JP2020170988A

JP2020170988A - Antenna device and electronic device

Info

Publication number: JP2020170988A
Application number: JP2019072818A
Authority: JP
Inventors: 昌良山本; Masayoshi Yamamoto
Original assignee: Murata Manufacturing Co Ltd
Current assignee: Murata Manufacturing Co Ltd
Priority date: 2019-04-05
Filing date: 2019-04-05
Publication date: 2020-10-15

Abstract

To expand a communicable area with an antenna device on the other side.SOLUTION: An antenna device 1 includes a coil conductor 4, a magnetic material 5, and a first plane conductor 6. The coil conductor 4 includes a first coil conductor portion 41 and a second coil conductor portion 42. The magnetic material 5 has a first main surface 51 and a second main surface 52. The first coil conductor portion 41 is provided on the first main surface 51 side. The second coil conductor portion 42 is provided on the second main surface 52 side. The first coil conductor portion 41 and the second coil conductor portion 42 overlap with the magnetic material 5. The first coil conductor portion 41 does not overlap with the second coil conductor portion 42. The first plane conductor 6 does not conduct with the coil conductor 4 and does not overlap with the coil conductor. At least a part of the first plane conductor 6 overlaps with the magnetic material 5. The first coil conductor portion 41 is located between the first plane conductor 6 and the second coil conductor portion 42 in a plan view of the first main surface 51.SELECTED DRAWING: Figure 1

Description

本発明は、一般にアンテナ装置及び電子機器に関し、より詳細には、コイル導体及び磁性体を備えるアンテナ装置、及び、アンテナ装置を備える電子機器に関する。 The present invention generally relates to an antenna device and an electronic device, and more particularly to an antenna device including a coil conductor and a magnetic material, and an electronic device including the antenna device.

従来、コイル導体及び磁性体を備えるアンテナ装置が知られている（例えば、特許文献１参照）。 Conventionally, an antenna device including a coil conductor and a magnetic material is known (see, for example, Patent Document 1).

特許文献１に記載されたアンテナは、磁性体コア（磁性体）と、コイル導体とを備える。コイル導体は、磁性体コアの第１主面に近接する第１の導体部分（第１コイル導体部）と、磁性体コアの第２主面に近接する第２の導体部分（第２コイル導体部）とを有する。第１の導体部分と第２の導体部分とは、磁性体コアの第１主面の平面視で、互いに重なっていない位置にある。 The antenna described in Patent Document 1 includes a magnetic core (magnetic material) and a coil conductor. The coil conductor includes a first conductor portion (first coil conductor portion) close to the first main surface of the magnetic core and a second conductor portion (second coil conductor portion) close to the second main surface of the magnetic core. Part) and. The first conductor portion and the second conductor portion are located at positions where they do not overlap each other in the plan view of the first main surface of the magnetic core.

特開２０１０−２４５７７６号公報Japanese Unexamined Patent Publication No. 2010-2475776

特許文献１に記載された従来のアンテナ装置では、アンテナ装置と相手側アンテナ装置との位置関係によって、相手側アンテナ装置からの磁束の一部がコイル導体に囲まれているコイル開口及び磁性体の内部を通る一方、相手側アンテナ装置からの磁束の他の一部がコイル導体の外側及び磁性体の内部を通る。コイル開口及び磁性体の内部を通る磁束とコイル導体の外側及び磁性体の内部を通る磁束とは、磁性体の内部において向きが反対となるため、互いに弱め合うことになる。その結果、相手側アンテナ装置との通信可能エリアが狭くなるという問題があった。 In the conventional antenna device described in Patent Document 1, depending on the positional relationship between the antenna device and the other side antenna device, a part of the magnetic flux from the other side antenna device is surrounded by the coil conductor, and the coil opening and the magnetic material. While passing through the interior, the other portion of the magnetic flux from the mating antenna device passes outside the coil conductor and inside the magnetic material. The magnetic flux passing through the coil opening and the inside of the magnetic material and the magnetic flux passing through the outside of the coil conductor and the inside of the magnetic material have opposite directions inside the magnetic material, so that they weaken each other. As a result, there is a problem that the communicable area with the antenna device on the other side is narrowed.

本発明は上記の点に鑑みてなされた発明であり、本発明の目的は、相手側アンテナ装置との通信可能エリアを広げることができるアンテナ装置及び電子機器を提供することにある。 The present invention has been made in view of the above points, and an object of the present invention is to provide an antenna device and an electronic device capable of expanding a communicable area with a partner antenna device.

本発明の一態様に係るアンテナ装置は、コイル導体と、磁性体と、第１平面導体とを備える。前記コイル導体は、第１コイル導体部及び第２コイル導体部を有する。前記磁性体は、第１主面及び第２主面を有する。前記第１コイル導体部は、前記第１主面側に設けられている。前記第２コイル導体部は、前記第２主面側に設けられている。前記第１コイル導体部及び前記第２コイル導体部は、前記第１主面の平面視で、前記磁性体と重なっている。前記第１コイル導体部は、前記第１主面の平面視で、前記第２コイル導体部と重なっていない。前記第１平面導体は、前記コイル導体と導通せず、かつ、前記第１主面の平面視で、前記コイル導体と重なっていない。前記第１平面導体の少なくとも一部は、前記第１主面の平面視で、前記第１主面と対向するように前記磁性体と重なっている。前記第１コイル導体部は、前記第１主面の平面視で、前記第１平面導体と前記第２コイル導体部との間に位置する。 The antenna device according to one aspect of the present invention includes a coil conductor, a magnetic material, and a first plane conductor. The coil conductor has a first coil conductor portion and a second coil conductor portion. The magnetic material has a first main surface and a second main surface. The first coil conductor portion is provided on the first main surface side. The second coil conductor portion is provided on the second main surface side. The first coil conductor portion and the second coil conductor portion overlap with the magnetic material in a plan view of the first main surface. The first coil conductor portion does not overlap with the second coil conductor portion in a plan view of the first main surface. The first plane conductor does not conduct with the coil conductor and does not overlap with the coil conductor in the plan view of the first main surface. At least a part of the first plane conductor overlaps the magnetic material so as to face the first main surface in a plan view of the first main surface. The first coil conductor portion is located between the first plane conductor and the second coil conductor portion in a plan view of the first main surface.

本発明の一態様に係る電子機器は、アンテナ装置と、筐体とを備える。前記筐体は、前記アンテナ装置を収容する。前記アンテナ装置は、コイル導体と、磁性体と、平面導体とを備える。前記コイル導体は、第１コイル導体部及び第２コイル導体部を有する。前記磁性体は、第１主面及び第２主面を有する。前記第１コイル導体部は、前記第１主面側に設けられている。前記第２コイル導体部は、前記第２主面側に設けられている。前記第１コイル導体部及び前記第２コイル導体部は、前記第１主面の平面視で、前記磁性体と重なっている。前記第１コイル導体部は、前記第１主面の平面視で、前記第２コイル導体部と重なっていない。前記平面導体は、前記コイル導体と導通せず、かつ、前記第１主面の平面視で、前記コイル導体と重なっていない。前記平面導体の少なくとも一部は、前記第１主面の平面視で、前記第１主面と対向するように前記磁性体と重なっている。前記第１コイル導体部は、前記第１主面の平面視で、前記平面導体と前記第２コイル導体部との間に位置する。 The electronic device according to one aspect of the present invention includes an antenna device and a housing. The housing houses the antenna device. The antenna device includes a coil conductor, a magnetic material, and a flat conductor. The coil conductor has a first coil conductor portion and a second coil conductor portion. The magnetic material has a first main surface and a second main surface. The first coil conductor portion is provided on the first main surface side. The second coil conductor portion is provided on the second main surface side. The first coil conductor portion and the second coil conductor portion overlap with the magnetic material in a plan view of the first main surface. The first coil conductor portion does not overlap with the second coil conductor portion in a plan view of the first main surface. The plane conductor does not conduct with the coil conductor and does not overlap with the coil conductor in the plan view of the first main surface. At least a part of the plane conductor overlaps the magnetic material so as to face the first main surface in a plan view of the first main surface. The first coil conductor portion is located between the planar conductor and the second coil conductor portion in a plan view of the first main surface.

本発明の上記態様に係るアンテナ装置及び電子機器によれば、相手側アンテナ装置との通信可能エリアを広げることができる。 According to the antenna device and the electronic device according to the above aspect of the present invention, the communicable area with the antenna device on the other side can be expanded.

