JPWO2017047483A1 - ANTENNA DEVICE AND ELECTRONIC DEVICE - Google Patents

Abstract

The antenna device (101) of the present invention includes a planar conductor (10), a coil antenna (20), and a magnetic body (30). The coil antenna (20) is wound around a coil opening (20AP) and has a coil conductor (21) constituting one or a plurality of layers, and the coil conductor (21) is formed on the outer edge of the planar conductor (10). Nearly, at least a part of the coil opening (20AP) overlaps a region outside the outer edge of the planar conductor (10) in a plan view of the coil opening (20AP), and the magnetic body (30) is composed of the planar conductor (10). The magnetic body (30) is arranged along the planar conductor (10) from the coil antenna (20) toward the outer edge of the planar conductor (10). It has an extending portion (31A, 31B, 31C) extending.

Description

  The present invention relates to an antenna device used in, for example, a short-range communication system and a non-contact power transmission system, and an electronic device including the antenna device.

  For example, Patent Document 1 discloses an antenna device used in a near field communication system such as NFC (Near Field Communication) or a non-contact power transmission system.

  Patent Document 1 describes that a metal plate acts as a radiating element by magnetically coupling a power transmission coil and a short-distance communication coil to a metal plate. Moreover, the structure which has arrange | positioned the magnetic body sheet | seat on the opposite side to the said metal plate to which each coil magnetically couple | bonded is also described.

International Publication No. 2014/167881

  In general, with the miniaturization of electronic devices, the size of the coil antenna is naturally reduced if a sufficient space cannot be secured inside the housing. In addition, with the increase in required power of electronic devices, there is a tendency for an increase in the amount of power transmitted by non-contact power transmission.

  An antenna device used for a short-range communication system or a non-contact power transmission system includes a coil antenna. And in order to raise electric power transmission amount, it is important to raise the coupling | bonding degree of the magnetic field coupling of the coil antenna of an electronic device and the coil antenna of the other party apparatus (for example, charging stand) as much as possible.

  When the above-described antenna device is provided with a coil antenna and a planar conductor facing each other, and a magnetic body acting as a magnetic path of magnetic flux interlinking the coil antenna is further provided, the coil antenna and the planar conductor are strongly magnetically coupled. . However, simply disposing a magnetic material does not sufficiently enhance the magnetic field coupling between the coil and the conductive member, and the planar conductor may not function sufficiently as a magnetic flux radiating element. In addition, simply providing a large-sized magnetic body cannot provide a high enough bond for the cost.

  Incidentally, the magnetic sheet shown in Patent Document 1 is provided to suppress unnecessary magnetic field coupling between the coil antenna and the printed wiring board.

  An object of the present invention is to provide an antenna device that effectively increases the degree of coupling of magnetic field coupling with a coil antenna of a counterpart device, and an electronic apparatus including the antenna device.

(1) An antenna device of the present invention includes a planar conductor, a coil antenna, and a magnetic body,
The coil antenna has a coil conductor wound around a coil opening and constituting one or more layers;
The coil conductor is close to the outer edge of the planar conductor, and at least a part of the coil opening overlaps with a region outside the outer edge of the planar conductor in a plan view of the coil opening,
The magnetic body is disposed at a position not interposed between the planar conductor and the coil antenna,
The magnetic body has an extending portion that extends from the coil antenna toward the outer edge of the planar conductor along the planar conductor.

  With the configuration described above, the planar conductor faces the coil antenna of the counterpart device, so that the magnetic body is disposed on the opposite side of the counterpart device, and the side on which the magnetic body is not disposed (the counterpart side) Magnetic flux spreads in the device direction), the coil antenna of the counterpart device and the planar conductor are strongly magnetically coupled, and the coil antenna of the antenna device is strongly magnetically coupled to the coil antenna of the counterpart device.

(2) It is preferable that at least a part of the coil conductor overlaps the planar conductor. As a result, the coil antenna and the planar conductor of the antenna device are strongly magnetically coupled, and the degree of magnetic field coupling between the coil antenna of the antenna device and the coil antenna of the counterpart device is further increased.

