WO2016186092A1 - Antenna device and electronic apparatus - Google Patents

Antenna device and electronic apparatus Download PDF

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Publication number
WO2016186092A1
WO2016186092A1 PCT/JP2016/064545 JP2016064545W WO2016186092A1 WO 2016186092 A1 WO2016186092 A1 WO 2016186092A1 JP 2016064545 W JP2016064545 W JP 2016064545W WO 2016186092 A1 WO2016186092 A1 WO 2016186092A1
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WO
WIPO (PCT)
Prior art keywords
coil
antenna
conductor
antenna coil
feeding
Prior art date
Application number
PCT/JP2016/064545
Other languages
French (fr)
Japanese (ja)
Inventor
伊藤宏充
Original Assignee
株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to CN201690000700.3U priority Critical patent/CN207638003U/en
Publication of WO2016186092A1 publication Critical patent/WO2016186092A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/02—Details
    • 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, and more particularly, to an antenna device including an antenna coil and a feeding coil.
  • the present invention also relates to an electronic apparatus including the antenna device.
  • Patent Document 1 discloses an antenna device including an antenna coil formed of a coil conductor along a surface and a feeding coil that is mainly magnetically coupled to the antenna coil.
  • 10A is a front view of the antenna device disclosed in Patent Document 1
  • FIG. 10B is a plan view thereof.
  • a power feeding circuit is configured, and a power feeding coil 30 to which the power feeding circuit is connected is mounted.
  • the antenna coil 20 is disposed close to the power supply coil 30, so that the power supply coil 30 is mainly magnetically coupled to the antenna coil 20.
  • the feeding coil 30 and the antenna coil 20 are magnetically coupled via a magnetic flux ⁇ n penetrating the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20.
  • the magnetic flux passing through the coil opening of the feeding coil 30 may generate a magnetic flux that does not contribute to the coupling with the antenna coil 20 as indicated by the magnetic flux ⁇ a.
  • the coupling coefficient between the feeding coil 30 and the antenna coil 20 cannot be sufficiently increased.
  • An object of the present invention is to provide an antenna device that includes an antenna coil and a feeding coil made of a coil conductor, and has an increased coupling coefficient between the feeding coil and the antenna coil, and an electronic apparatus including the antenna device.
  • An antenna device of the present invention includes an antenna coil configured by a coil conductor along a surface, and a feeding coil disposed at a position where the antenna coil is magnetically coupled,
  • the antenna coil is disposed on the antenna coil side with respect to the feeding coil, and is formed in the vicinity of the first part of the antenna coil in a plan view, and extends from the first part of the antenna coil to the outside of the antenna coil.
  • a planar conductor having a region that does not overlap with the coil opening of the antenna coil,
  • the feeding coil is disposed at a position at least magnetically coupled to a second part other than the first part of the antenna coil.
  • the first part of the antenna coil is opposed to the feeding coil with a coil axis of the antenna coil interposed therebetween.
  • the effective area of the coil opening of the antenna coil viewed from the power supply coil is increased, and thereby the coupling coefficient between the power supply coil and the antenna coil can be further increased.
  • the planar conductor has a first side, the first part of the antenna coil extends along the first side of the planar conductor, and the feeding coil
  • the coil axis direction is preferably perpendicular to the first side of the planar conductor.
  • the feeding coil overlaps with the coil opening of the antenna coil or the second part of the antenna coil. Is preferable. As a result, one of the two coil openings of the feeding coil and the coil opening of the antenna coil are close to each other, so that the magnetic flux passing through the coil opening of the feeding coil and the coil opening of the antenna coil is relatively increased. An antenna device having a high coupling coefficient between the coil and the antenna coil can be obtained.
  • the coil conductor is preferably a conductor pattern formed on a circuit board.
  • the planar conductor is preferably a ground conductor formed on a circuit board. Thereby, it is not necessary to provide a planar conductor specially, and size reduction can be achieved.
  • An electronic device of the present invention includes an antenna device and a housing,
  • the antenna device is An antenna coil composed of a coil conductor along the surface;
  • a feeding coil disposed at a position where the antenna coil and a magnetic field are coupled,
  • the antenna coil is disposed on the antenna coil side with respect to the feeding coil, and is formed in the vicinity of the first part of the antenna coil in a plan view, and extends from the first part of the antenna coil to the outside of the antenna coil.
  • a planar conductor having a region that does not overlap with the coil opening of the antenna coil,
  • the feeding coil is disposed at a position where it is at least magnetically coupled to a second part other than the first part of the antenna coil.
  • an antenna device having a high coupling coefficient between the feeding coil and the antenna coil is configured, and an electronic device including a highly efficient antenna device can be obtained.
  • the housing has a conductor portion, and the antenna coil is connected to the conductor portion of the housing.
  • casing can serve as a part of antenna coil, and it is easy to comprise an antenna coil with a large coil opening. Further, since the antenna coil is closer to the communication partner antenna, the coupling coefficient with the communication partner antenna is increased.
  • the planar conductor is preferably a conductor portion of the casing.
  • casing can serve as a planar conductor, for example, the freedom degree of arrangement
  • an antenna device having a high coupling coefficient between the feeding coil and the antenna coil, and an electronic apparatus including the antenna device can be obtained.
  • FIG. 1 is a plan view showing the configuration of the antenna device 101 according to the first embodiment.
  • 2A is a cross-sectional view taken along the line AA of the antenna device 101
  • FIG. 2B is a cross-sectional view of an antenna device 101P as a comparative example.
  • 3A to 3C are cross-sectional views of the antenna devices 102A to 102C according to the second embodiment.
  • FIG. 4 is a plan view showing the configuration of the antenna device 103 according to the third embodiment.
  • FIG. 5 is a cross-sectional view of the antenna device 103 taken along the line AA.
  • FIG. 6 is a plan view showing the configuration of the antenna device 104 according to the fourth embodiment.
  • FIG. 7 is a plan view showing a configuration of an antenna device 105 according to the fifth embodiment and an electronic apparatus 205 including the antenna device 105.
  • FIG. 8 is a perspective view illustrating the configuration of the first conductor portion 1, the second conductor portion 2, and the circuit board 100 of the housing of the electronic device 205.
  • FIG. 9A is an equivalent circuit diagram illustrating the operation of the antenna device 105 in the second frequency band.
  • FIG. 9B is an equivalent circuit diagram illustrating the operation of the antenna device 105 in the first frequency band.
  • 10A is a front view of the antenna device disclosed in Patent Document 1
  • FIG. 10B is a plan view thereof.
  • the “standing wave antenna” is an antenna that generates a standing wave of current or voltage (potential) on the radiating element. That is, resonance occurs so that nodes and antinodes of current and voltage (potential) strength are generated on the radiating element. For example, due to the boundary conditions of the current and voltage (potential) on the radiating element, the current becomes 0 at the end of the radiating element, and when connected to the ground, the voltage becomes 0 at the connection with the ground.
  • Typical standing wave antennas include dipole antenna, monopole antenna, inverted L-type antenna, inverted F-type antenna (IFA), one-wavelength loop antenna, folded dipole antenna, folded monopole antenna, microstrip antenna, patch antenna , Plate inverted F type antenna (PIFA), slot antenna, notch antenna, subtypes of each antenna (multiple radiating elements connected in parallel, multiple stubs, radiating element shape changes depending on location, etc.) It is.
  • a standing wave antenna is used for communication by electromagnetic waves (radio waves) in the far field.
  • electromagnetic waves radio waves
  • it is used for telephone calls and data communication in mobile phone terminals, wireless LAN communication, satellite signal reception in GPS, and the like.
  • the “magnetic field antenna” is a kind of minute loop antenna and is an antenna that radiates magnetic flux.
  • Magnetic field type antenna is used for communication by magnetic field coupling in the near field.
  • it is used for communication such as NFC (Near field communication).
  • an antenna device that is a “magnetic antenna” is used, for example, in the HF band, and is particularly used at a frequency near 13.56 MHz or 13.56 MHz.
  • the size of the antenna device is sufficiently smaller than the wavelength ⁇ at the used frequency, and the radiation characteristics of electromagnetic waves are poor in the used frequency band.
  • the length of the coil conductor of the antenna coil provided in the antenna device described later is ⁇ / 10 or less.
  • the wavelength here refers to the effective wavelength in consideration of the wavelength shortening effect by the dielectric property and permeability of the base material on which the antenna is formed.
  • a coil conductor included in the antenna coil is electrically connected to a power feeding circuit that operates a used frequency band (HF band, particularly around 13.56 MHz).
  • the “electronic device” in the present invention is a device including the standing wave antenna and the magnetic field antenna.
  • it is a mobile phone terminal, so-called smart phone, tablet terminal, notebook PC, wearable terminal (so-called smart watch, smart glass, etc.).
  • FIG. 1 is a plan view showing the configuration of the antenna device 101 according to the first embodiment.
  • 2A is a cross-sectional view taken along the line AA of the antenna device 101
  • FIG. 2B is a cross-sectional view of an antenna device 101P as a comparative example.
  • the antenna device 101 includes an antenna coil 20 and a feeding coil 30.
  • the antenna coil 20 is formed in the inside (inner layer) of the circuit board 100 and includes a coil conductor 20 ⁇ / b> C having a plurality of turns along the surface of the circuit board 100.
  • the feeding coil 30 is formed by forming a helical coil with a conductor pattern on a laminated body of laminated magnetic layers.
  • the feeding coil 30 is disposed in the vicinity of the antenna coil 20. That is, the helical coil of the feeding coil 30 is mounted on the circuit board 100 in the vicinity of the antenna coil 20 so as to be magnetically coupled to the antenna coil 20 mainly.
  • the helical coil of the feeding coil 30 can be strongly magnetically coupled to the antenna coil 20 by arranging the feeding coil 30 in the coil opening 20 ⁇ / b> A of the antenna coil 20 or at a position overlapping the second portion 22 of the antenna coil 20. .
  • the antenna coil 20 is preferably arranged as close to the end of the circuit board 100 as possible. As a result, the antenna coil 20 is closer to the communication partner, and communication characteristics (coupling) are improved. The same applies to other embodiments described below.
  • a resonance capacitor 8 is mounted on the circuit board 100, and the resonance capacitor 8 is connected to both ends of the coil conductor 20C. Therefore, an LC series resonance circuit is configured by the antenna coil 20 and the resonance capacitor 8.
  • the circuit board 100 is provided with a power supply circuit 9 such as an RFIC, and the power supply circuit 9 is connected to the power supply coil 30.
  • a power supply circuit 9 such as an RFIC
  • the planar conductor 10 which is a ground conductor, for example, is formed on the back surface of the circuit board 100.
  • a region where the planar conductor 10 is formed is a ground region GA, and a region where the planar conductor 10 is not formed is a non-ground region NGA.
  • the planar conductor 10 is disposed in the vicinity of the first portion 21 of the antenna coil 20.
  • the first portion 21 of the antenna coil 20 overlaps the planar conductor 10 in plan view.
  • the feeding coil 30 is disposed at a position at least magnetically coupled to the second portion 22 other than the first portion 21 of the antenna coil 20. As shown in FIG. 2A, the feeding coil 30 is magnetically coupled to the antenna coil 20 through a magnetic flux ⁇ n that passes through the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20.
  • the “vicinity” of the first portion 21 of the antenna coil 20 is a distance range equal to or smaller than the size of the antenna coil 20 in plan view.
  • the planar conductor 10 compares the dimension L11 of the portion that overlaps the first portion 21 of the antenna coil 20 with the dimension L12 of the portion that does not overlap the first portion 21 of the antenna coil 20, L12 > L11. That is, the planar conductor 10 extends from the first portion 21 of the antenna coil 20 to the outside of the antenna coil 20. Thereby, generation
  • the magnetic flux passing through the coil opening of the feeding coil 30 intersects the planar conductor 10 or the magnetic flux generated by the first portion 21 of the antenna coil 20 intersects the planar conductor 10, an eddy current is generated in the planar conductor 10. Therefore, the magnetic flux does not easily spread to the planar conductor 10, and a magnetic flux that does not contribute to the coupling with the antenna coil 20, as indicated by the magnetic flux ⁇ a in FIG.