図１Ａは、実施形態１に係るアンテナ装置の平面図である。図１Ｂは、同上のアンテナ装置のＸ１−Ｘ１線断面図である。FIG. 1A is a plan view of the antenna device according to the first embodiment. FIG. 1B is a sectional view taken along line X1-X1 of the same antenna device. 図２Ａは、同上のアンテナ装置の斜視図である。図２Ｂは、同上のアンテナ装置の平面図である。FIG. 2A is a perspective view of the same antenna device. FIG. 2B is a plan view of the same antenna device. 図３は、同上のアンテナ装置の特性図である。FIG. 3 is a characteristic diagram of the antenna device of the same as above. 図４は、同上のアンテナ装置の動作を示す概略図である。FIG. 4 is a schematic view showing the operation of the antenna device of the above. 図５Ａは、実施形態１の変形例１に係るアンテナ装置の断面図である。図５Ｂは、実施形態１の変形例２に係るアンテナ装置の断面図である。図５Ｃは、実施形態１の変形例３に係るアンテナ装置の断面図である。FIG. 5A is a cross-sectional view of the antenna device according to the first modification of the first embodiment. FIG. 5B is a cross-sectional view of the antenna device according to the second modification of the first embodiment. FIG. 5C is a cross-sectional view of the antenna device according to the third modification of the first embodiment. 図６Ａは、実施形態１の変形例４に係るアンテナ装置の断面図である。図６Ｂは、実施形態１の変形例５に係るアンテナ装置の断面図である。FIG. 6A is a cross-sectional view of the antenna device according to the fourth modification of the first embodiment. FIG. 6B is a cross-sectional view of the antenna device according to the fifth modification of the first embodiment. 図７Ａは、実施形態２に係る電子機器の平面図である。図７Ｂは、同上の電子機器のＹ１−Ｙ１線断面図である。FIG. 7A is a plan view of the electronic device according to the second embodiment. FIG. 7B is a cross-sectional view taken along the line Y1-Y1 of the same electronic device.

以下、実施形態１に係るアンテナ装置及び実施形態２に係る電子機器について、図面を参照して説明する。下記の実施形態等において参照する各図は、模式的な図であり、図中の各構成要素の大きさや厚さそれぞれの比が、必ずしも実際の寸法比を反映しているとは限らない。 Hereinafter, the antenna device according to the first embodiment and the electronic device according to the second embodiment will be described with reference to the drawings. Each figure referred to in the following embodiments and the like is a schematic view, and the ratio of the size and the thickness of each component in the figure does not necessarily reflect the actual dimensional ratio.

各実施形態に係る「アンテナ装置」は、「無線伝送システム」に用いられるアンテナ装置である。ここで、「無線伝送システム」は、伝送相手（外部機器のアンテナ）と、磁界結合による無線伝送を行うシステムである。「伝送」は、信号の送受信と電力の送受信との両方の意味を含む。また、「無線伝送システム」は、近距離無線通信システムと無線給電システムとの両方の意味を含む。アンテナ装置は磁界結合による無線伝送を行うため、アンテナ装置の電流経路の長さつまり後述のコイル導体の線路長は、無線伝送で使用する周波数における波長λに比べて十分に小さく、λ／１０以下である。したがって、無線伝送の使用周波数帯においては電磁波の放射効率は低い。なお、ここでいう波長λは、コイル導体が設けられている基材の誘電性及び透磁性による波長短縮効果を考慮した実効的な波長である。コイル導体の両端は、給電回路に接続され、アンテナ装置の電流経路つまりコイル導体には、ほぼ一様な大きさの電流が流れる。 The "antenna device" according to each embodiment is an antenna device used in the "wireless transmission system". Here, the "wireless transmission system" is a system that performs wireless transmission by magnetic field coupling with a transmission partner (antenna of an external device). "Transmission" includes both the transmission and reception of signals and the transmission and reception of electric power. Further, "wireless transmission system" includes the meanings of both a short-range wireless communication system and a wireless power supply system. Since the antenna device performs wireless transmission by magnetic field coupling, the length of the current path of the antenna device, that is, the line length of the coil conductor described later, is sufficiently smaller than the wavelength λ at the frequency used for wireless transmission, and is λ / 10 or less. Is. Therefore, the radiation efficiency of electromagnetic waves is low in the frequency band used for wireless transmission. The wavelength λ referred to here is an effective wavelength in consideration of the wavelength shortening effect due to the dielectric property and magnetic permeability of the base material provided with the coil conductor. Both ends of the coil conductor are connected to a power feeding circuit, and a current of substantially uniform magnitude flows through the current path of the antenna device, that is, the coil conductor.

また、各実施形態に係る「アンテナ装置」に用いられる近距離無線通信としては、例えばＮＦＣ（Near Field Communication）がある。近距離無線通信で使用される周波数帯は、例えばＨＦ帯であり、特に１３．５６ＭＨｚ及びその近傍の周波数帯である。 Further, as a short-range wireless communication used in the "antenna device" according to each embodiment, there is, for example, NFC (Near Field Communication). The frequency band used in short-range wireless communication is, for example, the HF band, particularly 13.56 MHz and its vicinity.

また、各実施形態に係る「アンテナ装置」に用いられる無線給電の方式としては、例えば、電磁誘導方式及び磁界共鳴方式のような磁界結合方式がある。電磁誘導方式の無線給電規格としては、例えばＷＰＣ（Wireless Power Consortium）の策定する規格「Ｑｉ（登録商標）」がある。電磁誘導方式で使用される周波数帯は、例えば１１０ｋＨｚ以上２０５ｋＨｚ以下の範囲及び上記範囲の近傍の周波数帯に含まれている。磁界共鳴方式の無線給電規格としては、例えば、ＡｉｒＦｕｅｌ（登録商標）Ａｌｌｉａｎｃｅの策定する規格「ＡｉｒＦｕｅｌＲｅｓｏｎａｎｔ」がある。磁界共鳴方式で使用される周波数帯は、例えば６．７８ＭＨｚ帯又は１００ｋＨｚ帯である。 Further, as the wireless power feeding method used in the "antenna device" according to each embodiment, there are, for example, a magnetic field coupling method such as an electromagnetic induction method and a magnetic field resonance method. As an electromagnetic induction type wireless power supply standard, for example, there is a standard "Qi (registered trademark)" established by WPC (Wireless Power Consortium). The frequency band used in the electromagnetic induction method is included in, for example, a range of 110 kHz or more and 205 kHz or less and a frequency band in the vicinity of the above range. As a magnetic field resonance type wireless power supply standard, for example, there is a standard "AirFuel Resonant" established by Alliance (registered trademark) Alliance. The frequency band used in the magnetic field resonance method is, for example, the 6.78 MHz band or the 100 kHz band.

（実施形態１）
（１）アンテナ装置の構成
実施形態１に係るアンテナ装置１の構成について、図面を参照して説明する。 (Embodiment 1)
(1) Configuration of Antenna Device The configuration of the antenna device 1 according to the first embodiment will be described with reference to the drawings.

実施形態１に係るアンテナ装置１は、図１Ａ及び図１Ｂに示すように、アンテナ素子２を備える。アンテナ素子２は、基材３と、コイル導体４と、磁性体５と、第１平面導体６とを備える。アンテナ装置１は、第２平面導体７を更に備える。第２平面導体７は、アンテナ素子２に隣接（近接）して設けられている。 The antenna device 1 according to the first embodiment includes an antenna element 2 as shown in FIGS. 1A and 1B. The antenna element 2 includes a base material 3, a coil conductor 4, a magnetic material 5, and a first plane conductor 6. The antenna device 1 further includes a second plane conductor 7. The second plane conductor 7 is provided adjacent to (close to) the antenna element 2.

アンテナ装置１は、例えば、スマートフォン等の携帯端末、スマートウォッチ等のウェアラブル端末、ヘッドフォン、又は補聴器の近接無線通信用の「アンテナ装置」として用いられる。 The antenna device 1 is used, for example, as an "antenna device" for proximity wireless communication of a mobile terminal such as a smartphone, a wearable terminal such as a smart watch, headphones, or a hearing aid.

（２）アンテナ装置の各構成要素
以下、実施形態１に係るアンテナ装置１の各構成要素について、図面を参照して説明する。 (2) Each component of the antenna device Hereinafter, each component of the antenna device 1 according to the first embodiment will be described with reference to the drawings.