(3) In the above (1) or (2), the planar conductor has a notch at an outer edge, and at least a part of the coil opening overlaps the notch of the planar conductor in plan view. preferable. As a result, the coil antenna of the antenna device and the planar conductor are strongly coupled, and the degree of magnetic field coupling between the coil antenna of the antenna device and the coil antenna of the counterpart device is further increased.

(4) In any one of (1) to (3), the coil antenna is preferably disposed between the planar conductor and the magnetic body. As a result, leakage magnetic flux from the coil antenna of the antenna device is hardly generated, and the coil antenna of the antenna device and the planar conductor are strongly magnetically coupled.

(5) In any one of the above (1) to (4), it is preferable that the extending portion is linear. As a result, the length of the magnetic body in the longitudinal direction becomes the shortest, and the coil antenna of the antenna device and the planar conductor are strongly magnetically coupled.

(6) In any one of (1) to (5), the number of the extending portions is preferably plural. As a result, the coil antenna of the antenna device and the planar conductor are strongly magnetically coupled.

(7) The electronic device of the present invention includes a planar conductor, a coil antenna, a magnetic body, and a housing.
The coil antenna is adjacent to an outer edge of the planar conductor;
The coil antenna has a coil conductor that is wound around a coil opening and forms one or more layers, and at least a part of the coil opening is more than an outer edge of the planar conductor in a plan view of the coil opening. Overlap the outer area,
The magnetic body is disposed at a position not interposed between the planar conductor and the coil antenna,
The magnetic body has an extending portion that extends from the coil antenna toward the outer edge of the planar conductor along the planar conductor,
At least the magnetic body is housed in the housing.

  With the configuration described above, the coil antenna of the electronic device is strongly magnetically coupled to the coil antenna of the counterpart device.

(8) An electronic device of the present invention includes a coil antenna, a magnetic body, and a housing,
The housing is at least partially a planar conductor,
The coil antenna is adjacent to an outer edge of the planar conductor;
The coil antenna has a coil conductor that is wound around a coil opening and forms one or more layers, and at least a part of the coil opening is more than an outer edge of the planar conductor in a plan view of the coil opening. Overlap the outer area,
The magnetic body is disposed at a position not interposed between the planar conductor and the coil antenna,
The magnetic body has an extending portion that extends from the coil antenna toward the outer edge of the planar conductor along the planar conductor,
At least the magnetic body is housed in the housing.

  With the configuration described above, the coil antenna of the electronic device is strongly magnetically coupled to the coil antenna of the counterpart device.

(9) The electronic device according to (7) or (8) is connected to the coil antenna, for example, and is connected to the coil antenna and the coil antenna, and is used for the power transmission system. A power transmission circuit. As a result, not only short-distance communication but also non-contact power transmission of large power becomes possible while being a small antenna device.

  ADVANTAGE OF THE INVENTION According to this invention, the antenna apparatus which effectively raised the coupling | bonding degree of the magnetic field coupling with the coil antenna of the other party apparatus, and an electronic device provided with the same are comprised.

FIG. 1 is a cross-sectional view of an electronic apparatus 201 according to the first embodiment. FIG. 2 is a plan view showing a housing of the electronic device 201. FIG. 3 is a plan view showing the configuration of the main part inside the housing of the electronic apparatus 201. 4 (A) and 4 (B) are perspective views showing a coil antenna having coil conductors constituting a plurality of layers. FIGS. 5A, 5 </ b> B, 5 </ b> C, and 5 </ b> D are plan views illustrating the configuration of the main part of the electronic apparatus according to the second embodiment. FIGS. 6A, 6 </ b> B, 6 </ b> C, and 6 </ b> D are diagrams illustrating the structure and arrangement of the magnetic body 30 included in the electronic apparatus according to the third embodiment. FIGS. 7A, 7 </ b> B, and 7 </ b> C are diagrams illustrating the structure and arrangement of the magnetic body included in the electronic apparatus according to the fourth embodiment. FIGS. 8A, 8 </ b> B, 8 </ b> C, and 8 </ b> D are diagrams illustrating the structure and arrangement of a magnetic body included in the electronic apparatus according to the fifth embodiment. FIG. 9 is a cross-sectional view of an electronic device 206 according to the sixth embodiment. FIG. 10 is a circuit diagram of a main part of an electronic apparatus according to the seventh embodiment.

