • the solenoid antenna can be mounted in parallel to the flat surface on the printed wiring board accommodated in the case along the flat surface of the case of the NFC communication device.
  • a printed wiring board and a plurality of solenoid antennas can be efficiently accommodated in a simple housing.
  • one end of the two solenoid antennas can easily face the projection area where the planar loop antenna is projected, and the two solenoids The antenna can be electromagnetically coupled to the planar loop antenna.
  • FIG. 1 is a plan view showing an antenna device 1 according to an embodiment of the present invention and a memory card 50 on which a planar loop antenna 51 is formed. It is a top view which shows the state which the antenna apparatus 1 and the planar loop antenna 51 electromagnetically couple.
  • FIG. 3 is a schematic diagram showing the state shown in FIG. 2 cut along an XZ plane intersecting a planar loop antenna 51. It is explanatory drawing which shows the state which the antenna apparatus 1 and the planar loop antenna 51 electromagnetically couple. 3 is a partially omitted perspective view showing the relationship between a smartphone 10 housing an antenna device 1 and a memory card 50. FIG. It is explanatory drawing which shows the state which the antenna device 30 and the spiral planar loop antenna 52 electromagnetically couple.
  • FIG. 2 is a partially cutaway plan view showing a conventional antenna device 100 configured from a solenoid antenna 101 housed in a mobile phone 110.
  • the antenna device 1 has a power source among communication terminals such as an IC card and a smartphone having a short-range wireless communication function of RFID (Radio Frequency identifier) and NFC (Near Field Communication).
  • the memory card 50 is electromagnetically coupled with the planar loop antenna 51 mounted on the smartphone 10 which is an NFC communication device operable in the active mode and mounted on the memory card 50 which is a passive communication terminal of the NFC communication device. And electronic authentication, electronic payment, and other data communications.
  • the directions of X, Y, and Z in the description of each part are the directions of X, Y, and Z that are orthogonal to each other shown in these drawings.
  • the antenna device 1 includes two solenoid antennas 2a and 2b mounted on the printed wiring board 30 orthogonal to each other along the bottom surface of the printed wiring board 30 parallel to the XY plane. Is done.
  • the printed wiring board 30 on which the antenna device 1 is mounted is accommodated along the flat direction in the flat insulating case 11 along the direction of the XY plane of the smartphone 10, and as shown in FIG.
  • the memory card 50 communicates with the bottom surface of the insulating case 11 of the smartphone 10 and the surface of the opposing memory card 50 in contact with or close to each other and mounted in parallel on the bottom surface of the insulating case 11.
  • the solenoid antennas 2a and 2b and the planar loop antenna 51 formed in a plane parallel to the surface of the memory card 50 are electromagnetically coupled.
  • the plane on which the planar loop antenna 51 parallel to the XY plane is formed is PL, and the two solenoid antennas 2a and 2b are separated from the plane PL when communicating with the memory card 50. It is accommodated in the insulating case 11 of the smartphone 10 so as to be arranged along a virtual plane PL ′ parallel to the Z direction with a predetermined interval.
  • Each solenoid antenna 2a, 2b is formed by spirally winding a winding made of a copper wire on the outer peripheral surface of a cylindrical ferrite core.
  • a winding around a ferrite core having a relative permeability ⁇ s of 1000 to 2000, each solenoid antenna 2a, 2b generates a very high magnetic field while having a total length of 1 to 1.5 cm and a small capacity.
  • a magnetic field having a certain magnetic flux density B is also generated on the side of the central axis of the windings of the solenoid antennas 2a and 2b.
  • Both ends of the windings of the solenoid antennas 2a and 2b are connected to a signal source 3 for flowing an exciting current Iex through the windings. Accordingly, the solenoid antennas 2a and 2b are connected in parallel to the signal source 3, and when the modulation signal modulated by the communication data is superimposed on the excitation current Iex flowing from the signal source 3, the solenoid antennas 2a and 2b A modulation signal synchronized with the winding flows.
  • both ends of the solenoid antenna 2 are the diverging side or the converging side is determined by the winding direction of the winding and the direction of the exciting current flowing in the winding according to the so-called right-handed screw law.
  • the solenoid antenna 2a arranged along the X direction has the exciting current Iex flowing clockwise in the ⁇ X direction.
  • the solenoid antenna 2b arranged along the Y direction flows the excitation current Iex counterclockwise in the Y direction (the right end) is the divergent side and the other end (the left end) in the ⁇ X direction is the convergence side.
  • the one end (lower end) in the ⁇ Y direction is the divergent side, and the other end (upper end) in the Y direction is the converging side.
  • an orthogonal arrangement is provided along the virtual plane PL ′ in the projection area AR (area shown by hatching in FIGS. 4 and 5) obtained by projecting the area surrounded by the planar loop antenna 51 onto the virtual plane PL ′.