  • the coil opening 20A is penetrated efficiently. As a result, the coupling coefficient between the feeding coil 30 and the antenna coil 20 is improved as compared with the case where the planar conductor 10 is not provided.
  • the first portion 21 of the antenna coil 20 faces the feeding coil 30 with the coil axis 20AX of the antenna coil 20 interposed therebetween.
  • the effective area of the coil opening 20A of the antenna coil 20 viewed from the power supply coil 30 is increased, whereby the coupling coefficient between the power supply coil 30 and the antenna coil 20 can be further increased.
  • the planar conductor 10 has the first side 10 ⁇ / b> S, and the first portion 21 of the antenna coil 20 extends along the first side 10 ⁇ / b> S of the planar conductor 10.
  • the direction of the coil axis 30AX of the feeding coil 30 is substantially perpendicular to the first side 10S of the planar conductor 10.
  • the antenna coil 20 on one side (lower side in the example shown in FIG. 2A) with the plane 30S as a boundary. And the planar conductor 10 are both arranged, the coupling coefficient between the feeding coil 30 and the antenna coil 20 can be effectively increased.
  • the plane 30S including the center of the feeding coil 30 is one side of the plane 30S as a boundary (in the example shown in FIG.
  • the antenna coil 20 is disposed on the upper side, and the planar conductor 10 is disposed on the upper side.
  • there is almost no effect of preventing the generation of the magnetic flux ⁇ a that does not contribute to coupling and there is almost no effect of improving the coupling coefficient between the feeding coil 30 and the antenna coil 20.
  • the antenna coil 20 is formed inside (inner layer) of the circuit board 100, but may be formed on the front surface or the back surface of the circuit board 100. Further, the antenna coil 20 may be formed not only on the circuit board 100 but also on a flexible base material, or may be formed of a conductive wire or the like.
  • the planar conductor 10 is formed inside (inner layer) of the circuit board 100, but may be formed on the front surface or the back surface of the circuit board 100.
  • the planar conductor 10 is not limited to the one configured on the circuit board 100, for example, a battery pack or a shield disposed in a casing including the antenna device 101, and a casing or the like when the casing has conductivity. May be substituted as the planar conductor 10.
  • the planar conductor 10 is a ground conductor, but is not necessarily a ground conductor. It is not necessary to connect to the ground.
  • the potential of the planar conductor 10 is almost irrelevant with respect to the effect of preventing the generation of magnetic fluxes that do not contribute to coupling in this embodiment. However, if the planar conductor 10 is at ground potential, generation of unnecessary electromagnetic noise from the planar conductor 10 can be suppressed.
  • the planar conductor 10 does not overlap with the coil opening of the antenna coil 20 in plan view. If the planar conductor 10 overlaps the coil opening of the antenna coil 20, the magnetic coupling between the feeding coil 30 and the antenna coil 20 is hindered. If the area where the planar conductor 10 and the coil opening of the antenna coil 20 do not overlap at least 1/3 of the coil opening in the coil opening of the antenna coil 20 at least in plan view, the feeding coil 30 and the antenna coil 20 are sufficiently Magnetic field coupling.
  • the antenna coil 20 and the planar conductor 10 are formed on the same circuit board 100 (including the case where the antenna coil 20 has a multilayer structure), the antenna coil 20 and the planar conductor 10 can be brought closer to each other. The generation of magnetic flux that does not contribute to the coupling between the feeding coil 30 and the antenna coil 20 that passes between the antenna coil 20 and the planar conductor 10 can be prevented.
  • Second Embodiment >> In the second embodiment, several antenna devices having different antenna coil structures compared to the first embodiment will be described.
  • 3A to 3C are cross-sectional views of the antenna devices 102A to 102C. Both are cross-sectional views at positions corresponding to the cross-sectional view shown in FIG. 2 in the first embodiment.
  • the antenna coil 20 is configured by a coil conductor 20C having a plurality of turns along the surface of the circuit board 100 across a plurality of layers inside the circuit board 100.
  • the configuration other than the coil conductor 20C is the same as that of the antenna device 101 shown in FIG.
  • the antenna coil may be configured by the coil conductor 20C extending over a plurality of layers.
  • an antenna coil having a predetermined inductance can be configured with a limited area.
  • planar conductors 10A and 10B are formed on both surfaces of the substrate 100.
  • the configuration other than the planar conductors 10A and 10B is the same as that of the antenna device 101 shown in FIG.
  • the planar conductor may be formed in a plurality of layers.
  • the magnetic flux that does not contribute to the coupling is more reliably blocked by the planar conductor.
  • the planar conductor 10 is formed on the mounting surface of the feeding coil 30.
  • the configuration other than the planar conductor 10 is the same as that of the antenna device 101 shown in FIG.
  • the planar conductor 10 may be disposed at a position closer to the feeding coil 30 than the first portion 21 of the antenna coil 20. Accordingly, it is possible to prevent the generation of magnetic flux that does not contribute to the coupling between the feeding coil 30 and the antenna coil 20 that passes between the antenna coil 20 and the planar conductor 10.
  • FIG. 4 is a plan view showing the configuration of the antenna device 103 according to the third embodiment.
  • FIG. 5 is a cross-sectional view of the antenna device 103 taken along the line AA.
  • the antenna coil 20 of the antenna device 103 is formed on the second surface S ⁇ b> 2 of the circuit board 100, and is configured by a multi-turn coil conductor 20 ⁇ / b> C along the second surface of the circuit board 100. Further, planar conductors 10M and 10N that are ground conductors are also formed on the second surface S2 of the circuit board 100.
  • a discontinuous portion DS for maintaining an insulation state between the planar conductors 10M and 10N and the first portion 21 of the antenna coil 20 is formed.
  • the first portion 21 of the antenna coil 20 is formed in the discontinuous portion DS.
  • the resonance capacitor 8 is mounted on the non-ground region NGA of the circuit board 100.
  • Other configurations are the same as those of the antenna device 101 shown in FIG.
  • the antenna device 103 can be made thinner by forming the antenna coil 20 and the planar conductors 10M and 10N on the same plane.
  • the first planar conductor 10M and the second planar conductor 10N may be made conductive by wiring formed inside the circuit board (inner layer) or the like.
  • the first planar conductor 10M and the second planar conductor 10N have the same potential, and generation of unnecessary electromagnetic noise from the first planar conductor 10M or the second planar conductor 10N can be suppressed. it can.
  • the second planar conductor 10N can also be used as a ground for mounting components on the circuit board.
  • the second planar conductor 10N may be removed so as not to disturb the magnetic field coupling between the feeding coil 30 and the antenna coil 20.
  • the planar conductor 10 ⁇ / b> M is disposed in the vicinity of the first portion 21 of the antenna coil 20.
  • FIG. 6 is a plan view showing the configuration of the antenna device 104 according to the fourth embodiment.
  • the first portion 21 of the antenna coil 20 overlaps the planar conductor 10 in plan view.
  • the feeding coil 30 is disposed at a position at least magnetically coupled to the second portion 22 of the antenna coil 20. As shown in FIG. 6, the feeding coil 30 and the antenna coil 20 are magnetically coupled via a magnetic flux ⁇ n that passes through the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20.
  • the coil axis direction of the power supply coil 30 is planar. Even when the direction is not perpendicular to the first side 10 ⁇ / b> S of the conductor 10, the planar conductor 10 prevents generation of magnetic flux that does not contribute to coupling.
  • the communicating party antenna and the feeding coil 30 are magnetically coupled so as to cancel the magnetic field coupling between the communicating party antenna and the antenna coil 20.
  • the antenna device 104 may be reduced in coupling coefficient. Therefore, by selecting the positional relationship between the feeding coil 30 and the antenna coil 20, the antenna device 104 with better communication characteristics can be configured at a specific position.
  • the direction of the coil axis 30AX of the power feeding coil 30 is parallel to the coil opening of the antenna coil 20 is shown, but the present invention is not limited to this.
  • the direction of the coil axis 30AX of the feeding coil 30 and the direction of the coil axis 20AX of the antenna coil 20 may be substantially parallel.
  • FIG. 7 is a plan view showing a configuration of an antenna device 105 according to the fifth embodiment and an electronic apparatus 205 including the antenna device 105.
  • FIG. 8 is a perspective view illustrating the configuration of the first conductor portion 1, the second conductor portion 2, and the circuit board 100 of the housing of the electronic device 205.
  • the electronic device 205 is a portable electronic device having a communication function, such as a so-called smartphone or tablet terminal.
  • the housing of the electronic device 205 has a first conductor portion 1 and a second conductor portion 2.
  • first conductor portion 1 and the second conductor portion 2 are molded bodies of a metal plate such as an anodized aluminum plate, for example.
  • the first conductor portion 1 has three surfaces parallel to the Z direction, and the second conductor portion 2 has three surfaces parallel to the Y direction.
  • a circuit board 100 is provided inside the housing.
  • the antenna device 105 is configured by a circuit formed on the circuit board 100 and the first conductor portion 1 of the housing.
  • casing is an example of a planar conductor.
  • the first conductor portion 1 of the housing is a part of the antenna coil.
  • the circuit board 100 is provided with a power supply circuit 9, a power supply coil 30, a coil conductor 20C, first frequency band cutoff elements 7A and 7B, a resonance capacitor 8, and the like.
  • the first portion 21 of the antenna coil 20 overlaps the second conductor portion 2 of the housing in plan view.
  • the first end of the coil conductor 20 ⁇ / b> C is connected to the connection location P ⁇ b> 1 of the first conductor portion 1 via the first frequency band cutoff element 7 ⁇ / b> A and the connection conductor 41.
  • the second end of the coil conductor 20C is grounded.
  • One end of the series circuit of the first frequency band cut-off element 7B and the resonance capacitor 8 is connected to the connection location P2 of the first conductor portion 1 via the connection conductor 42.
  • the other end is grounded.
  • the connection conductors 41 and 42 are, for example, movable probe pins or conductive screws.
  • An antenna coil as a magnetic field antenna is configured by the connection portion P1-P2 of the first conductor portion 1 and the coil conductor 20C.
  • the feeding coil 30 is disposed between the connection points P1 and P2 of the first conductor portion 1 and at a position where it is magnetically coupled to the coil conductor 20C.
  • a power feeding circuit 9 such as an RFIC is connected to the power feeding coil 30.
  • the circuit board 100 is further provided with a power feeding circuit 6 and a power feeding circuit 5 for the first frequency band.
  • a power feeding circuit 5 is connected to the connection point P ⁇ b> 1 of the first conductor portion 1 via a power feeding unit circuit 6.
  • FIG. 9A is an equivalent circuit diagram showing the operation of the antenna device 105 in the second frequency band.
  • the power feeding unit circuit 6 since the power feeding unit circuit 6 has a high impedance in the second frequency band (HF band), the power feeding unit circuit 6 and the power feeding circuit 5 are not shown in FIG. 9A.
  • An antenna coil (a loop portion of a magnetic field type antenna for the second frequency band) between the connection points P1 and P2 of the first conductor part 1, the connection conductors 41 and 42, the first frequency band cutoff elements 7A and 7B, and the coil conductor 20C. Is configured.
  • An LC series resonance circuit is constituted by the inductance of the loop portion and the resonance capacitor 8.
  • the antenna coil 20 coupled to the feeding coil 30 is represented by one coil. Due to the coupling of the antenna coil 20 and the feeding coil 30, a signal in the second frequency band is fed to the antenna coil.
  • the conductor portion of the housing is also used as a part of the antenna coil, it is easy to configure an antenna coil with a large coil opening, and the antenna coil is closer to the communication partner antenna.