  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.

<< First Embodiment >>
In the first embodiment, an antenna device applied to a short-range communication system and a non-contact power transmission system and an electronic device including the antenna device will be described.

  FIG. 1 is a cross-sectional view of an electronic apparatus 201 according to the first embodiment. FIG. 2 is a plan view showing a housing of the electronic device 201. FIG. 3 is a plan view showing the configuration of the main part inside the housing of the electronic apparatus 201.

  The electronic device 201 is a portable electronic device such as a so-called smartphone, and a display 50 is provided on the first surface of the housing. FIG. 2 is a plan view of the second surface of the housing. As shown in FIG. 2, the casing of the electronic device 201 includes a planar conductor 10 that is a metal casing and resin casings 91 and 92. The planar conductor 10 has a notch 10C. The lens portion of the camera module is disposed in the notch 10C. However, in FIGS. 1, 2, and 3, the lens portion and the like are not shown, and the notch 10 </ b> C is drawn open in order to clarify the structure according to the present invention. This applies not only to the present embodiment but also to the drawings shown in the following embodiments.

  As shown in FIG. 1, a coil antenna 20, a magnetic body 30, a circuit board 40, and the like are provided inside the housing. As described below, the planar conductor 10, the coil antenna 20, and the magnetic body 30 constitute an antenna device according to the present invention.

  The magnetic body 30 is, for example, a ferrite sheet obtained by forming a composite material of a resin material and magnetic ferrite powder into a sheet shape.

  The magnetic body 30 is disposed at a position not interposed between the planar conductor 10 and the coil antenna 20. In the example shown in FIG. 1, the coil antenna 20 is disposed in a layer between the planar conductor 10 and the magnetic body 30.

  The magnetic body 30 may be attached to the planar conductor 10 via an adhesive sheet (double-sided adhesive tape). The magnetic body 30 may be attached to the circuit board 40 via an adhesive sheet. The coil antenna 20 may be attached to the planar conductor 10 in an electrically insulated state, or may be attached to the magnetic body 30 in an electrically insulated state. The coil conductor of the coil antenna 20 is electrically connected to a circuit formed on the circuit board 40.

  As shown in FIG. 3, the coil conductor 21 is close to the outer edge of the planar conductor 10. In the present application, the inner edge of the notch 10 </ b> C is a part of the outer edge of the planar conductor 10.

  In the coil antenna 20 described above, the coil conductor 21 is formed in one layer, and the shape thereof is a rectangular spiral shape or a spiral shape. In addition, for example, as shown in FIG. The rectangular coil antenna 20 may be constituted by the coil conductors 21 constituting the layers. Further, for example, as shown in FIG. 4B, a helical coil antenna 20 may be constituted by coil conductors 21 constituting a plurality of layers.

  The coil antenna 20 is wound around the coil opening 20AP and has a coil conductor 21 constituting one or a plurality of layers. The coil opening 20AP at least partially overlaps the notch portion 10C of the planar conductor 10. That is, at least a part of the coil opening 20AP is exposed from the planar conductor 10 in plan view. In addition, at least a part of the coil conductor 21 overlaps the planar conductor 10 in plan view.

  Further, in plan view, the magnetic body 30 includes a collective portion 32 that overlaps the cutout portion 10C of the planar conductor 10 and the coil opening 20AP, and an outer edge direction of the planar conductor 10 along the planar conductor 10 from the collective portion 32. And extending portions 31A, 31B, and 31C extending radially (thus linearly).