  • One end of each of the two solenoid antennas 2a and 2b is exposed, and the winding direction of the winding or the direction of the excitation current Iex flowing in the winding is adjusted so that all of the one end facing the projection area AR diverges. Unified to the side.
  • a plane loop in which a plane plane parallel to the solenoid antennas 2a and 2b is formed in PL on one side (Z direction) of the diverging side of the two solenoid antennas 2a and 2b is formed.
  • the magnetic lines of force radiated from the two solenoid antennas 2a and 2b penetrate in the same direction ( ⁇ Z direction).
  • the other end on the convergence side where the magnetic lines of force of the two solenoid antennas 2a and 2b converge is disposed outside the projection area AR of the planar loop antenna 51, so that Z converges on the planar loop antenna 51.
  • the magnetic field lines directed in the direction do not penetrate the planar loop antenna 51.
  • the magnetic field component Hz radiated by the two solenoid antennas 2a and 2b is not canceled by the magnetic field component -Hz in the opposite direction, and the two solenoid antennas 2a, A high magnetic field is added to the magnetic field radiated by 2b, and the mutual inductance between the antenna device 1 including the two solenoid antennas 2a and 2b and the planar loop antenna 51 can be increased.
  • the planar loop antenna 51 is supplied with the exciting current Iex flowing through the winding for each solenoid antenna 2a, 2b, and the induced current Iind, which is the sum of the induced currents generated in the planar loop antenna 51, flows to each solenoid antenna 2a, 2b. Even if the upper limit of the excitation current Iex flowing through the windings of N is limited, data communication between the smartphone 10 and the memory card 50 can be performed without impairing communication quality.
  • the two solenoid antennas 2a and 2b are required.
  • An antenna comprising two solenoid antennas 2a and 2b orthogonal to each other in the X and Y directions so that one end unified on the divergent side faces the projection area AR and the other end is disposed outside the projection area AR.
  • the L-shaped protrusion is formed from the bottom surface of the insulating case 11 of the smartphone 10 as shown in FIG.
  • the portion 12 is provided so as to contact the memory card 50 that is approached from the oblique directions of the X and -Y directions, and is positioned at the relative position shown in FIG.
  • the memory card 50 is brought close to a part of the insulating case 11 of the smartphone 10. You may display the guide mark which shows.
  • the memory card 50 includes a planar loop antenna 51 formed of a conductor pattern spirally formed on an insulating substrate along the periphery of the rectangular memory card 50, and modulates / demodulates a signal flowing through the planar loop antenna 51, A logic circuit 53 for performing data communication and a memory 54 connected to the logic circuit 53 are provided.
  • the logic circuit 53 and the memory 54 are integrated on an IC chip 55 and mounted on the memory card 50.
  • the IC chip 55 operates using the induced electromotive force generated in the planar loop antenna 51 by being electromagnetically coupled to the antenna device 1 as a power source.
  • the exciting current Iex on which the modulation signal modulated by the communication data is superimposed is sent from the signal source 3 on the smartphone 10 side to the two solenoid antennas 2a and 2b at the position shown in FIG. 2, the two solenoid antennas 2a
  • the induced current Iind corresponding to the exciting current Iex flows clockwise through the planar loop antenna 51 that is electromagnetically coupled to 2b. Since the magnetic flux density B generated in the planar loop antenna 51 is proportional to the excitation current Iex, and the induced current Iind is proportional to the magnetic flux density B generated in the planar loop antenna 51, the induced current input to the logic circuit 53.
  • Iind is proportional to the excitation current Iex, and the communication data is demodulated from the modulation signal superimposed on the induction current Iind.
  • the logic circuit 53 reads predetermined specific data from the memory 54 to be connected, passes the excitation current Iex modulated with the specific data to the planar loop antenna 51, and supplies the excitation current to the two solenoid antennas 2a and 2b that are electromagnetically coupled. An induced current Iind proportional to Iex is generated.
  • a demodulation circuit (not shown) on the smartphone 10 side demodulates the unique data from the modulation signal superimposed on the induced current Iind of the two solenoid antennas 2a and 2b, and performs electronic authentication, electronic payment, Perform other data communications.
  • the impedance and voltage phase of the antenna device 1 of the smartphone 10 are changed by changing the impedance on the memory card 50 side with the specific data. It can also be performed by a load modulation method to be changed.
  • the surface of the memory card 50 parallel to the planar loop antenna 51 and the two solenoid antennas 2a and 2b are accommodated at a position where the planar loop antenna 51 and the two solenoid antennas 2a and 2b of the antenna device 1 are electromagnetically coupled. Since the bottom surfaces of the smartphones 10 facing each other are parallel to each other, the user can perform data between the two by a simple operation of bringing the surface of the flat memory card 50 close together while holding the bottom surface of the flat smartphone 10. Communication can be performed.