  • the coupling coefficient with the communication partner antenna increases.
  • FIG. 9B is an equivalent circuit diagram illustrating the operation of the antenna device 105 in the first frequency band.
  • the power feeding unit circuit 6 shown in FIG. 7 is a capacitor for blocking the second frequency band.
  • the first frequency band is, for example, the UHF band or the SHF band.
  • the power feeding circuit 6 has a low impedance, and therefore, in FIG. 9B, it is represented as a directly connected circuit.
  • the first frequency band cut-off elements 7A and 7B are inductors and have high impedance in the first frequency band, and are not shown as circuits in FIG. 9B.
  • the first frequency band cutoff elements 7A and 7B may be LC parallel resonance circuits that resonate in the first frequency band.
  • the power supply circuit 5 is, for example, a UHF band or SHF band RFIC.
  • the power feeding circuit 5 feeds a signal in the first frequency band to the connection point P ⁇ b> 1 of the first conductor portion 1.
  • the first conductor portion 1 acts as a standing wave antenna such as an inverted L antenna.
  • the planar conductor according to the present invention is configured by the ground conductor formed on the circuit board or the conductor portion of the casing.
  • a shield plate, a battery pack or the like may also be used as the planar conductor.
  • planar shape of the circuit board 100 and the planar conductor 10 and the outer shape of the antenna coil 20 are rectangular. However, the present invention is not limited to this shape. Some or all of these may be curved.
  • the feeding coil 30 and the antenna coil 20 have been described as being coupled mainly via a magnetic field. However, due to the proximity of the two conductor patterns, coupling via an electric field also occurs. Electric field coupling may also be used.
  • the antenna coil acts as a magnetic field radiation antenna that contributes to magnetic field radiation for near-field communication, but the present invention is not limited to this configuration.
  • the antenna coil can also be used as a power receiving antenna or a power transmitting antenna of a non-contact power transmission system using at least magnetic coupling such as an electromagnetic induction type non-contact power transmission system or a magnetic resonance type non-contact power transmission system.
  • the antenna coil is a power transmission antenna
  • the second power feeding circuit is a power transmission circuit that supplies power to the power transmission antenna.
  • the antenna coil is a power receiving antenna
  • the second power feeding circuit is a power receiving circuit that supplies power from the power receiving antenna to a load in the power receiving device.

Abstract

An antenna device (101) comprising: an antenna coil (20) comprising a coil conductor (20C) following a plane; and a power supply coil (30) arranged at a position for magnetically coupling to the antenna coil (20). The antenna device (101) also comprises a planar conductor (10). The planar conductor (10) is arranged on the antenna coil (20) side of the power supply coil (30) and, in the planar view, is formed in the vicinity of a first section (21) of the antenna coil (20), extends from the first section (21) of the antenna coil (20) to the outside of the antenna coil (20), and has an area that does not overlap with a coil opening (20A) of the antenna coil (20). The power supply coil (30) is arranged at a position for at least magnetically coupling to a second section (22) being a section other than the first section (21) part of the antenna coil (20).

Description

アンテナ装置および電子機器ANTENNA DEVICE AND ELECTRONIC DEVICE
　本発明は、アンテナ装置に関し、特に、アンテナコイルおよび給電コイルを備えるアンテナ装置に関する。また、本発明は、そのアンテナ装置を備える電子機器に関する。 The present invention relates to an antenna device, and more particularly, to an antenna device including an antenna coil and a feeding coil. The present invention also relates to an electronic apparatus including the antenna device.
　面に沿ったコイル導体で構成されるアンテナコイルと、このアンテナコイルに対して主に磁界結合する給電コイルを備えるアンテナ装置が特許文献１に示されている。図１０（Ａ）は特許文献１に示されているアンテナ装置の正面図、図１０（Ｂ）はその平面図である。回路基板５０には、給電回路が構成され、この給電回路が接続される給電コイル３０が搭載されている。アンテナコイル２０は給電コイル３０に近接配置されることにより、給電コイル３０はアンテナコイル２０と主に磁界結合する。 Patent Document 1 discloses an antenna device including an antenna coil formed of a coil conductor along a surface and a feeding coil that is mainly magnetically coupled to the antenna coil. 10A is a front view of the antenna device disclosed in Patent Document 1, and FIG. 10B is a plan view thereof. On the circuit board 50, a power feeding circuit is configured, and a power feeding coil 30 to which the power feeding circuit is connected is mounted. The antenna coil 20 is disposed close to the power supply coil 30, so that the power supply coil 30 is mainly magnetically coupled to the antenna coil 20.
　このように、給電コイル３０をアンテナコイル２０に磁界結合させることにより、フレキシブルケーブルやコンタクトピンを用いずに、アンテナコイルに給電回路を接続することができる。 In this way, by magnetically coupling the feeding coil 30 to the antenna coil 20, it is possible to connect the feeding circuit to the antenna coil without using a flexible cable or a contact pin.
国際公開第２０１２／１７３０８０号International Publication No. 2012/173080
　図１０に例示したアンテナ装置の構成においては、給電コイル３０とアンテナコイル２０とは、給電コイル３０のコイル開口およびアンテナコイル２０のコイル開口を貫く磁束φｎを介して磁界結合する。しかし、給電コイル３０のコイル開口を通過する磁束には、磁束φａで示すような、アンテナコイル２０との結合に寄与しない磁束が生じる場合がある。このように結合に寄与しない磁束が生じると、給電コイル３０とアンテナコイル２０との結合係数を充分に高められない。 In the configuration of the antenna device illustrated in FIG. 10, the feeding coil 30 and the antenna coil 20 are magnetically coupled via a magnetic flux φn penetrating the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20. However, the magnetic flux passing through the coil opening of the feeding coil 30 may generate a magnetic flux that does not contribute to the coupling with the antenna coil 20 as indicated by the magnetic flux φa. When magnetic flux that does not contribute to coupling is generated in this way, the coupling coefficient between the feeding coil 30 and the antenna coil 20 cannot be sufficiently increased.
　本発明の目的は、コイル導体で構成されるアンテナコイルと給電コイルとを備え、給電コイルとアンテナコイルとの結合係数を高めたアンテナ装置、およびそれを備えた電子機器を提供することにある。 An object of the present invention is to provide an antenna device that includes an antenna coil and a feeding coil made of a coil conductor, and has an increased coupling coefficient between the feeding coil and the antenna coil, and an electronic apparatus including the antenna device.
（１）本発明のアンテナ装置は、面に沿ったコイル導体で構成されるアンテナコイルと、前記アンテナコイルと磁界結合する位置に配置される給電コイルと、を備え、
　前記給電コイルに対して前記アンテナコイル側に配置され、平面視で、前記アンテナコイルの第１部の近傍に形成され、前記アンテナコイルの第１部から前記アンテナコイルの外側に拡がっており、前記アンテナコイルのコイル開口と重ならない領域を有する面状導体を備え、
　前記給電コイルは、前記アンテナコイルの第１部以外の第２部に少なくとも磁界結合する位置に配置されることを特徴とする。 (1) An antenna device of the present invention includes an antenna coil configured by a coil conductor along a surface, and a feeding coil disposed at a position where the antenna coil is magnetically coupled,
The antenna coil is disposed on the antenna coil side with respect to the feeding coil, and is formed in the vicinity of the first part of the antenna coil in a plan view, and extends from the first part of the antenna coil to the outside of the antenna coil. A planar conductor having a region that does not overlap with the coil opening of the antenna coil,
The feeding coil is disposed at a position at least magnetically coupled to a second part other than the first part of the antenna coil.
　上記構成により、給電コイルのコイル開口を通り且つアンテナコイルのコイル開口を通らないような磁束は面状導体で遮られる。このことで、給電コイルのコイル開口およびアンテナコイルのコイル開口を貫く磁束が相対的に増加し、給電コイルとアンテナコイルとの結合係数の高いアンテナ装置が得られる。 With the above configuration, magnetic flux that passes through the coil opening of the feeding coil and does not pass through the coil opening of the antenna coil is blocked by the planar conductor. Thus, the magnetic flux penetrating through the coil opening of the feeding coil and the coil opening of the antenna coil is relatively increased, and an antenna device having a high coupling coefficient between the feeding coil and the antenna coil is obtained.
（２）上記（１）において、前記アンテナコイルの第１部の少なくとも一部は、前記アンテナコイルのコイル軸を挟んで前記給電コイルと対向することが好ましい。これにより、給電コイルから視たアンテナコイルのコイル開口の実効的な面積が大きくなり、そのことで、給電コイルとアンテナコイルとの結合係数をより高めることができる。 (2) In the above (1), it is preferable that at least a part of the first part of the antenna coil is opposed to the feeding coil with a coil axis of the antenna coil interposed therebetween. Thereby, the effective area of the coil opening of the antenna coil viewed from the power supply coil is increased, and thereby the coupling coefficient between the power supply coil and the antenna coil can be further increased.
（３）上記（１）または（２）において、前記面状導体は第１辺を有し、前記アンテナコイルの第１部は前記面状導体の第１辺に沿って延伸し、前記給電コイルのコイル軸方向は、前記面状導体の第１辺に垂直方向である、ことが好ましい。これにより、面状導体による、結合に寄与しない磁束の発生をより効果的に防ぐことができ、そのことで、給電コイルとアンテナコイルとの結合係数を効果的に高めることができる。 (3) In the above (1) or (2), the planar conductor has a first side, the first part of the antenna coil extends along the first side of the planar conductor, and the feeding coil The coil axis direction is preferably perpendicular to the first side of the planar conductor. Thereby, generation | occurrence | production of the magnetic flux which does not contribute to coupling | bonding by a planar conductor can be prevented more effectively, and, thereby, the coupling coefficient of a feeding coil and an antenna coil can be raised effectively.
（４）上記（１）から（３）のいずれかにおいて、前記アンテナコイルのコイル軸方向に平面視したとき、前記給電コイルは前記アンテナコイルのコイル開口内または前記アンテナコイルの第２部に重なる、ことが好ましい。これにより、給電コイルの２つのコイル開口のうち一方のコイル開口とアンテナコイルのコイル開口とが近接するので、給電コイルのコイル開口およびアンテナコイルのコイル開口を貫く磁束が相対的に増加し、給電コイルとアンテナコイルとの結合係数の高いアンテナ装置が得られる。 (4) In any one of the above (1) to (3), when viewed in plan in the coil axis direction of the antenna coil, the feeding coil overlaps with the coil opening of the antenna coil or the second part of the antenna coil. Is preferable. As a result, one of the two coil openings of the feeding coil and the coil opening of the antenna coil are close to each other, so that the magnetic flux passing through the coil opening of the feeding coil and the coil opening of the antenna coil is relatively increased. An antenna device having a high coupling coefficient between the coil and the antenna coil can be obtained.
（５）上記（１）から（４）のいずれかにおいて、前記コイル導体は回路基板に形成された導体パターンであることが好ましい。これにより、コイル開口の大きなアンテナコイルを容易に配置でき、且つアンテナコイルに対して給電コイルを容易に近接配置できる。そのため、高効率のアンテナ特性が得られる。 (5) In any one of (1) to (4), the coil conductor is preferably a conductor pattern formed on a circuit board. Thereby, an antenna coil having a large coil opening can be easily arranged, and the feeding coil can be easily arranged close to the antenna coil. Therefore, highly efficient antenna characteristics can be obtained.
（６）上記（１）から（５）のいずれかにおいて、前記面状導体は回路基板に形成されたグランド導体であることが好ましい。これにより、面状導体を特別に設ける必要がなく、小型化が図れる。 (6) In any one of the above (1) to (5), the planar conductor is preferably a ground conductor formed on a circuit board. Thereby, it is not necessary to provide a planar conductor specially, and size reduction can be achieved.