  According to this embodiment, the magnetic flux generated from the coil antenna 20 passes through the magnetic body 30 having a high magnetic permeability. That is, the magnetic body 30 acts as a magnetic path with a high permeability, and the effect of magnetic flux radiation and magnetic collection of the coil antenna 20 is enhanced. The magnetic body 30 can extend the magnetic path of high permeability to the outside of the circuit board 40, thereby preventing the collected magnetic flux from interlinking with the circuit board 40, and unnecessary magnetic field coupling with the circuit board 40. Can be suppressed. For this reason, it is preferable that the magnetic body 30 extends to the circuit board 40 or the outer edge portion of the planar conductor 10.

  Further, since the magnetic flux passing through the magnetic body 30 is generated radially from the coil antenna 20, it is preferable to provide the extending portions 31 </ b> A, 31 </ b> B, and 31 </ b> C radially with respect to the coil antenna 20.

  The shapes of the extending portions 31A, 31B, and 31C are preferably linear because the magnetic flux generated from the coil antenna 20 is linear (radial), but may be configured with curves.

  Here, when the coil opening 20AP in contact with the extending portion is rectangular, the width of the extending portions 31A, 31B, and 31C is preferably equal to the length of each side of the rectangular shape. When the plurality of extending portions 31A, 31B, 31C are in contact with the rectangular sides of the coil opening 20AP, the length obtained by adding the widths of the extending portions is equal to the length obtained by adding the rectangular sides. It is preferable to become.

  Moreover, when the coil opening 20AP is circular, the length obtained by adding the widths of the extending portions 31A, 31B, and 31C is preferably equal to the length of the circular outer periphery of the coil opening 20AP.

  By arranging the magnetic body 30 in this manner, the magnetic flux is efficiently radiated to the planar conductor 10 side, and the degree of magnetic field coupling between the coil antenna 20 and the planar conductor 10 can be further increased.

  The planar conductor 10, the coil antenna 20, and the magnetic body 30 constitute an antenna device 101.

  FIG. 1 also shows a coil antenna 210 of a counterpart device such as a charging stand. In FIG. 1, the broken line indicates the state of the magnetic flux φ that contributes to magnetic field coupling between the coil antenna 20 and the coil antenna 210 of the counterpart device. As shown in FIG. 1, when the planar conductor 10 faces the coil antenna 210 of the counterpart device, the magnetic body 30 is disposed on the opposite side of the counterpart device, and thus the magnetic body 30. As a result of the magnetic flux spreading to the side where the conductor is not disposed (toward the counterpart device), the coil antenna 20 and the planar conductor 10 are strongly magnetically coupled, and the planar conductor 10 and the coil antenna 210 of the counterpart device are strongly coupled. Magnetic field coupling.

  In the example shown in FIG. 1, the metal casing portion which is a part of the casing is used as the planar conductor, but the planar conductor may be formed on a part of the resin casing.

  The magnetic body 30 may be a sintered ferrite plate other than the ferrite sheet. Furthermore, it may be a composite sheet in which an individualized sintered ferrite plate is attached to a flexible sheet.

<< Second Embodiment >>
FIGS. 5A, 5 </ b> B, 5 </ b> C, and 4 </ b> D are plan views showing the configuration of the main parts of the four electronic devices according to the second embodiment.

  In FIG. 2 of the first embodiment, the planar conductor 10 has an example in which the inside has a cutout portion 10C having a circular shape. However, as illustrated in FIG. The shape without a notch may be sufficient. Further, as shown in FIG. 5B, the cutout portion 10C may have a shape extending from the outer edge to the inside with a constant width. Furthermore, the housing may include a plurality of metal housing portions. In the example of FIG. 5C, in addition to the planar conductor 10A corresponding to the main part on the plane side and the main part on the side surface side of the metal casing part, the main part other than the main part on the plane side and the side surface side of the metal casing part. A planar conductor 10B constituting a portion other than the main part is provided, and a notch 10C is provided between the planar conductors 10A and 10B. This planar conductor 10A can be used in the same manner as the planar conductor 10 shown in FIG. Alternatively, the planar conductors 10A and 10B can be used similarly to the planar conductor 10 and the notch 10C shown in FIG.

  5A, 5B, and 5C, the coil antenna 20 includes a flexible substrate 22 and a rectangular spiral coil conductor 21 formed thereon. In the example of FIG. 5D, the coil antenna 20 is configured by winding the conductor wire 21 covered with the insulator in a circular shape, similarly to the example shown in FIG. 3 in the first embodiment. .