（２．１）アンテナ素子
アンテナ素子２は、図１Ａ及び図１Ｂに示すように、長方形の主面を有する形状であり、基材３と、コイル導体４と、磁性体５と、第１平面導体６とを備える。アンテナ素子２は、第１方向Ｄ１において、第２平面導体７に隣接（近接）している。なお、アンテナ素子２は、第２平面導体７と電気的絶縁性を確保できる範囲で密着してもよいし、第２平面導体７に対して隙間を介して配置されていてもよい。 (2.1) Antenna element As shown in FIGS. 1A and 1B, the antenna element 2 has a rectangular main surface, and has a base material 3, a coil conductor 4, a magnetic material 5, and a first plane. It includes a conductor 6. The antenna element 2 is adjacent to (close to) the second plane conductor 7 in the first direction D1. The antenna element 2 may be in close contact with the second plane conductor 7 within a range in which electrical insulation can be ensured, or may be arranged with respect to the second plane conductor 7 via a gap.

（２．１．１）基材
基材３は、図１Ａ及び図１Ｂに示すように、板状又はシート状であり、第１主面３１及び第２主面３２を有する。第１主面３１及び第２主面３２は、基材３の厚さ方向（第１方向Ｄ１）において、互いに対向する。 (2.1.1) Base material As shown in FIGS. 1A and 1B, the base material 3 is in the form of a plate or a sheet, and has a first main surface 31 and a second main surface 32. The first main surface 31 and the second main surface 32 face each other in the thickness direction of the base material 3 (first direction D1).

基材３は、単一の基材であり、基材３には、コイル導体４及び第１平面導体６が設けられている。基材３における外周縁と内周縁との間の幅は、コイル導体４及び第１平面導体６が設けられるのに十分な大きさである。つまり、基材３は、コイル導体４及び第１平面導体６が設けられるのに十分な大きさである。 The base material 3 is a single base material, and the base material 3 is provided with a coil conductor 4 and a first plane conductor 6. The width between the outer peripheral edge and the inner peripheral edge of the base material 3 is large enough to provide the coil conductor 4 and the first plane conductor 6. That is, the base material 3 is large enough to provide the coil conductor 4 and the first flat conductor 6.

基材３の材料は、例えば、樹脂等の電気絶縁材料である。基材３に用いられる電気絶縁材料の例としては、ポリイミド、ＰＥＴ（Poly Ethylene Terephthalate：ポリエチレンテレフタレート）、液晶ポリマー（Liquid Crystal Polymer：ＬＣＰ）が挙げられる。 The material of the base material 3 is, for example, an electrically insulating material such as a resin. Examples of the electrically insulating material used for the base material 3 include polyimide, PET (Poly Ethylene Terephthalate), and a liquid crystal polymer (LCP).

（２．１．２）コイル導体
コイル導体４は、図１Ａ及び図１Ｂに示すように、矩形状であり、基材３に設けられている。より詳細には、コイル導体４は、第１方向Ｄ１（基材３の厚さ方向）に沿った軸の周りにスパイラル状に、基材３の第１主面３１に設けられている。図１Ａの例では、コイル導体４は、３回巻かれている状態で基材３に設けられている。 (2.1.2) Coil Conductor As shown in FIGS. 1A and 1B, the coil conductor 4 has a rectangular shape and is provided on the base material 3. More specifically, the coil conductor 4 is provided on the first main surface 31 of the base material 3 in a spiral shape around an axis along the first direction D1 (thickness direction of the base material 3). In the example of FIG. 1A, the coil conductor 4 is provided on the base material 3 in a state of being wound three times.

コイル導体４の材料の例としては、銅、アルミニウムが挙げられる。例えば、エッチング又は印刷により、銅膜又はアルミニウム膜が基材３の第１主面３１上に形成されることによって、コイル導体４が基材３の第１主面３１に設けられる。なお、コイル導体４の全部が基材３の第１主面３１に設けられていることに限定されず、コイル導体４の一部又は全部が基材３の第２主面３２に設けられていてもよい。 Examples of the material of the coil conductor 4 include copper and aluminum. For example, the coil conductor 4 is provided on the first main surface 31 of the base material 3 by forming a copper film or an aluminum film on the first main surface 31 of the base material 3 by etching or printing. The entire coil conductor 4 is not limited to being provided on the first main surface 31 of the base material 3, and a part or all of the coil conductor 4 is provided on the second main surface 32 of the base material 3. You may.

コイル導体４は、第１コイル導体部４１と、第２コイル導体部４２と、複数（図示例では２つ）の第３コイル導体部４３とを有する。コイル導体４で囲まれている領域をコイル開口４４と定義する。磁性体５の第１主面５１の平面視（第１方向Ｄ１からの平面視）で、第１コイル導体部４１及び第２コイル導体部４２は、互いに重なっていない。 The coil conductor 4 has a first coil conductor portion 41, a second coil conductor portion 42, and a plurality of (two in the illustrated example) third coil conductor portions 43. The region surrounded by the coil conductor 4 is defined as the coil opening 44. In the plan view of the first main surface 51 of the magnetic body 5 (plan view from the first direction D1), the first coil conductor portion 41 and the second coil conductor portion 42 do not overlap each other.

第１コイル導体部４１は、複数（図示例では３つ）の第１導体部分を有する。第２コイル導体部４２は、複数（図示例では３つ）の第２導体部分を有する。各第３コイル導体部４３は、複数（図示例では３つ）の第３導体部分を有する。各第３コイル導体部４３は、第１コイル導体部４１と第２コイル導体部４２との間に設けられている。第１コイル導体部４１と第２コイル導体部４２とは、第３コイル導体部４３を介して一体に設けられている。そして、第１コイル導体部４１と第２コイル導体部４２と複数の第３コイル導体部４３は、互いに連続することで、スパイラル状に巻かれているように形成されている。つまり、第１コイル導体部４１の第１導体部分と第２コイル導体部４２の第１導体部分とが順番につながっている。 The first coil conductor portion 41 has a plurality of (three in the illustrated example) first conductor portions. The second coil conductor portion 42 has a plurality of (three in the illustrated example) second conductor portions. Each third coil conductor portion 43 has a plurality of (three in the illustrated example) third conductor portions. Each third coil conductor portion 43 is provided between the first coil conductor portion 41 and the second coil conductor portion 42. The first coil conductor portion 41 and the second coil conductor portion 42 are integrally provided via the third coil conductor portion 43. The first coil conductor portion 41, the second coil conductor portion 42, and the plurality of third coil conductor portions 43 are formed to be wound in a spiral shape by being continuous with each other. That is, the first conductor portion of the first coil conductor portion 41 and the first conductor portion of the second coil conductor portion 42 are connected in order.

第１コイル導体部４１は、磁性体５に対して第１主面５１側に設けられている。ここで「第１主面５１側に設けられている」とは、第２主面５２より第１主面５１に近接している配置関係を示す。言い換えると、第１コイル導体部４１は、第１方向Ｄ１において、磁性体５の第２主面５２より第１主面５１に近接して配置されている。つまり、第２主面５２、第１主面５１、及び第１コイル導体部４１は、第１方向Ｄ１において、この順に並んでいる。 The first coil conductor portion 41 is provided on the first main surface 51 side with respect to the magnetic body 5. Here, "provided on the first main surface 51 side" indicates an arrangement relationship in which the second main surface 52 is closer to the first main surface 51. In other words, the first coil conductor portion 41 is arranged closer to the first main surface 51 than the second main surface 52 of the magnetic body 5 in the first direction D1. That is, the second main surface 52, the first main surface 51, and the first coil conductor portion 41 are arranged in this order in the first direction D1.

第２コイル導体部４２は、磁性体５に対して第２主面５２側に設けられている。ここで「第２主面５２側に設けられている」とは、第１主面５１より第２主面５２に近接している配置関係を示す。言い換えると、第２コイル導体部４２は、第１方向Ｄ１において、磁性体５の第１主面５１より第２主面５２に近接して配置されている。つまり、第１主面５１、第２主面５２、及び第２コイル導体部４２は、第２方向Ｄ２において、この順に並んでいる。 The second coil conductor portion 42 is provided on the second main surface 52 side with respect to the magnetic body 5. Here, "provided on the second main surface 52 side" indicates an arrangement relationship in which the first main surface 51 is closer to the second main surface 52. In other words, the second coil conductor portion 42 is arranged closer to the second main surface 52 than the first main surface 51 of the magnetic body 5 in the first direction D1. That is, the first main surface 51, the second main surface 52, and the second coil conductor portion 42 are arranged in this order in the second direction D2.