（７）本発明の電子機器は、アンテナ装置と筐体を備え、
　前記アンテナ装置は、
　面に沿ったコイル導体で構成されるアンテナコイルと、
　前記アンテナコイルと磁界結合する位置に配置される給電コイルと、を備え、
　前記給電コイルに対して前記アンテナコイル側に配置され、平面視で、前記アンテナコイルの第１部の近傍に形成され、前記アンテナコイルの第１部から前記アンテナコイルの外側に拡がっており、前記アンテナコイルのコイル開口と重ならない領域を有する面状導体を備え、
　前記給電コイルは、前記アンテナコイルの第１部以外の第２部に少なくとも磁界結合する位置に配置される、ことを特徴とする。 (7) An electronic device of the present invention includes an antenna device and a housing,
The antenna device is
An antenna coil composed of a coil conductor along the surface;
A feeding coil disposed at a position where the antenna coil and a magnetic field are coupled,
The antenna coil is disposed on the antenna coil side with respect to the feeding coil, and is formed in the vicinity of the first part of the antenna coil in a plan view, and extends from the first part of the antenna coil to the outside of the antenna coil. A planar conductor having a region that does not overlap with the coil opening of the antenna coil,
The feeding coil is disposed at a position where it is at least magnetically coupled to a second part other than the first part of the antenna coil.
　上記構成により、給電コイルとアンテナコイルとの結合係数の高いアンテナ装置が構成され、高効率のアンテナ装置を備える電子機器が得られる。 With the above configuration, an antenna device having a high coupling coefficient between the feeding coil and the antenna coil is configured, and an electronic device including a highly efficient antenna device can be obtained.
（８）上記（７）において、前記筐体は導体部を有し、前記アンテナコイルは、前記筐体の導体部に接続される、ことが好ましい。これにより、筐体の導体部をアンテナコイルの一部に兼ねることができ、コイル開口の大きなアンテナコイルを構成しやすい。また、アンテナコイルは通信相手側アンテナとより近接するので、通信相手側アンテナとの結合係数が高まる。 (8) In the above (7), it is preferable that the housing has a conductor portion, and the antenna coil is connected to the conductor portion of the housing. Thereby, the conductor part of a housing | casing can serve as a part of antenna coil, and it is easy to comprise an antenna coil with a large coil opening. Further, since the antenna coil is closer to the communication partner antenna, the coupling coefficient with the communication partner antenna is increased.
（９）上記（７）において、前記面状導体は前記筐体の導体部であることが好ましい。これにより、筐体の導体部を面状導体に兼ねることができ、例えば回路基板への面状導体以外の導体パターンの配置自由度が高まる。 (9) In the above (7), the planar conductor is preferably a conductor portion of the casing. Thereby, the conductor part of a housing | casing can serve as a planar conductor, for example, the freedom degree of arrangement | positioning of conductor patterns other than the planar conductor to a circuit board increases.
　本発明によれば、給電コイルとアンテナコイルとの結合係数の高いアンテナ装置、およびそれを備えた電子機器が得られる。 According to the present invention, an antenna device having a high coupling coefficient between the feeding coil and the antenna coil, and an electronic apparatus including the antenna device can be obtained.
図１は第１の実施形態に係るアンテナ装置１０１の構成を示す平面図である。FIG. 1 is a plan view showing the configuration of the antenna device 101 according to the first embodiment. 図２（Ａ）は、アンテナ装置１０１のＡ－Ａ部分での断面図であり、図２（Ｂ）は、比較例としてのアンテナ装置１０１Ｐの断面図である。2A is a cross-sectional view taken along the line AA of the antenna device 101, and FIG. 2B is a cross-sectional view of an antenna device 101P as a comparative example. 図３（Ａ）～（Ｃ）は第２の実施形態に係るアンテナ装置１０２Ａ～１０２Ｃの断面図である。3A to 3C are cross-sectional views of the antenna devices 102A to 102C according to the second embodiment. 図４は第３の実施形態に係るアンテナ装置１０３の構成を示す平面図である。FIG. 4 is a plan view showing the configuration of the antenna device 103 according to the third embodiment. 図５は、アンテナ装置１０３のＡ－Ａ部分での断面図である。FIG. 5 is a cross-sectional view of the antenna device 103 taken along the line AA. 図６は第４の実施形態に係るアンテナ装置１０４の構成を示す平面図である。FIG. 6 is a plan view showing the configuration of the antenna device 104 according to the fourth embodiment. 図７は第５の実施形態に係るアンテナ装置１０５およびこのアンテナ装置１０５を備える電子機器２０５の構成を示す平面図である。FIG. 7 is a plan view showing a configuration of an antenna device 105 according to the fifth embodiment and an electronic apparatus 205 including the antenna device 105. 図８は、電子機器２０５の筐体の第１導体部１、第２導体部２および回路基板１００の構成を示す斜視図である。FIG. 8 is a perspective view illustrating the configuration of the first conductor portion 1, the second conductor portion 2, and the circuit board 100 of the housing of the electronic device 205. 図９（Ａ）は第２周波数帯でのアンテナ装置１０５の作用を示す等価回路図である。図９（Ｂ）は、第１周波数帯でのアンテナ装置１０５の作用を示す等価回路図である。FIG. 9A is an equivalent circuit diagram illustrating the operation of the antenna device 105 in the second frequency band. FIG. 9B is an equivalent circuit diagram illustrating the operation of the antenna device 105 in the first frequency band. 図１０（Ａ）は特許文献１に示されているアンテナ装置の正面図、図１０（Ｂ）はその平面図である。10A is a front view of the antenna device disclosed in Patent Document 1, and FIG. 10B is a plan view thereof.
　以降、図を参照して幾つかの具体的な例を挙げて、本発明を実施するための複数の形態を示す。各図中には同一箇所に同一符号を付している。要点の説明または理解の容易性を考慮して、便宜上実施形態を分けて示すが、異なる実施形態で示した構成の部分的な置換または組み合わせが可能である。第２の実施形態以降では第１の実施形態と共通の事柄についての記述を省略し、異なる点についてのみ説明する。特に、同様の構成による同様の作用効果については実施形態毎には逐次言及しない。 Hereinafter, several specific examples will be given with reference to the drawings to show a plurality of modes for carrying out the present invention. In each figure, the same reference numerals are assigned to the same portions. In consideration of ease of explanation or understanding of the main points, the embodiments are shown separately for convenience, but the components shown in different embodiments can be partially replaced or combined. In the second and subsequent embodiments, description of matters common to the first embodiment is omitted, and only different points will be described. In particular, the same operation effect by the same configuration will not be sequentially described for each embodiment.
　以降で示す各実施形態において、「定在波型アンテナ」とは、放射素子上で電流や電圧（電位）の定在波が生じるアンテナである。すなわち、放射素子上に電流や電圧（電位）の強度の節や腹が生じるように共振する。例えば、放射素子上の電流や電圧（電位）の境界条件のため、放射素子の端部で電流が０となり、グランドに接続される場合はグランドとの接続部で電圧が０となる。代表的な定在波アンテナとしては、ダイポールアンテナ、モノポールアンテナ、逆Ｌ型アンテナ、逆Ｆ型アンテナ（IFA）、１波長ループアンテナ、折り返しダイポールアンテナ、折り返しモノポールアンテナ、マイクロストリップアンテナ、パッチアンテナ、板状逆Ｆ型アンテナ（PIFA）、スロットアンテナ、ノッチアンテナ、各アンテナの亜種（放射素子が複数並列につながっていたり、スタブが複数あったり、放射素子の形が場所によって変わったりなど）である。 In the embodiments described below, the “standing wave antenna” is an antenna that generates a standing wave of current or voltage (potential) on the radiating element. That is, resonance occurs so that nodes and antinodes of current and voltage (potential) strength are generated on the radiating element. For example, due to the boundary conditions of the current and voltage (potential) on the radiating element, the current becomes 0 at the end of the radiating element, and when connected to the ground, the voltage becomes 0 at the connection with the ground. Typical standing wave antennas include dipole antenna, monopole antenna, inverted L-type antenna, inverted F-type antenna (IFA), one-wavelength loop antenna, folded dipole antenna, folded monopole antenna, microstrip antenna, patch antenna , Plate inverted F type antenna (PIFA), slot antenna, notch antenna, subtypes of each antenna (multiple radiating elements connected in parallel, multiple stubs, radiating element shape changes depending on location, etc.) It is.
　定在波型アンテナは遠方界において、電磁波（電波）による通信のために用いられる。例えば携帯電話端末における通話やデータ通信、無線LANの通信、GPSにおける衛星信号の受信等に利用される。 A standing wave antenna is used for communication by electromagnetic waves (radio waves) in the far field. For example, it is used for telephone calls and data communication in mobile phone terminals, wireless LAN communication, satellite signal reception in GPS, and the like.
　また、以降で示す各実施形態において、「磁界型アンテナ」とは、微小ループアンテナの一種であり、磁束を放射するアンテナである。 In each of the embodiments described below, the “magnetic field antenna” is a kind of minute loop antenna and is an antenna that radiates magnetic flux.
　磁界型アンテナは、近傍界において、磁界結合による通信のために用いられる。例えば、NFC（Near field communication）等の通信に利用される。 Magnetic field type antenna is used for communication by magnetic field coupling in the near field. For example, it is used for communication such as NFC (Near field communication).
　また、以降で示す各実施形態において、「磁界型アンテナ」であるアンテナ装置は、例えばHF帯で使用され、特に13.56MHzまたは13.56MHz近傍の周波数で用いられる。アンテナ装置の大きさは、使用する周波数における波長λに比べて十分に小さく、使用周波数帯においては電磁波の放射特性は悪い。後述のアンテナ装置が備えるアンテナコイルのコイル導体の長さはλ/10以下である。なお、ここでいう波長とは、アンテナが形成される基材の誘電性や透磁性による波長短縮効果を考慮した実効的な波長のことを指す。アンテナコイルが有するコイル導体は、使用周波数帯（HF帯、特に13.56MHz近傍）を操作する給電回路に電気的に接続される。 In each of the embodiments described below, an antenna device that is a “magnetic antenna” is used, for example, in the HF band, and is particularly used at a frequency near 13.56 MHz or 13.56 MHz. The size of the antenna device is sufficiently smaller than the wavelength λ at the used frequency, and the radiation characteristics of electromagnetic waves are poor in the used frequency band. The length of the coil conductor of the antenna coil provided in the antenna device described later is λ / 10 or less. In addition, the wavelength here refers to the effective wavelength in consideration of the wavelength shortening effect by the dielectric property and permeability of the base material on which the antenna is formed. A coil conductor included in the antenna coil is electrically connected to a power feeding circuit that operates a used frequency band (HF band, particularly around 13.56 MHz).
　本発明における「電子機器」は、上記定在波型アンテナおよび磁界型アンテナを備える装置である。例えば、携帯電話端末、いわゆるスマートフォン、タブレット端末、ノートPC、ウェアラブル端末（いわゆるスマートウォッチやスマートグラス等）である。 The “electronic device” in the present invention is a device including the standing wave antenna and the magnetic field antenna. For example, it is a mobile phone terminal, so-called smart phone, tablet terminal, notebook PC, wearable terminal (so-called smart watch, smart glass, etc.).
《第１の実施形態》
　図１は第１の実施形態に係るアンテナ装置１０１の構成を示す平面図である。図２（Ａ）は、アンテナ装置１０１のＡ－Ａ部分での断面図であり、図２（Ｂ）は、比較例としてのアンテナ装置１０１Ｐの断面図である。 << First Embodiment >>
FIG. 1 is a plan view showing the configuration of the antenna device 101 according to the first embodiment. 2A is a cross-sectional view taken along the line AA of the antenna device 101, and FIG. 2B is a cross-sectional view of an antenna device 101P as a comparative example.