  • the planar loop antenna does not have to be rectangular along the periphery of the memory card 50 like the planar loop antenna 51 shown in the above-described embodiment, and is a circular or elliptical shape, or a conductor pattern as shown in FIG. May be a planar loop antenna 52 formed in a spiral shape.
  • the planar loop antennas 51 and 52 are formed of spiral conductive lines or conductor patterns whose outermost contours are not closed, so the boundary of the region surrounded by the planar loop antennas 51 and 52 is not clear.
  • the region is surrounded by the outermost conductive line or conductor pattern of the spiral conductive line or conductor pattern excluding the lead line drawn from the planar loop antennas 51 and 52. Therefore, the above-described projection area AR obtained by projecting the area surrounded by the planar loop antennas 51 and 52 onto the virtual plane PL ′ is an area displayed with diagonal lines in FIGS.
  • each end of the plurality of solenoid antennas 2a, 2b unified on either the divergence side or the convergence side of the magnetic field lines is allowed to face the projection area AR is when the one end is not necessarily disposed inside the projection area AR.
  • the position is not limited to the projection area AR and is close to the projection area AR. This is because the lines of magnetic force radiated from the plurality of solenoid antennas 2a and 2b penetrate the planar loop antennas 51 and 52 in the same direction as long as they are at least close to the projection area AR.
  • the two solenoid antennas 2a and 2b are arranged orthogonally on the virtual plane PL ′ along the flat direction of the flat casing, but as shown in FIG. You may arrange
  • the antenna device 1 is not limited to two, but includes three or more solenoid antennas 2, and one end of each solenoid antenna 2 unified on either the diverging side or the converging side of the lines of magnetic force faces the projection area AR. May be.
  • Suitable for antenna devices that perform data communication between RFID communication devices and NFC communication devices by electromagnetic coupling with planar loop antennas.
  • Antenna device Solenoid antenna 10 Smartphone (NFC communication device) 11 Insulation case (housing) 30 Printed Wiring Board 51 Planar Loop Antenna 52 Spiral Plane Loop Antenna PL Plane PL ′ where Planar Loop Antenna is Formed Virtual Planar AR Projection Area

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  • Near-Field Transmission Systems (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un dispositif d'antenne avec lequel, même si un plan dans lequel est formée une antenne cadre plane en vue d'un couplage électromagnétique est parallèle à une direction d'axe central d'une antenne solénoïde, une communication mutuelle peut être obtenue à une distance de communication prédéterminée sans dégradation de la qualité de communication. Les extrémités respectives d'une pluralité d'antennes solénoïde sont disposées uniformément sur le côté divergent ou le côté convergent de lignes de force magnétiques, et sont agencées pour faire face à une zone projetée obtenue par projection d'une zone entourée par l'antenne cadre plane sur un plan virtuel, et les lignes de force magnétiques rayonnées à partir de l'ensemble de la pluralité d'antennes solénoïde sont amenées à passer à travers l'antenne cadre plane dans la même direction. De cette manière, un courant induit important qui change en fonction d'un courant d'excitation peut être généré dans l'antenne cadre plane, et la qualité de communication n'est pas dégradée même si l'antenne cadre plane est située latéralement et en parallèle avec les antennes solénoïde.
PCT/JP2017/018140 2017-05-15 2017-05-15 Dispositif d'antenne WO2018211548A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2017/018140 WO2018211548A1 (fr) 2017-05-15 2017-05-15 Dispositif d'antenne

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Application Number Priority Date Filing Date Title
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WO2018211548A1 true WO2018211548A1 (fr) 2018-11-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014086993A (ja) * 2012-10-26 2014-05-12 Tokai Rika Co Ltd 通信エリア形成装置
WO2014072075A1 (fr) * 2012-11-12 2014-05-15 Premo, Sl Antenne tridimensionnelle
WO2015098794A1 (fr) * 2013-12-26 2015-07-02 株式会社村田製作所 Dispositif d'antenne et appareil électronique
JP2016059123A (ja) * 2014-09-08 2016-04-21 株式会社日本自動車部品総合研究所 非接触給電装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014086993A (ja) * 2012-10-26 2014-05-12 Tokai Rika Co Ltd 通信エリア形成装置
WO2014072075A1 (fr) * 2012-11-12 2014-05-15 Premo, Sl Antenne tridimensionnelle
WO2015098794A1 (fr) * 2013-12-26 2015-07-02 株式会社村田製作所 Dispositif d'antenne et appareil électronique
JP2016059123A (ja) * 2014-09-08 2016-04-21 株式会社日本自動車部品総合研究所 非接触給電装置

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