第１方向Ｄ１からの平面視で、第２コイル導体部４２は、第２方向Ｄ２において、第１コイル導体部４１と並んで配置されている。ここで、第２方向Ｄ２は、第１方向Ｄ１と直交し、かつ、第１コイル導体部４１と第２コイル導体部４２とが並んでいる方向である。 In a plan view from the first direction D1, the second coil conductor portion 42 is arranged side by side with the first coil conductor portion 41 in the second direction D2. Here, the second direction D2 is a direction orthogonal to the first direction D1 and in which the first coil conductor portion 41 and the second coil conductor portion 42 are aligned.

また、第１コイル導体部４１及び第２コイル導体部４２は、磁性体５の第１主面５１の平面視（第１方向Ｄ１からの平面視）で、磁性体５と重なっている。 Further, the first coil conductor portion 41 and the second coil conductor portion 42 overlap with the magnetic body 5 in a plan view (plan view from the first direction D1) of the first main surface 51 of the magnetic body 5.

さらに、第１コイル導体部４１は、磁性体５の第１主面５１の平面視で、第２コイル導体部４２と重なっていない位置にある。言い換えると、第１コイル導体部４１を構成する複数の第１導体部分、及び第２コイル導体部４２を構成する複数の第２導体部分は、磁性体５の第１主面５１の平面視で、互いに重なっていない。 Further, the first coil conductor portion 41 is located at a position not overlapping the second coil conductor portion 42 in a plan view of the first main surface 51 of the magnetic body 5. In other words, the plurality of first conductor portions constituting the first coil conductor portion 41 and the plurality of second conductor portions constituting the second coil conductor portion 42 are viewed in a plan view of the first main surface 51 of the magnetic body 5. , Do not overlap each other.

コイル導体４は、２次元のコイル導体であってもよいし、３次元のコイル導体であってもよい。２次元のコイル導体とは、一の平面上において巻回軸の周りに渦巻き状に複数回巻かれているような形状のコイル導体をいう。３次元のコイル導体とは、巻回軸の周りに巻回軸に沿ってらせん状に複数回巻かれているような形状のコイル導体をいう。図１Ａ及び図１Ｂは、２次元のコイル導体を示す。 The coil conductor 4 may be a two-dimensional coil conductor or a three-dimensional coil conductor. A two-dimensional coil conductor is a coil conductor having a shape that is spirally wound a plurality of times around a winding shaft on one plane. The three-dimensional coil conductor is a coil conductor having a shape in which the coil conductor is spirally wound around the winding shaft a plurality of times along the winding shaft. 1A and 1B show a two-dimensional coil conductor.

（２．１．３）保護層
図示しない保護層は、基材３に設けられたコイル導体４を覆い、外力などから基材３及びコイル導体４を保護する。保護層は、板状又はシート状に形成されている。第１方向Ｄ１からの平面視において、保護層の平面形状は、基材３と略同じ形状である。保護層は、図示しない接着層を介して基材３の第１主面３１に貼付されている。 (2.1.3) Protective layer A protective layer (not shown) covers the coil conductor 4 provided on the base material 3 and protects the base material 3 and the coil conductor 4 from external forces and the like. The protective layer is formed in a plate shape or a sheet shape. In the plan view from the first direction D1, the planar shape of the protective layer is substantially the same as that of the base material 3. The protective layer is attached to the first main surface 31 of the base material 3 via an adhesive layer (not shown).

保護層の材料は、例えば、樹脂等の電気絶縁材料である。保護層に用いられる電気絶縁材料の例としては、ポリイミド、液晶ポリマーが挙げられる。 The material of the protective layer is, for example, an electrically insulating material such as resin. Examples of the electrically insulating material used for the protective layer include polyimide and liquid crystal polymer.

（２．１．４）磁性体
磁性体５は、図１Ａ及び図１Ｂに示すように、矩形の板状又は矩形のシート状であり、第１主面５１及び第２主面５２を有する。第１主面５１及び第２主面５２は、第１方向Ｄ１（磁性体５の厚さ方向）において、互いに対面する。磁性体５は、基材３、保護層（図示せず）、第１平面導体６、及び第２平面導体７よりも高い透磁率を有する。 (2.1.4) Magnetic material As shown in FIGS. 1A and 1B, the magnetic material 5 has a rectangular plate shape or a rectangular sheet shape, and has a first main surface 51 and a second main surface 52. The first main surface 51 and the second main surface 52 face each other in the first direction D1 (the thickness direction of the magnetic body 5). The magnetic material 5 has a higher magnetic permeability than the base material 3, the protective layer (not shown), the first plane conductor 6, and the second plane conductor 7.

磁性体５の材料は、フェライト等の強磁性材料である。磁性体５の材料の例としては、焼結体フェライト、アモルファス磁性体、磁性シートが挙げられる。磁性体５に用いられる強磁性材料の例としては、Ｍｎ−Ｚｎ−Ｆｅ系フェライト、Ｎｉ−Ｚｎ−Ｆｅ系フェライトが挙げられる。 The material of the magnetic material 5 is a ferromagnetic material such as ferrite. Examples of the material of the magnetic material 5 include sintered ferrite, amorphous magnetic material, and magnetic sheet. Examples of the ferromagnetic material used for the magnetic material 5 include Mn-Zn-Fe-based ferrite and Ni-Zn-Fe-based ferrite.

（２．１．５）第１平面導体
第１平面導体６は、図１Ａ及び図１Ｂに示すように、矩形状であり、基材３に設けられている。第１平面導体６は、コイル導体４と電気的に絶縁されている状態で、コイル導体４の外側に設けられている。より詳細には、第１平面導体６は、コイル導体４のうち、磁性体５の第１主面５１側に設けられている第１コイル導体部４１の外側に設けられている。第１平面導体６は、磁性体５に対して、第２主面５２側ではなく、第１主面５１側に位置する。 (2.1.5) First Plane Conductor The first plane conductor 6 has a rectangular shape and is provided on the base material 3 as shown in FIGS. 1A and 1B. The first plane conductor 6 is provided on the outside of the coil conductor 4 in a state of being electrically insulated from the coil conductor 4. More specifically, the first plane conductor 6 is provided outside the first coil conductor portion 41 provided on the first main surface 51 side of the magnetic body 5 in the coil conductor 4. The first plane conductor 6 is located not on the second main surface 52 side but on the first main surface 51 side with respect to the magnetic body 5.

上記のように第１平面導体６が設けられていることにより、第１平面導体６は、コイル導体４と導通しない。言い換えれば、第１平面導体６は、導体によってコイル導体４と物理的に連続していない（直流的に接続されていない）。また、第１平面導体６は、磁性体５の第１主面５１の平面視（第１方向Ｄ１からの平面視）で、コイル導体４と重なっていない。さらに、第１平面導体６の一部は、磁性体５の第１主面５１の平面視（第１方向Ｄ１からの平面視）で、第１主面５１と対向するように磁性体５と重なっている。 Since the first plane conductor 6 is provided as described above, the first plane conductor 6 does not conduct with the coil conductor 4. In other words, the first plane conductor 6 is not physically continuous with the coil conductor 4 by the conductor (not connected in a direct current manner). Further, the first plane conductor 6 does not overlap with the coil conductor 4 in the plan view (plan view from the first direction D1) of the first main surface 51 of the magnetic body 5. Further, a part of the first plane conductor 6 is with the magnetic body 5 so as to face the first main surface 51 in a plan view (plan view from the first direction D1) of the first main surface 51 of the magnetic body 5. overlapping.

上述したように、第１平面導体６が第１コイル導体部４１の外側に設けられていることにより、第１コイル導体部４１は、磁性体５の第１主面５１の平面視で、第１平面導体６と第２コイル導体部４２との間に位置する。 As described above, since the first plane conductor 6 is provided outside the first coil conductor portion 41, the first coil conductor portion 41 is the first in a plan view of the first main surface 51 of the magnetic body 5. It is located between the 1-plane conductor 6 and the second coil conductor portion 42.