　アンテナ装置１０１は、アンテナコイル２０と給電コイル３０とを備える。アンテナコイル２０は、回路基板１００の内部（内層）に形成され、回路基板１００の面に沿った複数ターンのコイル導体２０Ｃで構成される。 The antenna device 101 includes an antenna coil 20 and a feeding coil 30. The antenna coil 20 is formed in the inside (inner layer) of the circuit board 100 and includes a coil conductor 20 </ b> C having a plurality of turns along the surface of the circuit board 100.
　給電コイル３０は、磁性体層の積層による積層体に導体パターンによるヘリカル状のコイルが構成されたものである。アンテナコイル２０のコイル軸２０ＡＸ方向に平面視したとき、給電コイル３０はアンテナコイル２０の近傍に配置される。すなわち、給電コイル３０の上記ヘリカル状のコイルがアンテナコイル２０と主に磁界結合するように、回路基板１００上においてアンテナコイル２０の近傍に実装されている。特に給電コイル３０がアンテナコイル２０のコイル開口２０Ａ内またはアンテナコイル２０の第２部２２に重なる位置に配置されることにより、給電コイル３０の上記ヘリカル状のコイルがアンテナコイル２０と強く磁界結合できる。 The feeding coil 30 is formed by forming a helical coil with a conductor pattern on a laminated body of laminated magnetic layers. When viewed in plan in the direction of the coil axis 20AX of the antenna coil 20, the feeding coil 30 is disposed in the vicinity of the antenna coil 20. That is, the helical coil of the feeding coil 30 is mounted on the circuit board 100 in the vicinity of the antenna coil 20 so as to be magnetically coupled to the antenna coil 20 mainly. In particular, the helical coil of the feeding coil 30 can be strongly magnetically coupled to the antenna coil 20 by arranging the feeding coil 30 in the coil opening 20 </ b> A of the antenna coil 20 or at a position overlapping the second portion 22 of the antenna coil 20. .
　なお、アンテナコイル２０は、回路基板１００のできる限り端部寄りに配置されることが好ましい。そのことでアンテナコイル２０が通信相手とより近づくため、通信特性（結合）が良くなる。このことは以降で示す別の実施形態においても同様である。 The antenna coil 20 is preferably arranged as close to the end of the circuit board 100 as possible. As a result, the antenna coil 20 is closer to the communication partner, and communication characteristics (coupling) are improved. The same applies to other embodiments described below.
　回路基板１００には共振用キャパシタ８が実装されていて、この共振用キャパシタ８がコイル導体２０Ｃの両端に接続されている。したがって、アンテナコイル２０と共振用キャパシタ８とでＬＣ直列共振回路が構成される。 A resonance capacitor 8 is mounted on the circuit board 100, and the resonance capacitor 8 is connected to both ends of the coil conductor 20C. Therefore, an LC series resonance circuit is configured by the antenna coil 20 and the resonance capacitor 8.
　回路基板１００にはＲＦＩＣ等による給電回路９が設けられていて、この給電回路９が給電コイル３０に接続されている。 The circuit board 100 is provided with a power supply circuit 9 such as an RFIC, and the power supply circuit 9 is connected to the power supply coil 30.
　回路基板１００の裏面には、例えばグランド導体である面状導体１０が形成されている。面状導体１０が形成されている領域がグランド領域ＧＡ、面状導体１０が形成されていない領域が非グランド領域ＮＧＡである。 The planar conductor 10 which is a ground conductor, for example, is formed on the back surface of the circuit board 100. A region where the planar conductor 10 is formed is a ground region GA, and a region where the planar conductor 10 is not formed is a non-ground region NGA.
　面状導体１０はアンテナコイル２０の第１部２１の近傍に配置されている。特に、本実施形態では、アンテナコイル２０の第１部２１は、平面視で、面状導体１０と重なる。給電コイル３０は、アンテナコイル２０の第１部２１以外である第２部２２に少なくとも磁界結合する位置に配置されている。図２（Ａ）に示されているように、給電コイル３０のコイル開口およびアンテナコイル２０のコイル開口を貫く磁束φｎを介して、給電コイル３０はアンテナコイル２０と磁界結合する。 The planar conductor 10 is disposed in the vicinity of the first portion 21 of the antenna coil 20. In particular, in the present embodiment, the first portion 21 of the antenna coil 20 overlaps the planar conductor 10 in plan view. The feeding coil 30 is disposed at a position at least magnetically coupled to the second portion 22 other than the first portion 21 of the antenna coil 20. As shown in FIG. 2A, the feeding coil 30 is magnetically coupled to the antenna coil 20 through a magnetic flux φn that passes through the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20.
　なお、本発明において、アンテナコイル２０の第１部２１の「近傍」とは、平面視で、アンテナコイル２０の大きさ以下の距離範囲である。 In the present invention, the “vicinity” of the first portion 21 of the antenna coil 20 is a distance range equal to or smaller than the size of the antenna coil 20 in plan view.
　図１に示すように、面状導体１０は、アンテナコイル２０の第１部２１と重なる部分の寸法Ｌ１１と、アンテナコイル２０の第１部２１と重ならない部分の寸法Ｌ１２とを比較すると、Ｌ１２＞Ｌ１１の関係にある。すなわち、面状導体１０は、アンテナコイル２０の第１部２１からアンテナコイル２０の外側へ拡がっている。これにより、面状導体による、結合に寄与しない磁束の発生が防止され、そのことで、給電コイル３０とアンテナコイル２０との結合係数を効果的に高めることができる。 As shown in FIG. 1, when the planar conductor 10 compares the dimension L11 of the portion that overlaps the first portion 21 of the antenna coil 20 with the dimension L12 of the portion that does not overlap the first portion 21 of the antenna coil 20, L12 > L11. That is, the planar conductor 10 extends from the first portion 21 of the antenna coil 20 to the outside of the antenna coil 20. Thereby, generation | occurrence | production of the magnetic flux which does not contribute to a coupling | bonding by a planar conductor is prevented, and it can raise the coupling coefficient of the feeding coil 30 and the antenna coil 20 effectively.
　給電コイル３０のコイル開口を通過する磁束のうち面状導体１０と交わる磁束またはアンテナコイル２０の第１部２１による磁束が面状導体１０と交わると、面状導体１０に渦電流が生じる。そのため、磁束は面状導体１０にまで拡がり難く、図２（Ａ）において磁束φａで示すような、アンテナコイル２０との結合に寄与しない磁束が生じ難く、磁束はアンテナコイル２０の第２部２２（コイル開口２０Ａ）を効率よく貫く。このことにより、面状導体１０が無い場合に比べて、給電コイル３０とアンテナコイル２０との結合係数が向上する。 When the magnetic flux passing through the coil opening of the feeding coil 30 intersects the planar conductor 10 or the magnetic flux generated by the first portion 21 of the antenna coil 20 intersects the planar conductor 10, an eddy current is generated in the planar conductor 10. Therefore, the magnetic flux does not easily spread to the planar conductor 10, and a magnetic flux that does not contribute to the coupling with the antenna coil 20, as indicated by the magnetic flux φa in FIG. The coil opening 20A is penetrated efficiently. As a result, the coupling coefficient between the feeding coil 30 and the antenna coil 20 is improved as compared with the case where the planar conductor 10 is not provided.
　本実施形態では、図１に示すように、アンテナコイル２０の第１部２１の少なくとも一部は、アンテナコイル２０のコイル軸２０ＡＸを挟んで給電コイル３０と対向する。これにより、給電コイル３０から視たアンテナコイル２０のコイル開口２０Ａの実効的な面積が大きくなり、そのことで、給電コイル３０とアンテナコイル２０との結合係数をより高めることができる。 In the present embodiment, as shown in FIG. 1, at least a part of the first portion 21 of the antenna coil 20 faces the feeding coil 30 with the coil axis 20AX of the antenna coil 20 interposed therebetween. As a result, the effective area of the coil opening 20A of the antenna coil 20 viewed from the power supply coil 30 is increased, whereby the coupling coefficient between the power supply coil 30 and the antenna coil 20 can be further increased.
　また、本実施形態では、面状導体１０は第１辺１０Ｓを有し、アンテナコイル２０の第１部２１は面状導体１０の第１辺１０Ｓに沿って延伸している。給電コイル３０のコイル軸３０ＡＸ方向は、面状導体１０の第１辺１０Ｓに対し実質的に垂直方向である。これにより、面状導体１０による、結合に寄与しない磁束φａの発生が効果的に防止され、そのことで、給電コイル３０とアンテナコイル２０との結合係数を効果的に高めることができる。 In the present embodiment, the planar conductor 10 has the first side 10 </ b> S, and the first portion 21 of the antenna coil 20 extends along the first side 10 </ b> S of the planar conductor 10. The direction of the coil axis 30AX of the feeding coil 30 is substantially perpendicular to the first side 10S of the planar conductor 10. Thereby, generation | occurrence | production of the magnetic flux (phi) a which does not contribute to a coupling | bonding by the planar conductor 10 is prevented effectively, and it can raise the coupling coefficient of the feeding coil 30 and the antenna coil 20 effectively.
　また、少なくとも給電コイル３０の中心を含む平面（図２（Ａ）における平面３０Ｓ）に対して、その平面３０Ｓを境に一方側（図２（Ａ）に示す例では下側）にアンテナコイル２０と面状導体１０との両方が配置されることにより、給電コイル３０とアンテナコイル２０との結合係数を効果的に高めることができる。比較例として挙げた図２（Ｂ）に示すアンテナ装置１０１Ｐにおいては、給電コイル３０の中心を含む平面３０Ｓに対して、その平面３０Ｓを境に一方側（図２（Ｂ）に示す例では下側）にアンテナコイル２０、上側に面状導体１０がそれぞれ配置されている。この比較例のアンテナ装置１０１Ｐでは、結合に寄与しない磁束φａの発生防止効果が殆ど無く、給電コイル３０とアンテナコイル２０との結合係数の向上効果は殆ど無い。 Further, with respect to a plane including at least the center of the feeding coil 30 (plane 30S in FIG. 2A), the antenna coil 20 on one side (lower side in the example shown in FIG. 2A) with the plane 30S as a boundary. And the planar conductor 10 are both arranged, the coupling coefficient between the feeding coil 30 and the antenna coil 20 can be effectively increased. In the antenna device 101P shown as a comparative example in FIG. 2B, the plane 30S including the center of the feeding coil 30 is one side of the plane 30S as a boundary (in the example shown in FIG. The antenna coil 20 is disposed on the upper side, and the planar conductor 10 is disposed on the upper side. In the antenna device 101P of this comparative example, there is almost no effect of preventing the generation of the magnetic flux φa that does not contribute to coupling, and there is almost no effect of improving the coupling coefficient between the feeding coil 30 and the antenna coil 20.
　本実施形態では、アンテナコイル２０は回路基板１００の内部（内層）に形成されているが、回路基板１００の表面や裏面に形成されていてもよい。また、アンテナコイル２０は回路基板１００に構成されているものだけでなく、フレキシブル基材にコイルパターンを形成したり、導電性のワイヤー等で構成されたりしてもよい。 In this embodiment, the antenna coil 20 is formed inside (inner layer) of the circuit board 100, but may be formed on the front surface or the back surface of the circuit board 100. Further, the antenna coil 20 may be formed not only on the circuit board 100 but also on a flexible base material, or may be formed of a conductive wire or the like.
　本実施形態では、面状導体１０は回路基板１００の内部（内層）に形成されているが、回路基板１００の表面や裏面に形成されていてもよい。また、面状導体１０は回路基板１００に構成されているものだけでなく、例えばアンテナ装置１０１を含む筐体内に配置されたバッテリーパックやシールド、筐体が導電性を有する場合には筐体等を面状導体１０として代替してもよい。 In the present embodiment, the planar conductor 10 is formed inside (inner layer) of the circuit board 100, but may be formed on the front surface or the back surface of the circuit board 100. In addition, the planar conductor 10 is not limited to the one configured on the circuit board 100, for example, a battery pack or a shield disposed in a casing including the antenna device 101, and a casing or the like when the casing has conductivity. May be substituted as the planar conductor 10.