  5A and 5C, a part of the coil opening 20AP overlaps a region outside the outer edge of the planar conductor 10 of the coil opening 20AP in plan view. In addition, at least a part of the coil conductor 21 overlaps the planar conductor 10 in plan view.

  In the example of FIG. 5B, the coil antenna 20 is composed of a flexible substrate 22 and a rectangular spiral coil conductor 21 formed thereon. And in planar view, a part of coil opening 20AP overlaps the area | region outside the outer edge (inner edge of the notch part 10C) of the planar conductor 10 of coil opening 20AP. In addition, at least a part of the coil conductor 21 overlaps the planar conductor 10 in plan view.

  For example, spring pin terminals (not shown) projecting from the circuit board 40 abut on both ends of the coil conductor 21 of the coil antenna 20. Thereby, the coil conductor 21 is electrically connected to the circuit formed in the circuit board 40 through the spring pin terminal.

  In the example shown in this embodiment, the coil conductor 21 of the coil antenna 20 is a conductor pattern formed on a base material.

  5A, 5 </ b> B, and 5 </ b> C, the magnetic body 30 extends linearly in the longitudinal direction from the coil antenna 20 along the planar conductor 10 toward the outer edge of the planar conductor 10. In these examples, the entire magnetic body 30 is an “extended portion”.

  In the example of FIG. 5C, the magnetic body 30 extends halfway without reaching the outer edge of the planar conductor 10.

  5D, the arrangement relationship between the coil antenna 20 and its planar conductor 10 is as shown in FIG. In the example of FIG. 5D, the magnetic body 30 extends linearly in the longitudinal direction from the coil antenna 20 along the planar conductor 10 in the two outer edge directions of the planar conductor 10 facing each other. That is, the entire magnetic body 30 is an “extended portion”.

<< Third Embodiment >>
In the third embodiment, some shapes of different magnetic bodies different from the magnetic bodies shown in the first and second embodiments and examples of their arrangement are shown.

  6A, 6 </ b> B, 6 </ b> C, and 6 </ b> D are diagrams illustrating the structure and arrangement of the magnetic body 30 included in the electronic apparatus according to the third embodiment.

  6 (A), (B), (C), and (D), the arrangement relationship between the coil antenna 20 and its planar conductor 10 is as shown in FIGS. 5 (A), (B), (C), and (D). is there.

  In the example of FIG. 6A, the magnetic body 30 extends linearly in the short direction from the coil antenna 20 along the planar conductor 10 toward the outer edge of the planar conductor 10.

  In the example of FIG. 6B, the magnetic bodies 30 </ b> A and 30 </ b> B extend linearly in the short direction from the middle of the coil antenna 20 along the planar conductor 10 toward the outer edge of the planar conductor 10.

  The positions where the magnetic bodies 30A and 30B are provided are preferably such that the distance from the outer edge of the planar conductor 10 to the outer edge of the coil antenna 20 is short.

  6C and 6D, the magnetic body 30 extends linearly in the short direction from the coil antenna 20 to the two outer edge directions of the planar conductor 10 facing each other.

  In all of FIGS. 6A, 6B, 6C, and 6D, the entire magnetic body 30 is an “extended portion”.

<< Fourth Embodiment >>
In the fourth embodiment, some shapes of different magnetic bodies different from the magnetic bodies shown in the first, second, and third embodiments and examples of their arrangement are shown.

  FIGS. 7A, 7B, and 7C are views showing the structure and arrangement of a magnetic body included in an electronic apparatus according to the fourth embodiment.

  7A, 7B, and 7C, the arrangement relationship between the coil antenna 20 and the planar conductor 10 is shown in FIGS. 5A, 5B, and 6C, and FIGS. ).

  7A, 7 </ b> B, and 7 </ b> C, the magnetic bodies 31 </ b> A, 31 </ b> B, and 31 </ b> C are formed along the planar conductor 10 from the coil opening 20 </ b> AP of the coil antenna 20 toward the outer edge of the planar conductor 10. It extends radially in a letter shape.