また、第１平面導体６は、コイル導体４において相手側コイル導体９１（図３参照）側に設けられていることにより、相手側コイル導体９１からコイル導体４の外側を通る磁束φ３（図４参照）を磁性体５に通りにくくする機能を有する。相手側コイル導体９１は、アンテナ装置１の通信相手である相手側アンテナ装置９に設けられている。 Further, since the first plane conductor 6 is provided on the mating side coil conductor 91 (see FIG. 3) side of the coil conductor 4, the magnetic flux φ3 (FIG. 4) passing from the mating side coil conductor 91 to the outside of the coil conductor 4 is provided. It has a function of making it difficult for the magnetic material 5 to pass through. The other-side coil conductor 91 is provided in the other-side antenna device 9 which is a communication partner of the antenna device 1.

これにより、コイル導体４の外側を通る磁束φ３（図４参照）が磁性体５を通りにくくすることができるので、コイル導体４で囲まれているコイル開口４４を通る磁束φ２（図４参照）と、コイル導体４の外側を通る磁束φ３とが打ち消し合うことを低減できる。その結果、相手側アンテナ装置９との通信可能エリアを広げることができる。 As a result, the magnetic flux φ3 passing through the outside of the coil conductor 4 (see FIG. 4) can be made difficult to pass through the magnetic body 5, so that the magnetic flux φ2 passing through the coil opening 44 surrounded by the coil conductor 4 (see FIG. 4) And the magnetic flux φ3 passing through the outside of the coil conductor 4 can be reduced from canceling each other. As a result, the communicable area with the other antenna device 9 can be expanded.

ところで、第１平面導体６は、コイル導体４と共に、基材３の第１主面３１上に設けられている。言い換えれば、基材３は、コイル導体４及び第１平面導体６が設けられている一の基材である。より詳細には、アンテナ装置１の製造時において、第１平面導体６は、コイル導体４と同時に、基材３の第１主面上に形成される。これにより、コイル導体４と第１平面導体６とを安価で一度に形成することができる。 By the way, the first plane conductor 6 is provided on the first main surface 31 of the base material 3 together with the coil conductor 4. In other words, the base material 3 is one base material provided with the coil conductor 4 and the first plane conductor 6. More specifically, at the time of manufacturing the antenna device 1, the first plane conductor 6 is formed on the first main surface of the base material 3 at the same time as the coil conductor 4. As a result, the coil conductor 4 and the first plane conductor 6 can be formed at one time at low cost.

なお、第１平面導体６の形状は完全な平面であることに限定されない。ここでは、第１平面導体６の第１方向Ｄ１における寸法（第１平面導体６の厚さ）又は第１方向Ｄ１における寸法に比べて小さい凹凸があっても、平面といえる。なお、第１平面導体６は、曲面を有する面状導体であってもよい。 The shape of the first flat conductor 6 is not limited to a perfect flat surface. Here, even if there are irregularities smaller than the dimensions of the first plane conductor 6 in the first direction D1 (thickness of the first plane conductor 6) or the dimensions in the first direction D1, it can be said to be a flat surface. The first planar conductor 6 may be a planar conductor having a curved surface.

（２．２）第２平面導体
第２平面導体７は、図１Ａ及び図１Ｂに示すように、第１平面導体６と異なる導体であり、例えば長方形状である。第２平面導体７では、第１方向Ｄ１の寸法に対する第２方向Ｄ２の寸法の寸法比が１よりも大きく、かつ、第１方向Ｄ１の寸法に対する第３方向Ｄ３の寸法の寸法比が１よりも大きい。つまり、第２平面導体７は、第１方向Ｄ１の寸法よりも第２方向Ｄ２の寸法及び第３方向Ｄ３の寸法の方が長い平面導体である。第３方向Ｄ３は、第１方向Ｄ１及び第２方向Ｄ２の両方と直交する方向である。 (2.2) Second Planar Conductor As shown in FIGS. 1A and 1B, the second plane conductor 7 is a conductor different from the first plane conductor 6, and is, for example, rectangular. In the second plane conductor 7, the dimension ratio of the dimension of the second direction D2 to the dimension of the first direction D1 is larger than 1, and the dimension ratio of the dimension of the third direction D3 to the dimension of the first direction D1 is more than 1. Is also big. That is, the second plane conductor 7 is a plane conductor in which the dimensions of the second direction D2 and the dimensions of the third direction D3 are longer than the dimensions of the first direction D1. The third direction D3 is a direction orthogonal to both the first direction D1 and the second direction D2.

第２平面導体７は、磁性体５の第２主面５２と対向する。より詳細には、第２平面導体７は、主面７１を有し、第１方向Ｄ１において主面７１がアンテナ素子２と対向するように配置されている。言い換えると、第２平面導体７は、第２平面導体７の主面７１の平面視で、少なくとも一部がアンテナ素子２と重なるように配置されている。より詳細には、第２平面導体７は、第１方向Ｄ１において、磁性体５の第２主面５２側に配置されている。言い換えると、第２平面導体７は、第１方向Ｄ１において、磁性体５の第１主面５１よりも第２主面５２に近接して配置されている。主面７１は長方形状の平面である。 The second plane conductor 7 faces the second main surface 52 of the magnetic body 5. More specifically, the second plane conductor 7 has a main surface 71, and the main surface 71 is arranged so as to face the antenna element 2 in the first direction D1. In other words, the second plane conductor 7 is arranged so that at least a part thereof overlaps with the antenna element 2 in the plan view of the main surface 71 of the second plane conductor 7. More specifically, the second plane conductor 7 is arranged on the second main surface 52 side of the magnetic body 5 in the first direction D1. In other words, the second plane conductor 7 is arranged closer to the second main surface 52 than the first main surface 51 of the magnetic body 5 in the first direction D1. The main surface 71 is a rectangular flat surface.

第２平面導体７は、磁性体５の第１主面５１の平面視で、磁性体５と重なっており、かつ、コイル導体４で囲まれているコイル開口４４と重なっている。また、第２平面導体７は、磁性体５の第１主面５１の平面視で、第１平面導体６と重なっている。さらに、第２平面導体７は、磁性体５の第１主面５１の平面視で、コイル導体４と重なっている。言い換えると、第２平面導体７は、磁性体５の第１主面５１の平面視で、第１コイル導体部４１及び第２コイル導体部４２の両方と重なっている。実施形態１では、第２平面導体７は、磁性体５の第１主面５１の平面視で、コイル導体４の全部、コイル開口４４の全部、磁性体５の全部、及び第１平面導体６の全部と重なっている。 The second plane conductor 7 overlaps with the magnetic body 5 and overlaps with the coil opening 44 surrounded by the coil conductor 4 in the plan view of the first main surface 51 of the magnetic body 5. Further, the second plane conductor 7 overlaps with the first plane conductor 6 in the plan view of the first main surface 51 of the magnetic body 5. Further, the second plane conductor 7 overlaps with the coil conductor 4 in a plan view of the first main surface 51 of the magnetic body 5. In other words, the second plane conductor 7 overlaps with both the first coil conductor portion 41 and the second coil conductor portion 42 in a plan view of the first main surface 51 of the magnetic body 5. In the first embodiment, the second plane conductor 7 is a plan view of the first main surface 51 of the magnetic body 5, all of the coil conductors 4, all of the coil openings 44, all of the magnetic material 5, and the first plane conductor 6. It overlaps with all of.

上記より、コイル導体４で囲まれているコイル開口４４を通る磁束φ２（図４参照）が、第２平面導体７を避けて磁性体５を通りやすくすることができる。 From the above, the magnetic flux φ2 (see FIG. 4) passing through the coil opening 44 surrounded by the coil conductor 4 can easily pass through the magnetic material 5 while avoiding the second plane conductor 7.

第２平面導体７の材料は、例えば、金属等の導体である。第２平面導体７の材料の例としては、アルミニウム、ステンレス、銅が挙げられる。第２平面導体７は、単体の導体に限定されず、他の部品（例えば、シールドケース、バッテリ）の一部を構成する導体であってもよい。 The material of the second plane conductor 7 is, for example, a conductor such as metal. Examples of the material of the second flat conductor 7 include aluminum, stainless steel, and copper. The second plane conductor 7 is not limited to a single conductor, and may be a conductor that forms a part of another component (for example, a shield case or a battery).