　本実施形態では、面状導体１０はグランド導体となっているが、必ずしもグランド導体である必要はない。またグランドに接続される必要はない。本実施形態の、結合に寄与しない磁束の発生が防止効果に関しては面状導体１０の電位は殆ど関係ない。しかし、面状導体１０がグランド電位であれば、面状導体１０からの不要な電磁界ノイズの発生を抑えることができる。 In the present embodiment, the planar conductor 10 is a ground conductor, but is not necessarily a ground conductor. It is not necessary to connect to the ground. The potential of the planar conductor 10 is almost irrelevant with respect to the effect of preventing the generation of magnetic fluxes that do not contribute to coupling in this embodiment. However, if the planar conductor 10 is at ground potential, generation of unnecessary electromagnetic noise from the planar conductor 10 can be suppressed.
　なお、平面視で面状導体１０はアンテナコイル２０のコイル開口と重ならないことが好ましい。面状導体１０がアンテナコイル２０のコイル開口と重なると、給電コイル３０とアンテナコイル２０の磁界結合を阻害してしまう。少なくとも平面視でアンテナコイル２０のコイル開口において、面状導体１０とアンテナコイル２０のコイル開口とが重ならない領域がコイル開口の１／３以上であれば、給電コイル３０とアンテナコイル２０は十分に磁界結合する。 In addition, it is preferable that the planar conductor 10 does not overlap with the coil opening of the antenna coil 20 in plan view. If the planar conductor 10 overlaps the coil opening of the antenna coil 20, the magnetic coupling between the feeding coil 30 and the antenna coil 20 is hindered. If the area where the planar conductor 10 and the coil opening of the antenna coil 20 do not overlap at least 1/3 of the coil opening in the coil opening of the antenna coil 20 at least in plan view, the feeding coil 30 and the antenna coil 20 are sufficiently Magnetic field coupling.
　なお、アンテナコイル２０と面状導体１０が同一の回路基板１００（多層になっている場合も含む）に形成されていることにより、アンテナコイル２０と面状導体１０をより近接させることができるため、アンテナコイル２０と面状導体１０との間を通る、給電コイル３０とアンテナコイル２０との結合に寄与しない、磁束の発生を防ぐことができる。 In addition, since the antenna coil 20 and the planar conductor 10 are formed on the same circuit board 100 (including the case where the antenna coil 20 has a multilayer structure), the antenna coil 20 and the planar conductor 10 can be brought closer to each other. The generation of magnetic flux that does not contribute to the coupling between the feeding coil 30 and the antenna coil 20 that passes between the antenna coil 20 and the planar conductor 10 can be prevented.
《第２の実施形態》
　第２の実施形態では、第１の実施形態に比べてアンテナコイルの構造が異なる幾つかのアンテナ装置について示す。 << Second Embodiment >>
In the second embodiment, several antenna devices having different antenna coil structures compared to the first embodiment will be described.
　図３（Ａ）～（Ｃ）はアンテナ装置１０２Ａ～１０２Ｃの断面図である。いずれも、第１の実施形態で図２に示した断面図に対応する位置での断面図である。 3A to 3C are cross-sectional views of the antenna devices 102A to 102C. Both are cross-sectional views at positions corresponding to the cross-sectional view shown in FIG. 2 in the first embodiment.
　図３（Ａ）のアンテナ装置１０２Ａでは、アンテナコイル２０は、回路基板１００の内部に複数層に亘って、回路基板１００の面に沿った複数ターンのコイル導体２０Ｃで構成されている。コイル導体２０Ｃ以外の構成は、図２に示したアンテナ装置１０１と同じである。このように、アンテナコイルは複数層に亘るコイル導体２０Ｃで構成されてもよい。このことで、限られた面積で所定インダクタンスのアンテナコイルが構成できる。 In the antenna device 102A of FIG. 3A, the antenna coil 20 is configured by a coil conductor 20C having a plurality of turns along the surface of the circuit board 100 across a plurality of layers inside the circuit board 100. The configuration other than the coil conductor 20C is the same as that of the antenna device 101 shown in FIG. As described above, the antenna coil may be configured by the coil conductor 20C extending over a plurality of layers. Thus, an antenna coil having a predetermined inductance can be configured with a limited area.
　図３（Ｂ）のアンテナ装置１０２Ｂでは、面状導体１０Ａ，１０Ｂが基板１００の両面に形成されている。面状導体１０Ａ，１０Ｂ以外の構成は、図２に示したアンテナ装置１０１と同じである。このように、面状導体は複数の層に形成されていてもよい。また、アンテナコイル２０の第１部２１を複数の面状導体１０Ａ，１０Ｂの間に配置してもよい。このことで、結合に寄与しない磁束が面状導体でより確実に遮られる。 3B, planar conductors 10A and 10B are formed on both surfaces of the substrate 100. In the antenna device 102B shown in FIG. The configuration other than the planar conductors 10A and 10B is the same as that of the antenna device 101 shown in FIG. Thus, the planar conductor may be formed in a plurality of layers. Moreover, you may arrange | position the 1st part 21 of the antenna coil 20 between several planar conductor 10A, 10B. Thus, the magnetic flux that does not contribute to the coupling is more reliably blocked by the planar conductor.
　図３（Ｃ）のアンテナ装置１０２Ｃでは、面状導体１０が給電コイル３０の実装面に形成されている。面状導体１０以外の構成は、図２に示したアンテナ装置１０１と同じである。このように、面状導体１０がアンテナコイル２０の第１部２１より給電コイル３０に近い側の位置に配置されていてもよい。このことで、アンテナコイル２０と面状導体１０との間を通る、給電コイル３０とアンテナコイル２０の結合に寄与しない、磁束の発生を防ぐことができる。 In the antenna device 102 </ b> C of FIG. 3C, the planar conductor 10 is formed on the mounting surface of the feeding coil 30. The configuration other than the planar conductor 10 is the same as that of the antenna device 101 shown in FIG. Thus, the planar conductor 10 may be disposed at a position closer to the feeding coil 30 than the first portion 21 of the antenna coil 20. Accordingly, it is possible to prevent the generation of magnetic flux that does not contribute to the coupling between the feeding coil 30 and the antenna coil 20 that passes between the antenna coil 20 and the planar conductor 10.
《第３の実施形態》
　第３の実施形態では、第１の実施形態に比べてアンテナコイルの位置および面状導体の構成が異なるアンテナ装置について示す。 << Third Embodiment >>
In the third embodiment, an antenna device in which the position of the antenna coil and the configuration of the planar conductor are different from those in the first embodiment will be described.
　図４は第３の実施形態に係るアンテナ装置１０３の構成を示す平面図である。図５は、アンテナ装置１０３のＡ－Ａ部分での断面図である。 FIG. 4 is a plan view showing the configuration of the antenna device 103 according to the third embodiment. FIG. 5 is a cross-sectional view of the antenna device 103 taken along the line AA.
　アンテナ装置１０３のアンテナコイル２０は、回路基板１００の第２面Ｓ２に形成され、回路基板１００の第２面に沿った複数ターンのコイル導体２０Ｃで構成されている。また、グランド導体である面状導体１０Ｍ，１０Ｎも回路基板１００の第２面Ｓ２に形成されている。 The antenna coil 20 of the antenna device 103 is formed on the second surface S <b> 2 of the circuit board 100, and is configured by a multi-turn coil conductor 20 </ b> C along the second surface of the circuit board 100. Further, planar conductors 10M and 10N that are ground conductors are also formed on the second surface S2 of the circuit board 100.
　面状導体１０Ｍ，１０Ｎが形成されているグランド領域ＧＡには、面状導体１０Ｍ，１０Ｎとアンテナコイル２０の第１部２１との絶縁状態を保つための不連続部ＤＳが形成されていて、この不連続部ＤＳにアンテナコイル２０の第１部２１が形成されている。 In the ground region GA where the planar conductors 10M and 10N are formed, a discontinuous portion DS for maintaining an insulation state between the planar conductors 10M and 10N and the first portion 21 of the antenna coil 20 is formed. The first portion 21 of the antenna coil 20 is formed in the discontinuous portion DS.
　図４に示すように、共振用キャパシタ８は回路基板１００の非グランド領域ＮＧＡに実装されている。その他の構成は、図１に示したアンテナ装置１０１と同じである。 As shown in FIG. 4, the resonance capacitor 8 is mounted on the non-ground region NGA of the circuit board 100. Other configurations are the same as those of the antenna device 101 shown in FIG.
　アンテナコイル２０と面状導体１０Ｍ，１０Ｎとが平面視で重ならないように配置することにより、面状導体１０Ｍ，１０Ｎを配置したことによるアンテナコイル２０のインダクタンスの変動を抑えることができる。また、アンテナコイル２０と面状導体１０Ｍ，１０Ｎが同一平面状に形成されることにより、アンテナ装置１０３をより薄く構成することができる。 By arranging the antenna coil 20 and the planar conductors 10M and 10N so as not to overlap in a plan view, fluctuations in the inductance of the antenna coil 20 due to the arrangement of the planar conductors 10M and 10N can be suppressed. Further, the antenna device 103 can be made thinner by forming the antenna coil 20 and the planar conductors 10M and 10N on the same plane.
　また、第１の面状導体１０Ｍと第２の面状導体１０Ｎを回路基板内部（内層）等に形成する配線により導通させてもよい。それにより第１の面状導体１０Ｍと第２の面状導体１０Ｎが同電位となり、第１の面状導体１０Ｍまたは第２の面状導体１０Ｎからの不要な電磁界ノイズの発生を抑えることができる。また第２の面状導体１０Ｎに関しても回路基板上の実装部品等のグランドとして用いることができる。 Alternatively, the first planar conductor 10M and the second planar conductor 10N may be made conductive by wiring formed inside the circuit board (inner layer) or the like. As a result, the first planar conductor 10M and the second planar conductor 10N have the same potential, and generation of unnecessary electromagnetic noise from the first planar conductor 10M or the second planar conductor 10N can be suppressed. it can. Further, the second planar conductor 10N can also be used as a ground for mounting components on the circuit board.
　なお、給電コイル３０とアンテナコイル２０の磁界結合を阻害させないために、第２の面状導体１０Ｎを取り除いた構成としてもよい。その場合には、面状導体１０Ｍがアンテナコイル２０の第１部２１の近傍に配置される関係となる。 It should be noted that the second planar conductor 10N may be removed so as not to disturb the magnetic field coupling between the feeding coil 30 and the antenna coil 20. In that case, the planar conductor 10 </ b> M is disposed in the vicinity of the first portion 21 of the antenna coil 20.
《第４の実施形態》
　第４の実施形態では、アンテナコイル２０に対する給電コイル３０の位置関係が第１の実施形態とは異なるアンテナ装置について示す。 << Fourth Embodiment >>
In the fourth embodiment, an antenna device in which the positional relationship of the feeding coil 30 with respect to the antenna coil 20 is different from that in the first embodiment will be described.
　図６は第４の実施形態に係るアンテナ装置１０４の構成を示す平面図である。アンテナコイル２０の第１部２１は、平面視で、面状導体１０と重なる。給電コイル３０は、アンテナコイル２０の第２部２２に少なくとも磁界結合する位置に配置されている。図６に示されているように、給電コイル３０のコイル開口およびアンテナコイル２０のコイル開口を貫く磁束φｎを介して、給電コイル３０とアンテナコイル２０とは磁界結合する。 FIG. 6 is a plan view showing the configuration of the antenna device 104 according to the fourth embodiment. The first portion 21 of the antenna coil 20 overlaps the planar conductor 10 in plan view. The feeding coil 30 is disposed at a position at least magnetically coupled to the second portion 22 of the antenna coil 20. As shown in FIG. 6, the feeding coil 30 and the antenna coil 20 are magnetically coupled via a magnetic flux φn that passes through the coil opening of the feeding coil 30 and the coil opening of the antenna coil 20.