<< Fifth Embodiment >>
In the fifth embodiment, some shapes of different magnetic bodies different from the magnetic bodies shown in the first to fourth embodiments and examples of their arrangement will be shown.

  FIGS. 8A, 8 </ b> B, 8 </ b> C, and 8 </ b> D are diagrams illustrating the structure and arrangement of a magnetic body included in the electronic device according to the fifth embodiment.

  8A, 8B, 8C, and 8D, the arrangement relationship between the coil antenna 20 and the planar conductor 10 is shown in FIGS. 5A, 5B, 5C, 6D, and 6A, respectively. ) (B) (C) (D) As shown.

  In the example of FIG. 8A, the magnetic bodies 31 </ b> D and 31 </ b> E extend obliquely from the coil antenna 20 along the planar conductor 10 in the angular direction of the planar conductor 10.

  8B and 8C, the magnetic bodies 31A, 31B, 31C, 31D, and 31E extend radially from the coil antenna 20 along the planar conductor 10.

  In the example of FIG. 8D, the magnetic bodies 31 </ b> A, 31 </ b> B, 31 </ b> C, 31 </ b> D, 31 </ b> E, 31 </ b> F, and 31 </ b> G extend radially from the coil antenna 20 along the planar conductor 10. In addition, openings are formed in the magnetic bodies 31A, 31B, 31C, 31D, 31E, 31F, and 31G at positions where the coil openings and the cutout portions of the planar conductors overlap. As a result, an electronic device such as a camera module can be arranged in such a manner as to penetrate the coil antenna, the planar conductor, and the magnetic body, so that it is suitable for arranging a thick electronic device. The conductor and the magnetic body can be brought closer to each other.

<< Sixth Embodiment >>
In the sixth embodiment, an electronic apparatus in which the positional relationship among the planar conductor, the coil antenna, and the magnetic body is different from that of the first embodiment will be described.

  FIG. 9 is a cross-sectional view of an electronic device 206 according to the sixth embodiment. Unlike the electronic device 201 shown in FIG. 1 in the first embodiment, a resin casing 90 is provided, and the planar conductor 10 does not constitute a part of the casing. Further, the coil conductor 21 of the coil antenna is disposed on the opposite side of the surface of the magnetic body 30 with respect to the planar conductor 10.

  The planar conductor 10 may be attached to the inner surface of the housing 90 via an adhesive sheet (double-sided adhesive tape). The magnetic body 30 may be attached to the planar conductor 10 via an adhesive sheet, or may be attached to the circuit board 40. The coil antenna 20 may be attached to the planar conductor 10 in an electrically insulated state, or may be attached to the inner surface of the housing 90. Other configurations are the same as those of the electronic apparatus 201 of the first embodiment.

  As in the present embodiment, a configuration in which the planar conductor 10 is disposed between the coil antenna 20 and the magnetic body 30 is also possible.

  In FIG. 9, the broken line indicates the state of the magnetic flux φ that contributes to the magnetic field coupling between the coil antenna 20 and the coil antenna 210 of the counterpart device. As shown in FIG. 9, the magnetic body 30 is arranged on the opposite side of the counterpart device from the coil antenna 210, so that a magnetic flux is generated on the side where the magnetic body 30 is not arranged (toward the counterpart device). The coil antenna 20 and the planar conductor 10 are strongly magnetically coupled, and the planar conductor 10 and the coil antenna 210 of the counterpart device are strongly magnetically coupled.

<< Seventh Embodiment >>
In the seventh embodiment, an example of an antenna device applied to a short-range communication system and a non-contact power transmission system and a circuit connected to the antenna device will be described.