なお、第２平面導体７において、アンテナ素子２と対向する主面７１が完全な平面であることに限定されない。ここでは、第２平面導体７の第１方向Ｄ１における寸法（第２平面導体７の厚さ）又は第２方向Ｄ２における寸法に比べて小さい凹凸があっても、平面といえる。また、主面７１の全てが平面であることに限定されない。すなわち、主面７１は、少なくとも一部において、平面であってもよい。なお、第２平面導体７は、曲面を有する面状導体であってもよい。 In the second plane conductor 7, the main surface 71 facing the antenna element 2 is not limited to a perfect plane. Here, even if there are irregularities smaller than the dimensions of the second plane conductor 7 in the first direction D1 (thickness of the second plane conductor 7) or the dimensions in the second direction D2, it can be said to be a flat surface. Further, not all of the main surfaces 71 are not limited to being flat. That is, the main surface 71 may be a flat surface at least in part. The second planar conductor 7 may be a planar conductor having a curved surface.

第２平面導体７の外縁は、磁性体５の第１主面５１の平面視（第１方向Ｄ１からの平面視）で、コイル導体４の外縁よりも外側に位置するように設けられている。より詳細には、第１コイル導体部４１と第２コイル導体部４２とが並んでいる方向すなわち第２方向Ｄ２において、第２平面導体７の外縁は、第１コイル導体部４１の外縁よりも外側に位置し、かつ、第２コイル導体部４２の外縁よりも外側に位置する。同様に、第１コイル導体部４１と第２コイル導体部４２とが並んでいる方向と直交する方向すなわち第３方向Ｄ３において、第２平面導体７の外縁は、第３コイル導体部４３の外縁よりも外側に位置する。 The outer edge of the second plane conductor 7 is provided so as to be located outside the outer edge of the coil conductor 4 in the plan view (plan view from the first direction D1) of the first main surface 51 of the magnetic body 5. .. More specifically, in the direction in which the first coil conductor portion 41 and the second coil conductor portion 42 are arranged side by side, that is, in the second direction D2, the outer edge of the second plane conductor 7 is larger than the outer edge of the first coil conductor portion 41. It is located on the outside and outside the outer edge of the second coil conductor portion 42. Similarly, in the direction orthogonal to the direction in which the first coil conductor portion 41 and the second coil conductor portion 42 are arranged, that is, in the third direction D3, the outer edge of the second plane conductor 7 is the outer edge of the third coil conductor portion 43. Located on the outside.

（２．３）アンテナ装置の通信面
アンテナ装置１は、磁性体５の第１主面５１側を主な通信面とする。ここで「主な通信面」とは通信相手と通信する際に、相手側アンテナ装置９の相手側コイル導体９１（図４参照）に主に近接させる面である。つまり、アンテナ装置１は、磁性体５の第２主面５２に近接する通信相手よりも、第１主面５１に近接する通信相手と通信を行うことを主とする。一方、磁性体５の第２主面５２は、第１主面５１に比べて、第２平面導体７に近接する。 (2.3) Communication surface of the antenna device The antenna device 1 has the first main surface 51 side of the magnetic body 5 as the main communication surface. Here, the "main communication surface" is a surface that is mainly brought close to the other side coil conductor 91 (see FIG. 4) of the other side antenna device 9 when communicating with the communication partner. That is, the antenna device 1 mainly communicates with a communication partner close to the first main surface 51 rather than a communication partner close to the second main surface 52 of the magnetic body 5. On the other hand, the second main surface 52 of the magnetic body 5 is closer to the second plane conductor 7 than the first main surface 51.

（３）アンテナ装置の動作
以下、実施形態１に係るアンテナ装置１の動作について、図２Ａ、図２Ｂ、図３、及び図４を参照して説明する。図２Ａ及び図２Ｂに示すように、アンテナ装置１の通信相手である相手側アンテナ装置９の相手側コイル導体９１がコイル導体４と平行に位置する場合におけるアンテナ装置１の動作について説明する。 (3) Operation of Antenna Device The operation of the antenna device 1 according to the first embodiment will be described below with reference to FIGS. 2A, 2B, 3 and 4. As shown in FIGS. 2A and 2B, the operation of the antenna device 1 when the other side coil conductor 91 of the other side antenna device 9 which is the communication partner of the antenna device 1 is positioned parallel to the coil conductor 4 will be described.

相手側アンテナ装置９では、相手側コイル導体９１に電流が流れると、図４に示すように、磁束φ１が発生する。より詳細には、相手側コイル導体９１に電流が流れると、相手側コイル導体９１で囲まれているコイル開口９２を通る磁束φ１が発生する。 In the mating side antenna device 9, when a current flows through the mating side coil conductor 91, a magnetic flux φ1 is generated as shown in FIG. More specifically, when a current flows through the mating coil conductor 91, a magnetic flux φ1 is generated through the coil opening 92 surrounded by the mating coil conductor 91.

相手側アンテナ装置９からの磁束φ１の一部（磁束φ２）は、コイル導体４で囲まれているコイル開口４４を通る。コイル開口４４を通る磁束φ２は、磁性体５の第１主面５１の方向（第２方向Ｄ２）に沿って、磁性体５の内部を通る。一方、相手側アンテナ装置９からの磁束φ１の他の一部（磁束φ３）は、コイル導体４の外側を通る。コイル導体４の外側を通る磁束φ３の経路は、第１平面導体６を貫通する経路をとりにくいため、コイル導体４の外側を通る磁束φ３は、磁性体５を通りにくくなる。 A part of the magnetic flux φ1 (magnetic flux φ2) from the other side antenna device 9 passes through the coil opening 44 surrounded by the coil conductor 4. The magnetic flux φ2 passing through the coil opening 44 passes through the inside of the magnetic body 5 along the direction of the first main surface 51 of the magnetic body 5 (second direction D2). On the other hand, another part of the magnetic flux φ1 (magnetic flux φ3) from the other side antenna device 9 passes through the outside of the coil conductor 4. Since the path of the magnetic flux φ3 passing through the outside of the coil conductor 4 is difficult to take a path passing through the first plane conductor 6, the magnetic flux φ3 passing through the outside of the coil conductor 4 is difficult to pass through the magnetic body 5.

上記より、磁性体５の内部において、コイル開口４４を通る磁束φ２とコイル導体４の外側を通る磁束φ３とは打ち消し合うことを低減できるので、通信特性を高めることができる。 From the above, it is possible to reduce the cancellation of the magnetic flux φ2 passing through the coil opening 44 and the magnetic flux φ3 passing outside the coil conductor 4 inside the magnetic body 5, so that the communication characteristics can be improved.

図２Ａ及び図２Ｂにおいて、コイル導体４の巻回軸の方向すなわち第１方向Ｄ１からの平面視において磁性体５の重心（中心）の位置座標をＸ＝０とする。図３中の特性Ａ１は、第１コイル導体部４１と第２コイル導体部４２とが並んでいる方向すなわち第２方向Ｄ２（Ｘ軸方向）において、コイル導体４に対して相手側コイル導体９１を移動した場合の結合特性を示す。図３中の特性Ａ２は、比較例として、第１平面導体６が設けられていないアンテナ装置の結合特性を示す。 In FIGS. 2A and 2B, the position coordinates of the center of gravity (center) of the magnetic body 5 are set to X = 0 in the direction of the winding axis of the coil conductor 4, that is, in the plan view from the first direction D1. The characteristic A1 in FIG. 3 shows the coil conductor 91 on the opposite side with respect to the coil conductor 4 in the direction in which the first coil conductor portion 41 and the second coil conductor portion 42 are arranged side by side, that is, in the second direction D2 (X-axis direction). Shows the binding characteristics when moving. The characteristic A2 in FIG. 3 shows, as a comparative example, the coupling characteristic of the antenna device not provided with the first plane conductor 6.

図３に示すように、Ｘが大きくなるほど、結合係数が大きくなる。Ｘが−１０ｍｍ以上２０ｍｍ以下の範囲では、Ｘ＝２０ｍｍのとき、結合係数が最大値となる。言い換えると、結合係数は、相手側アンテナ装置９の相手側コイル導体９１が第２コイル導体部４２側に向かって磁性体５の重心から離れるほど大きくなる。結合係数の最大値は、相手側アンテナ装置９の相手側コイル導体９１が磁性体５の重心から２０ｍｍ離れた位置にあるときである。 As shown in FIG. 3, the larger X is, the larger the coupling coefficient is. In the range where X is -10 mm or more and 20 mm or less, the coupling coefficient becomes the maximum value when X = 20 mm. In other words, the coupling coefficient increases as the mating coil conductor 91 of the mating antenna device 9 moves away from the center of gravity of the magnetic material 5 toward the second coil conductor portion 42 side. The maximum value of the coupling coefficient is when the mating coil conductor 91 of the mating antenna device 9 is located 20 mm away from the center of gravity of the magnetic body 5.