　本実施形態のように、アンテナコイル２０の第１部２１がアンテナコイル２０のコイル軸２０ＡＸを挟んで給電コイル３０と対向しない位置であっても、また、給電コイル３０のコイル軸方向が面状導体１０の第１辺１０Ｓに対し垂直方向でない場合でも、面状導体１０は、結合に寄与しない磁束の発生を防ぐ。給電コイル３０とアンテナコイル２０との位置関係によっては、通信相手側アンテナとアンテナコイル２０との磁界結合を相殺するように通信相手側アンテナと給電コイル３０が磁界結合してしまい、通信相手側アンテナとアンテナ装置１０４との結合係数が低下する場合がある。よって、給電コイル３０とアンテナコイル２０との位置関係を選ぶことで、特定の位置においてより通信特性がよいアンテナ装置１０４を構成することができる。 As in the present embodiment, even if the first portion 21 of the antenna coil 20 is located at a position where the first coil 21 of the antenna coil 20 is not opposed to the power supply coil 30 across the coil axis 20AX, the coil axis direction of the power supply coil 30 is planar. Even when the direction is not perpendicular to the first side 10 </ b> S of the conductor 10, the planar conductor 10 prevents generation of magnetic flux that does not contribute to coupling. Depending on the positional relationship between the feeding coil 30 and the antenna coil 20, the communicating party antenna and the feeding coil 30 are magnetically coupled so as to cancel the magnetic field coupling between the communicating party antenna and the antenna coil 20. And the antenna device 104 may be reduced in coupling coefficient. Therefore, by selecting the positional relationship between the feeding coil 30 and the antenna coil 20, the antenna device 104 with better communication characteristics can be configured at a specific position.
　なお、以上に示した各実施形態では、給電コイル３０のコイル軸３０ＡＸの方向がアンテナコイル２０のコイル開口と平行である例を示したが、本発明はこれに限らない。例えば、給電コイル３０のコイル軸３０ＡＸの方向とアンテナコイル２０のコイル軸２０ＡＸの方向とは実質的に平行であってもよい。 In each of the embodiments described above, an example in which the direction of the coil axis 30AX of the power feeding coil 30 is parallel to the coil opening of the antenna coil 20 is shown, but the present invention is not limited to this. For example, the direction of the coil axis 30AX of the feeding coil 30 and the direction of the coil axis 20AX of the antenna coil 20 may be substantially parallel.
《第５の実施形態》
　第５の実施形態では、本発明のアンテナ装置およびそれを備える電子機器の構成例について示す。また、本実施形態では、磁界型アンテナと定在波型アンテナを備える電子機器の構成例を示す。 << Fifth Embodiment >>
In the fifth embodiment, a configuration example of the antenna device of the present invention and an electronic apparatus including the antenna device will be described. In this embodiment, a configuration example of an electronic device including a magnetic field antenna and a standing wave antenna is shown.
　図７は第５の実施形態に係るアンテナ装置１０５およびこのアンテナ装置１０５を備える電子機器２０５の構成を示す平面図である。図８は、電子機器２０５の筐体の第１導体部１、第２導体部２および回路基板１００の構成を示す斜視図である。 FIG. 7 is a plan view showing a configuration of an antenna device 105 according to the fifth embodiment and an electronic apparatus 205 including the antenna device 105. FIG. 8 is a perspective view illustrating the configuration of the first conductor portion 1, the second conductor portion 2, and the circuit board 100 of the housing of the electronic device 205.
　電子機器２０５は例えばいわゆるスマートフォンやタブレット端末等の、通信機能を有する携帯電子機器である。 The electronic device 205 is a portable electronic device having a communication function, such as a so-called smartphone or tablet terminal.
　電子機器２０５の筐体は第１導体部１と第２導体部２を有する。図７では、筐体の第１導体部１および第２導体部２以外の部分（例えば樹脂部分）については図示を省略している。第１導体部１および第２導体部２は、例えば陽極酸化処理されたアルミニウム板等の金属板の成型体である。第１導体部１はＺ方向に平行な三面を有し、第２導体部２はＹ方向に平行な三面を有する。筐体の内部には回路基板１００が設けられている。図７に示す例では、回路基板１００に形成される回路と筐体の第１導体部１とでアンテナ装置１０５が構成される。本実施形態において、筐体の第２導体部２は面状導体の一例である。また、筐体の第１導体部１はアンテナコイルの一部である。 The housing of the electronic device 205 has a first conductor portion 1 and a second conductor portion 2. In FIG. 7, illustrations of portions (for example, resin portions) other than the first conductor portion 1 and the second conductor portion 2 of the housing are omitted. The first conductor portion 1 and the second conductor portion 2 are molded bodies of a metal plate such as an anodized aluminum plate, for example. The first conductor portion 1 has three surfaces parallel to the Z direction, and the second conductor portion 2 has three surfaces parallel to the Y direction. A circuit board 100 is provided inside the housing. In the example illustrated in FIG. 7, the antenna device 105 is configured by a circuit formed on the circuit board 100 and the first conductor portion 1 of the housing. In this embodiment, the 2nd conductor part 2 of a housing | casing is an example of a planar conductor. The first conductor portion 1 of the housing is a part of the antenna coil.
　回路基板１００には、給電回路９、給電コイル３０、コイル導体２０Ｃ、第１周波数帯遮断素子７Ａ，７Ｂ、共振用キャパシタ８等が設けられている。アンテナコイル２０の第１部２１は、平面視で、筐体の第２導体部２と重なる。コイル導体２０Ｃの第１端は第１周波数帯遮断素子７Ａおよび接続導体４１を介して第１導体部１の接続箇所Ｐ１に接続されている。また、コイル導体２０Ｃの第２端は接地されている。第１周波数帯遮断素子７Ｂと共振用キャパシタ８の直列回路の一端は接続導体４２を介して第１導体部１の接続箇所Ｐ２に接続されている。他端は接地されている。上記接続導体４１，４２は例えば可動型プローブピンや導電性ネジ等である。 The circuit board 100 is provided with a power supply circuit 9, a power supply coil 30, a coil conductor 20C, first frequency band cutoff elements 7A and 7B, a resonance capacitor 8, and the like. The first portion 21 of the antenna coil 20 overlaps the second conductor portion 2 of the housing in plan view. The first end of the coil conductor 20 </ b> C is connected to the connection location P <b> 1 of the first conductor portion 1 via the first frequency band cutoff element 7 </ b> A and the connection conductor 41. The second end of the coil conductor 20C is grounded. One end of the series circuit of the first frequency band cut-off element 7B and the resonance capacitor 8 is connected to the connection location P2 of the first conductor portion 1 via the connection conductor 42. The other end is grounded. The connection conductors 41 and 42 are, for example, movable probe pins or conductive screws.
　第１導体部１の接続箇所Ｐ１－Ｐ２間とコイル導体２０Ｃとで磁界型アンテナとしてのアンテナコイルが構成される。給電コイル３０は、第１導体部１の接続箇所Ｐ１－Ｐ２間とコイル導体２０Ｃに対して磁界結合する位置に配置されている。給電コイル３０にはＲＦＩＣ等による給電回路９が接続される。 An antenna coil as a magnetic field antenna is configured by the connection portion P1-P2 of the first conductor portion 1 and the coil conductor 20C. The feeding coil 30 is disposed between the connection points P1 and P2 of the first conductor portion 1 and at a position where it is magnetically coupled to the coil conductor 20C. A power feeding circuit 9 such as an RFIC is connected to the power feeding coil 30.
　回路基板１００には、給電部回路６、第１周波数帯用の給電回路５がさらに設けられている。第１導体部１の接続箇所Ｐ１には、給電部回路６を介して給電回路５が接続されている。 The circuit board 100 is further provided with a power feeding circuit 6 and a power feeding circuit 5 for the first frequency band. A power feeding circuit 5 is connected to the connection point P <b> 1 of the first conductor portion 1 via a power feeding unit circuit 6.
　図９（Ａ）は第２周波数帯でのアンテナ装置１０５の作用を示す等価回路図である。この例では、第２周波数帯（ＨＦ帯）において、給電部回路６は高インピーダンスとなるので、図９（Ａ）においては、給電部回路６および給電回路５は示していない。 FIG. 9A is an equivalent circuit diagram showing the operation of the antenna device 105 in the second frequency band. In this example, since the power feeding unit circuit 6 has a high impedance in the second frequency band (HF band), the power feeding unit circuit 6 and the power feeding circuit 5 are not shown in FIG. 9A.
　第１導体部１の接続箇所Ｐ１，Ｐ２間、接続導体４１，４２、第１周波数帯遮断素子７Ａ，７Ｂおよびコイル導体２０Ｃによって、アンテナコイル（第２周波数帯用の磁界型アンテナのループ部）が構成される。このループ部のインダクタンスと共振用キャパシタ８とによってＬＣ直列共振回路が構成される。 An antenna coil (a loop portion of a magnetic field type antenna for the second frequency band) between the connection points P1 and P2 of the first conductor part 1, the connection conductors 41 and 42, the first frequency band cutoff elements 7A and 7B, and the coil conductor 20C. Is configured. An LC series resonance circuit is constituted by the inductance of the loop portion and the resonance capacitor 8.
　図９（Ａ）においては、給電コイル３０と結合するアンテナコイル２０を１つのコイルで表している。このアンテナコイル２０と給電コイル３０との結合により、上記アンテナコイルに第２周波数帯の信号が給電される。 In FIG. 9A, the antenna coil 20 coupled to the feeding coil 30 is represented by one coil. Due to the coupling of the antenna coil 20 and the feeding coil 30, a signal in the second frequency band is fed to the antenna coil.
　本実施形態によれば、筐体の導体部がアンテナコイルの一部に兼用されるので、コイル開口の大きなアンテナコイルを構成しやすく、また、アンテナコイルは通信相手側アンテナとより近接するので、通信相手側アンテナとの結合係数が高まる。 According to this embodiment, since the conductor portion of the housing is also used as a part of the antenna coil, it is easy to configure an antenna coil with a large coil opening, and the antenna coil is closer to the communication partner antenna. The coupling coefficient with the communication partner antenna increases.
　図９（Ｂ）は、第１周波数帯でのアンテナ装置１０５の作用を示す等価回路図である。この例では、図７に示した給電部回路６は第２周波数帯遮断用のキャパシタである。第１周波数帯は例えばＵＨＦ帯またはＳＨＦ帯である。第１周波数帯において、給電部回路６は低インピーダンスとなるので、図９（Ｂ）においては、直接接続された回路として表している。また、この例では、第１周波数帯遮断素子７Ａ，７Ｂはインダクタであり、第１周波数帯において高インピーダンスとなるので、図９（Ｂ）においては回路としては示していない。なお、第１周波数帯遮断素子７Ａ，７Ｂ部分は、第１周波数帯で共振するＬＣ並列共振回路であってもよい。 FIG. 9B is an equivalent circuit diagram illustrating the operation of the antenna device 105 in the first frequency band. In this example, the power feeding unit circuit 6 shown in FIG. 7 is a capacitor for blocking the second frequency band. The first frequency band is, for example, the UHF band or the SHF band. In the first frequency band, the power feeding circuit 6 has a low impedance, and therefore, in FIG. 9B, it is represented as a directly connected circuit. In this example, the first frequency band cut-off elements 7A and 7B are inductors and have high impedance in the first frequency band, and are not shown as circuits in FIG. 9B. The first frequency band cutoff elements 7A and 7B may be LC parallel resonance circuits that resonate in the first frequency band.