  FIG. 10 is a circuit diagram of a main part of an electronic apparatus according to the seventh embodiment. The structure of the coil antenna is as shown in the above embodiments. In FIG. 10, an inductor L20 represents a coil antenna (coil antenna 20 shown in the above embodiments) by a circuit symbol of the inductor. The switching circuit 1 is a circuit that selectively connects the coil antenna to one of the power transmission circuit 2 and the NFC communication circuit 3. When the switching circuit 1 is connected to the power transmission circuit 2, the inductor L20 and the capacitor C1 constitute an LC resonance circuit that resonates at a frequency for non-contact power transmission. Further, when the switching circuit 1 is connected to the NFC communication circuit 3, an LC resonance circuit that resonates at a frequency for NFC communication is configured by the inductor L20 and the capacitor C2.

  The frequency for NFC communication is, for example, 13.56 MHz, and the frequency for non-contact power transmission is, for example, 6.78 MHz, which is ½ of the frequency. Both are frequency bands within the HF band of ISM (Industrial, Scientific and Medical Band), and the planar conductor 10 already shown acts as a radiating element, and the magnetic body 30 can effectively use its magnetic permeability.

  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.

C1, C2 ... Capacitor L20 ... Inductor 1 ... Switching circuit 2 ... Power transmission circuit 3 ... NFC communication circuits 10, 10A, 10B ... Planar conductor 10C ... Notch 11 ... Metal casing 20 ... Coil antenna 20AP ... Coil opening DESCRIPTION OF SYMBOLS 21 ... Coil conductor 22 ... Flexible base material 30,30A, 30B ... Magnetic body 31A-31G ... Magnetic body extending | stretching part 32 ... Magnetic body gathering part 40 ... Circuit board 50 ... Display 90 ... Resin casing 91,92 ... Resin casing Unit 101 ... Antenna devices 201, 202 ... Electronic equipment 210 ... Counter coil antenna

Claims (9)

In an antenna device comprising a planar conductor, a coil antenna and a magnetic body,
The coil antenna has a coil conductor wound around a coil opening and constituting one or more layers;
The coil conductor is close to the outer edge of the planar conductor, and at least a part of the coil opening overlaps with a region outside the outer edge of the planar conductor in a plan view of the coil opening,
The magnetic body is disposed at a position not interposed between the planar conductor and the coil antenna,
The said magnetic body is an antenna apparatus which has an extending | stretching part extended in the outer edge direction of the said planar conductor from the said coil antenna along the said planar conductor.   The antenna device according to claim 1, wherein at least a part of the coil conductor overlaps the planar conductor in the plan view.   The antenna device according to claim 1, wherein the planar conductor has a notch at an outer edge, and at least a part of the coil opening overlaps the notched portion of the planar conductor in the plan view.   The antenna device according to any one of claims 1 to 3, wherein the coil antenna is disposed between the planar conductor and the magnetic body.   The antenna device according to claim 1, wherein the extending portion is linear.   The antenna device according to claim 1, wherein the number of the extending portions is plural. In an electronic device comprising a planar conductor, a coil antenna, a magnetic body and a housing,
The coil antenna is adjacent to an outer edge of the planar conductor;
The coil antenna has a coil conductor that is wound around a coil opening and forms one or more layers, and at least a part of the coil opening is more than an outer edge of the planar conductor in a plan view of the coil opening. Overlap the outer area,
The magnetic body is disposed at a position not interposed between the planar conductor and the coil antenna,
The magnetic body has an extending portion that extends from the coil antenna toward the outer edge of the planar conductor along the planar conductor,
An electronic device in which at least the magnetic body is housed in the housing. In an electronic device comprising a coil antenna, a magnetic body and a housing,
The housing is at least partially a planar conductor,
The coil antenna is adjacent to an outer edge of the planar conductor;
The coil antenna has a coil conductor that is wound around a coil opening and forms one or more layers, and at least a part of the coil opening is more than an outer edge of the planar conductor in a plan view of the coil opening. Overlap the outer area,
The magnetic body is disposed at a position not interposed between the planar conductor and the coil antenna,
The magnetic body has an extending portion that extends from the coil antenna toward the outer edge of the planar conductor along the planar conductor,
An electronic device in which at least the magnetic body is housed in the housing.   The electronic device according to claim 7, comprising: a communication circuit connected to the coil antenna and used for a short-range communication system; and a power transmission circuit connected to the coil antenna and used for a power transmission system. .

Images