また、実施形態１に係るアンテナ装置の場合、Ｘが−１０ｍｍ以上０ｍｍ以下の範囲においても、結合係数が１．０％以上である。 Further, in the case of the antenna device according to the first embodiment, the coupling coefficient is 1.0% or more even in the range where X is −10 mm or more and 0 mm or less.

一方、比較例のアンテナ装置の場合、Ｘが−１０ｍｍ以上２０ｍｍ以下の範囲の全てにおいて、比較例のアンテナ装置の結合係数は、実施形態１に係るアンテナ装置１の結合係数よりも小さい。特に、Ｘが−１０ｍｍ以上−５ｍｍ以下の範囲では、結合係数が１．０以下である。 On the other hand, in the case of the antenna device of the comparative example, the coupling coefficient of the antenna device of the comparative example is smaller than the coupling coefficient of the antenna device 1 according to the first embodiment in all the range where X is −10 mm or more and 20 mm or less. In particular, in the range where X is −10 mm or more and −5 mm or less, the coupling coefficient is 1.0 or less.

したがって、実施形態１に係るアンテナ装置１の方が比較例のアンテナ装置よりも、広範囲で通信特性を向上させることができる。 Therefore, the antenna device 1 according to the first embodiment can improve the communication characteristics in a wider range than the antenna device of the comparative example.

（４）効果
実施形態１に係るアンテナ装置１では、第１平面導体６が、コイル導体４と導通せず、かつ、磁性体５の第１主面５１の平面視で、コイル導体４と重なる。また、第１平面導体６の少なくとも一部が、磁性体５の第１主面５１の平面視で、第１主面５１と対向するように磁性体５と重なっている。さらに、第１コイル導体部４１が、磁性体５の第１主面５１の平面視で、第１平面導体６と第２コイル導体部４２との間に位置する。これにより、コイル導体４の外側を通る磁束φ３の経路を第１平面導体６で変えて、コイル導体４の外側を通る磁束φ３が磁性体５を通ることを難しくすることができる。その結果、コイル開口４４を通る磁束φ２と、コイル導体４の外側を通る磁束φ３とが打ち消し合うことを低減できるので、相手側アンテナ装置９との通信可能エリアを広げることができる。 (4) Effect In the antenna device 1 according to the first embodiment, the first plane conductor 6 does not conduct with the coil conductor 4 and overlaps with the coil conductor 4 in the plan view of the first main surface 51 of the magnetic body 5. .. Further, at least a part of the first plane conductor 6 overlaps with the magnetic body 5 so as to face the first main surface 51 in a plan view of the first main surface 51 of the magnetic body 5. Further, the first coil conductor portion 41 is located between the first plane conductor 6 and the second coil conductor portion 42 in a plan view of the first main surface 51 of the magnetic body 5. As a result, the path of the magnetic flux φ3 passing through the outside of the coil conductor 4 can be changed by the first plane conductor 6, making it difficult for the magnetic flux φ3 passing outside the coil conductor 4 to pass through the magnetic material 5. As a result, it is possible to reduce the cancellation of the magnetic flux φ2 passing through the coil opening 44 and the magnetic flux φ3 passing through the outside of the coil conductor 4, so that the communicable area with the other antenna device 9 can be widened.

実施形態１に係るアンテナ装置１では、第２平面導体７が、磁性体５の第１主面５１の平面視で、磁性体５と重なっており、かつ、コイル導体４で囲まれているコイル開口４４と重なっている。これにより、コイル開口４４を通る磁束φ２の経路を第２平面導体７で変えて、コイル開口４４を通る磁束φ２が、第２平面導体７を避けて磁性体５を通りやすくすることができる。 In the antenna device 1 according to the first embodiment, the second plane conductor 7 is a coil that overlaps with the magnetic body 5 and is surrounded by the coil conductor 4 in the plan view of the first main surface 51 of the magnetic body 5. It overlaps with the opening 44. As a result, the path of the magnetic flux φ2 passing through the coil opening 44 can be changed by the second plane conductor 7, and the magnetic flux φ2 passing through the coil opening 44 can easily pass through the magnetic body 5 while avoiding the second plane conductor 7.

実施形態１に係るアンテナ装置１では、コイル導体４及び第１平面導体６が同一の基材３に設けられている。これにより、コイル導体４と第１平面導体６とを安価で一度に形成することができる。 In the antenna device 1 according to the first embodiment, the coil conductor 4 and the first plane conductor 6 are provided on the same base material 3. As a result, the coil conductor 4 and the first plane conductor 6 can be formed at one time at low cost.

（５）変形例
以下、実施形態１の変形例について説明する。 (5) Modification Example The modification of the first embodiment will be described below.

実施形態１の変形例１として、図５Ａに示すように、第２平面導体７は、磁性体５の第１主面５１の平面視で、磁性体５の全部及び第１平面導体６の全部と重なっていることに限定されず、磁性体５の一部のみ及び第１平面導体６の一部のみと重なっていてもよい。変形例１に係るアンテナ装置１においても、第２平面導体７は、磁性体５の第１主面５１の平面視で、コイル開口４４と重なっている。これにより、コイル開口４４を通る磁束φ２（図４参照）が第２平面導体７を避けて磁性体５の内部を通りやすくすることができるので、アンテナ特性を向上させることができる。 As a modification 1 of the first embodiment, as shown in FIG. 5A, the second plane conductor 7 is a plan view of the first main surface 51 of the magnetic body 5, and all of the magnetic body 5 and all of the first plane conductor 6. It is not limited to overlapping with, and may overlap with only a part of the magnetic material 5 and a part of the first plane conductor 6. Also in the antenna device 1 according to the first modification, the second plane conductor 7 overlaps the coil opening 44 in a plan view of the first main surface 51 of the magnetic body 5. As a result, the magnetic flux φ2 (see FIG. 4) passing through the coil opening 44 can easily pass through the inside of the magnetic body 5 while avoiding the second plane conductor 7, so that the antenna characteristics can be improved.

実施形態１の変形例２として、図５Ｂに示すように、第２平面導体７は、磁性体５の第１主面５１の平面視で、第１平面導体６と重なっていなくもよい。変形例２に係るアンテナ装置１では、第２平面導体７は、コイル開口４４の全部及び磁性体５の一部のみと重なっている。これにより、コイル開口４４を通る磁束φ２（図４参照）が第２平面導体７を避けて磁性体５の内部を通りやすくすることができるので、アンテナ特性を向上させることができる。 As a modification 2 of the first embodiment, as shown in FIG. 5B, the second plane conductor 7 does not have to overlap with the first plane conductor 6 in the plan view of the first main surface 51 of the magnetic body 5. In the antenna device 1 according to the second modification, the second plane conductor 7 overlaps the entire coil opening 44 and only a part of the magnetic material 5. As a result, the magnetic flux φ2 (see FIG. 4) passing through the coil opening 44 can easily pass through the inside of the magnetic body 5 while avoiding the second plane conductor 7, so that the antenna characteristics can be improved.

実施形態１の変形例３として、図５Ｃに示すように、第２平面導体７は、磁性体５の第１主面５１の平面視で、第１コイル導体部４１と重なっていることに限定されず、第１コイル導体部４１と重なっていなくてもよい。要するに、第２平面導体７は、磁性体５の第１主面５１の平面視で、コイル導体４のうち少なくとも第２コイル導体部４２と重なっていればよい。変形例３に係るアンテナ装置１においても、第２平面導体７は、磁性体５の第１主面５１の平面視で、コイル開口４４と重なっている。これにより、コイル開口４４を通る磁束φ２（図４参照）が第２平面導体７を避けて磁性体５の内部を通りやすくすることができるので、アンテナ特性を向上させることができる。 As a modification 3 of the first embodiment, as shown in FIG. 5C, the second plane conductor 7 is limited to overlapping with the first coil conductor portion 41 in the plan view of the first main surface 51 of the magnetic body 5. It does not have to overlap with the first coil conductor portion 41. In short, the second plane conductor 7 may overlap with at least the second coil conductor portion 42 of the coil conductors 4 in a plan view of the first main surface 51 of the magnetic body 5. Also in the antenna device 1 according to the third modification, the second plane conductor 7 overlaps with the coil opening 44 in the plan view of the first main surface 51 of the magnetic body 5. As a result, the magnetic flux φ2 (see FIG. 4) passing through the coil opening 44 can easily pass through the inside of the magnetic body 5 while avoiding the second plane conductor 7, so that the antenna characteristics can be improved.