　給電回路５は、例えばＵＨＦ帯またはＳＨＦ帯のＲＦＩＣである。この給電回路５は第１導体部１の接続箇所Ｐ１に第１周波数帯の信号を給電する。第１導体部１は逆Ｌ型アンテナ等の定在波型アンテナとして作用する。 The power supply circuit 5 is, for example, a UHF band or SHF band RFIC. The power feeding circuit 5 feeds a signal in the first frequency band to the connection point P <b> 1 of the first conductor portion 1. The first conductor portion 1 acts as a standing wave antenna such as an inverted L antenna.
　なお、以上に示した幾つかの実施形態では、本発明に係る面状導体を、回路基板に形成されたグランド導体や筐体の導体部で構成した例を示したが、その他にディスプレイパネルのシールド板やバッテリーパック等を面状導体として兼用してもよい。 In some of the embodiments described above, the planar conductor according to the present invention is configured by the ground conductor formed on the circuit board or the conductor portion of the casing. A shield plate, a battery pack or the like may also be used as the planar conductor.
　また、以上に示した各実施形態では、回路基板１００、面状導体１０の平面形状やアンテナコイル２０の外形がそれぞれ矩形である例を示したが、この形状に限定されるものではない。これらは一部または全部が曲線状でもよい。 In each of the embodiments described above, the planar shape of the circuit board 100 and the planar conductor 10 and the outer shape of the antenna coil 20 are rectangular. However, the present invention is not limited to this shape. Some or all of these may be curved.
　また、以上に示した各実施形態では、給電コイル３０とアンテナコイル２０とが主に磁界を介して結合するように説明したが、両者の導体パターンの近接により、電界を介する結合も生じ、この電界結合も利用してもよい。 Further, in each of the embodiments described above, the feeding coil 30 and the antenna coil 20 have been described as being coupled mainly via a magnetic field. However, due to the proximity of the two conductor patterns, coupling via an electric field also occurs. Electric field coupling may also be used.
　なお、上述の実施形態では、アンテナコイルが、近傍界通信のための磁界放射に寄与する磁界放射型アンテナとして作用する例を示したが、本発明はこの構成に限定されるものではない。アンテナコイルが電磁誘導方式非接触電力伝送システムや磁界共鳴方式非接触電力伝送システム等の少なくとも磁界結合を利用した非接触電力伝送システムの受電アンテナや送電アンテナとしても使用できる。送電装置において上述の実施形態のアンテナ装置を用いる場合、アンテナコイルは送電アンテナとなり、第２給電回路は送電アンテナに電力を供給する送電回路となる。受電装置において上述の実施形態のアンテナ装置を用いる場合、アンテナコイルは受電アンテナとなり、第２給電回路は受電装置内の負荷に受電アンテナからの電力を供給する受電回路となる。 In the above-described embodiment, an example is shown in which the antenna coil acts as a magnetic field radiation antenna that contributes to magnetic field radiation for near-field communication, but the present invention is not limited to this configuration. The antenna coil can also be used as a power receiving antenna or a power transmitting antenna of a non-contact power transmission system using at least magnetic coupling such as an electromagnetic induction type non-contact power transmission system or a magnetic resonance type non-contact power transmission system. When the antenna device of the above-described embodiment is used in the power transmission device, the antenna coil is a power transmission antenna, and the second power feeding circuit is a power transmission circuit that supplies power to the power transmission antenna. When the antenna device according to the above-described embodiment is used in the power receiving device, the antenna coil is a power receiving antenna, and the second power feeding circuit is a power receiving circuit that supplies power from the power receiving antenna to a load in the power receiving device.
　最後に、上述の実施形態の説明は、すべての点で例示であって、制限的なものではない。当業者にとって変形および変更が適宜可能である。例えば、異なる実施形態で示した構成の部分的な置換または組み合わせが可能である。本発明の範囲は、上述の実施形態ではなく、特許請求の範囲によって示される。さらに、本発明の範囲には、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Modifications and changes can be made as appropriate by those skilled in the art. For example, partial replacements or combinations of the configurations shown in the different embodiments are possible. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.
ＤＳ…不連続部
ＧＡ…グランド領域
ＮＧＡ…非グランド領域
Ｐ１，Ｐ２…接続箇所
１…第１導体部
２…第２導体部
５…給電回路
６…給電部回路
７Ａ，７Ｂ…第１周波数帯遮断素子
８…共振用キャパシタ
９…給電回路
１０，１０Ａ，１０Ｂ，１０Ｍ，１０Ｎ…面状導体
１０Ｓ…第１辺
２０…アンテナコイル
２０Ａ…コイル開口
２０ＡＸ…アンテナコイルのコイル軸
２０Ｃ…コイル導体
２１…アンテナコイルの第１部
２２…アンテナコイルの第２部
３０…給電コイル
３０ＡＸ…給電コイルのコイル軸
４１，４２…接続導体
５０…回路基板
１００…回路基板
１０１…アンテナ装置
１０１Ｐ…比較例のアンテナ装置
１０２Ａ，１０２Ｂ，１０２Ｃ…アンテナ装置
１０３～１０５…アンテナ装置
２０５…電子機器 DS: discontinuous portion GA: ground region NGA ... non-ground region P1, P2 ... connection location 1 ... first conductor portion 2 ... second conductor portion 5 ... feeder circuit 6 ... feeder circuit 7A, 7B ... first frequency band cutoff Element 8 ... Resonant capacitor 9 ... Feed circuit 10, 10A, 10B, 10M, 10N ... Planar conductor 10S ... First side 20 ... Antenna coil 20A ... Coil opening 20AX ... Coil axis 20C of antenna coil ... Coil conductor 21 ... Antenna Coil first part 22 ... Antenna coil second part 30 ... Feed coil 30AX ... Feed coil axis 41, 42 ... Connection conductor 50 ... Circuit board 100 ... Circuit board 101 ... Antenna device 101P ... Antenna device 102A of the comparative example , 102B, 102C ... antenna devices 103 to 105 ... antenna device 205 ... electronic equipment

Claims (9)

  1. 　面に沿ったコイル導体で構成されるアンテナコイルと、
    　前記アンテナコイルと磁界結合する位置に配置される給電コイルと、を備えるアンテナ装置において、
    　前記給電コイルに対して前記アンテナコイル側に配置され、平面視で、前記アンテナコイルの第１部の近傍に形成され、前記アンテナコイルの第１部から前記アンテナコイルの外側に拡がっており、前記アンテナコイルのコイル開口と重ならない領域を有する面状導体を備え、
    　前記給電コイルは、前記アンテナコイルの第１部以外の第２部に少なくとも磁界結合する位置に配置される、アンテナ装置。     An antenna coil composed of a coil conductor along the surface;
    In an antenna device comprising: a feeding coil disposed at a position where the antenna coil is magnetically coupled;
    The antenna coil is disposed on the antenna coil side with respect to the feeding coil, and is formed in the vicinity of the first part of the antenna coil in a plan view, and extends from the first part of the antenna coil to the outside of the antenna coil. A planar conductor having a region that does not overlap with the coil opening of the antenna coil,
    The antenna device, wherein the feeding coil is disposed at a position at least magnetically coupled to a second part other than the first part of the antenna coil.
  2. 　前記アンテナコイルの第１部の少なくとも一部は、前記アンテナコイルのコイル軸を挟んで前記給電コイルと対向する、請求項１に記載のアンテナ装置。 The antenna device according to claim 1, wherein at least a part of the first part of the antenna coil is opposed to the feeding coil with a coil axis of the antenna coil interposed therebetween.
  3. 　前記面状導体は第１辺を有し、
    　前記アンテナコイルの第１部は前記面状導体の第１辺に沿って延伸し、
    　前記給電コイルのコイル軸方向は、前記面状導体の第１辺に垂直方向である、請求項１または２に記載のアンテナ装置。     The planar conductor has a first side;
    The first portion of the antenna coil extends along the first side of the planar conductor,
    The antenna device according to claim 1, wherein a coil axis direction of the power feeding coil is a direction perpendicular to a first side of the planar conductor.
  4. 　前記アンテナコイルのコイル軸方向に平面視したとき、前記給電コイルは前記アンテナコイルのコイル開口内または前記アンテナコイルの第２部に重なる、請求項１から３のいずれかに記載のアンテナ装置。 The antenna device according to any one of claims 1 to 3, wherein the feeding coil overlaps with a coil opening of the antenna coil or a second part of the antenna coil when viewed in plan in the coil axis direction of the antenna coil.
  5. 　前記コイル導体は回路基板に形成された導体パターンである、請求項１から４の何れかに記載のアンテナ装置。 The antenna device according to any one of claims 1 to 4, wherein the coil conductor is a conductor pattern formed on a circuit board.
  6. 　前記面状導体は回路基板に形成されたグランド導体である、請求項１から５のいずれかに記載のアンテナ装置。 The antenna device according to any one of claims 1 to 5, wherein the planar conductor is a ground conductor formed on a circuit board.
  7. 　アンテナ装置と筐体を備える電子機器であって、
    　前記アンテナ装置は、
    　面に沿ったコイル導体で構成されるアンテナコイルと、前記アンテナコイルと磁界結合する位置に配置される給電コイルと、を備え、
    　前記給電コイルに対して前記アンテナコイル側に配置され、平面視で、前記アンテナコイルの第１部の近傍に形成され、前記アンテナコイルの第１部から前記アンテナコイルの外側に拡がっており、前記アンテナコイルのコイル開口と重ならない領域を有する面状導体を備え、
    　前記給電コイルは、前記アンテナコイルの第１部以外の第２部に少なくとも磁界結合する位置に配置される、ことを特徴とする電子機器。     An electronic device comprising an antenna device and a housing,
    The antenna device is
    An antenna coil composed of a coil conductor along the surface, and a feeding coil arranged at a position where the antenna coil is magnetically coupled,
    The antenna coil is disposed on the antenna coil side with respect to the feeding coil, and is formed in the vicinity of the first part of the antenna coil in a plan view, and extends from the first part of the antenna coil to the outside of the antenna coil. A planar conductor having a region that does not overlap with the coil opening of the antenna coil,
    The electronic device, wherein the power supply coil is disposed at a position at least magnetically coupled to a second part other than the first part of the antenna coil.
  8. 　前記筐体は導体部を有し、
    　前記アンテナコイルは、前記筐体の導体部に接続される、請求項７に記載の電子機器。     The housing has a conductor portion;
    The electronic device according to claim 7, wherein the antenna coil is connected to a conductor portion of the housing.
  9. 　前記筐体は導体部を有し、
    　前記面状導体は前記筐体の導体部である、請求項７に記載の電子機器。     The housing has a conductor portion;
    The electronic device according to claim 7, wherein the planar conductor is a conductor portion of the housing.
PCT/JP2016/064545 2015-05-21 2016-05-17 Antenna device and electronic apparatus WO2016186092A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020026203A1 (en) * 2018-08-02 2020-02-06 Logomotion, S.R.O. Antenna system with at least two antennas, mainly for nfc transmission
JPWO2021117694A1 (en) * 2019-12-11 2021-06-17

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014027389A (en) * 2012-07-25 2014-02-06 Nec Tokin Corp Antenna device
WO2015068473A1 (en) * 2013-11-08 2015-05-14 株式会社村田製作所 Antenna device, communication terminal device, and cover for communication terminal device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014027389A (en) * 2012-07-25 2014-02-06 Nec Tokin Corp Antenna device
WO2015068473A1 (en) * 2013-11-08 2015-05-14 株式会社村田製作所 Antenna device, communication terminal device, and cover for communication terminal device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020026203A1 (en) * 2018-08-02 2020-02-06 Logomotion, S.R.O. Antenna system with at least two antennas, mainly for nfc transmission
JPWO2021117694A1 (en) * 2019-12-11 2021-06-17
WO2021117694A1 (en) * 2019-12-11 2021-06-17 株式会社村田製作所 Electronic device
JP7264277B2 (en) 2019-12-11 2023-04-25 株式会社村田製作所 Electronics

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