実施形態１の変形例４として、図６Ａに示すように、第１平面導体６は、第１方向Ｄ１において、基材３を介して磁性体５の第１主面５１に近接していることに限定されず、磁性体５の第１主面５１から離れて設けられていてもよい。つまり、第１方向Ｄ１において、第１平面導体６の位置とコイル導体４の位置とが異なる。変形例４の場合、第１平面導体６は、コイル導体４とは異なるタイミングで形成される。変形例４に係るアンテナ装置１においても、第１平面導体６によって、コイル導体４の外側を通る磁束φ３（図４参照）が磁性体５を通りにくくすることができるので、アンテナ特性を向上させることができる。ただし、変形例４に比べて実施形態１の方が、第１平面導体６が磁性体５に近接しているため、磁束φ３が磁性体５を通りにくくする効果は大きい。 As a modification 4 of the first embodiment, as shown in FIG. 6A, the first plane conductor 6 is close to the first main surface 51 of the magnetic body 5 via the base material 3 in the first direction D1. The magnetic body 5 may be provided apart from the first main surface 51. That is, in the first direction D1, the position of the first plane conductor 6 and the position of the coil conductor 4 are different. In the case of the modified example 4, the first plane conductor 6 is formed at a timing different from that of the coil conductor 4. Also in the antenna device 1 according to the modified example 4, the first plane conductor 6 makes it difficult for the magnetic flux φ3 (see FIG. 4) passing outside the coil conductor 4 to pass through the magnetic body 5, so that the antenna characteristics are improved. be able to. However, since the first plane conductor 6 is closer to the magnetic body 5 in the first embodiment than in the modified example 4, the effect of making the magnetic flux φ3 difficult to pass through the magnetic body 5 is greater.

実施形態１の変形例５として、図６Ｂに示すように、アンテナ装置１は、第２平面導体７を備えなくてもよい。つまり、第２平面導体７は、必須の構成でなくてもよい。変形例５に係るアンテナ装置１は、アンテナ素子２のみを備える。変形例５に係るアンテナ装置１においても、第１平面導体６によって、コイル導体４の外側を通る磁束φ３（図４参照）が磁性体５を通りにくくすることができるので、アンテナ特性を向上させることができる。 As a modification 5 of the first embodiment, as shown in FIG. 6B, the antenna device 1 does not have to include the second plane conductor 7. That is, the second plane conductor 7 does not have to have an essential configuration. The antenna device 1 according to the modified example 5 includes only the antenna element 2. Also in the antenna device 1 according to the modified example 5, the first plane conductor 6 makes it difficult for the magnetic flux φ3 (see FIG. 4) passing through the outside of the coil conductor 4 to pass through the magnetic body 5, so that the antenna characteristics are improved. be able to.

なお、実施形態１の他の変形例として、基材３は、単一の基材であることに限定されず、複数の基材の組合せであってもよい。 As another modification of the first embodiment, the base material 3 is not limited to a single base material, and may be a combination of a plurality of base materials.

上記の各変形例に係るアンテナ装置１においても、実施形態１に係るアンテナ装置１と同様の効果を奏する。 The antenna device 1 according to each of the above modifications also has the same effect as the antenna device 1 according to the first embodiment.

（実施形態２）
実施形態２では、実施形態１に係るアンテナ装置１が用いられた電子機器８について、図７Ａ及び図７Ｂを参照して説明する。 (Embodiment 2)
In the second embodiment, the electronic device 8 in which the antenna device 1 according to the first embodiment is used will be described with reference to FIGS. 7A and 7B.

（１）構成
電子機器８は、図７Ａ及び図７Ｂに示すように、アンテナ装置１と、筐体８１と、制御部８２と、プリント配線板８３と、バッテリ８４と、ディスプレイデバイス８５とを備える。なお、実施形態２に係るアンテナ装置１に関し、実施形態１に係るアンテナ装置１と同様の構成要素については、同一の符号を付して説明を省略する。 (1) Configuration As shown in FIGS. 7A and 7B, the electronic device 8 includes an antenna device 1, a housing 81, a control unit 82, a printed wiring board 83, a battery 84, and a display device 85. .. Regarding the antenna device 1 according to the second embodiment, the same components as those of the antenna device 1 according to the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

電子機器８は、例えば、スマートフォン等の携帯端末、又は、スマートウォッチ等のウェアラブル端末、ヘッドフォン、又は補聴器である。図７Ａ及び図７Ｂは、電子機器８として、スマートフォンを示す。 The electronic device 8 is, for example, a mobile terminal such as a smartphone, a wearable terminal such as a smart watch, headphones, or a hearing aid. 7A and 7B show a smartphone as the electronic device 8.

筐体８１は、直方体状であり、アンテナ装置１と制御部８２とプリント配線板８３とバッテリ８４とを収容する。制御部８２は、プリント配線板８３の表面に実装された複数の回路素子８６で構成されており、アンテナ装置１を制御する。バッテリ８４は、電子機器８を駆動するための電源である。ディスプレイデバイス８５は、所定の情報を表示する。 The housing 81 has a rectangular parallelepiped shape and houses the antenna device 1, the control unit 82, the printed wiring board 83, and the battery 84. The control unit 82 is composed of a plurality of circuit elements 86 mounted on the surface of the printed wiring board 83, and controls the antenna device 1. The battery 84 is a power source for driving the electronic device 8. The display device 85 displays predetermined information.

実施形態２に係る電子機器８では、第１コイル導体部４１と第２コイル導体部４２とが並んでいる第２方向Ｄ２が筐体８１の長手方向Ｄ４１に沿うように、アンテナ装置１が筐体８１内に配置されている。 In the electronic device 8 according to the second embodiment, the antenna device 1 is housed so that the second direction D2 in which the first coil conductor portion 41 and the second coil conductor portion 42 are arranged is along the longitudinal direction D41 of the housing 81. It is arranged in the body 81.

アンテナ装置１は、筐体８１の厚さ方向Ｄ４３からの平面視で、アンテナ素子２がプリント配線板８３と重なるように、筐体８１に設けられている。より詳細には、アンテナ素子２は、筐体８１の背面８１１側の内面のうちプリント配線板８３と対向する部分に設けられている。アンテナ素子２は、例えば接着剤等により、筐体８１の背面８１１側の内面に貼付されている。 The antenna device 1 is provided in the housing 81 so that the antenna element 2 overlaps with the printed wiring board 83 in a plan view from the thickness direction D43 of the housing 81. More specifically, the antenna element 2 is provided on the inner surface of the housing 81 on the back surface 811 side, which faces the printed wiring board 83. The antenna element 2 is attached to the inner surface of the housing 81 on the back surface 811 side with, for example, an adhesive or the like.

図７Ａ及び図７Ｂのようにアンテナ素子２がプリント配線板８３に重なっている状態において、プリント配線板８３に設けられているシールドケース８７が第２平面導体７となる。 In a state where the antenna element 2 overlaps the printed wiring board 83 as shown in FIGS. 7A and 7B, the shield case 87 provided on the printed wiring board 83 serves as the second flat conductor 7.

ところで、実施形態２では、筐体８１の厚さ方向Ｄ４３において、第１平面導体６は、磁性体５と筐体８１との間に位置する。筐体８１の背面側に相手側アンテナ装置９（図２Ａ参照）が近接すると、アンテナ装置１と相手側アンテナ装置９とで通信を行われる。 By the way, in the second embodiment, in the thickness direction D43 of the housing 81, the first plane conductor 6 is located between the magnetic material 5 and the housing 81. When the other side antenna device 9 (see FIG. 2A) approaches the back side of the housing 81, the antenna device 1 and the other side antenna device 9 communicate with each other.

（２）効果
実施形態２に係る電子機器８によれば、実施形態１と同様、アンテナ装置１において、広範囲で通信特性を向上させることができるので、相手側アンテナ装置との通信可能エリアを広げることができる。 (2) Effect According to the electronic device 8 according to the second embodiment, the communication characteristics can be improved in a wide range in the antenna device 1 as in the first embodiment, so that the communicable area with the antenna device on the other side is expanded. be able to.

（３）変形例
実施形態２の変形例として、第１コイル導体部４１と第２コイル導体部４２とが並んでいる第２方向Ｄ２が筐体８１の短手方向Ｄ４２に沿うように、アンテナ装置１が筐体８１内に配置されていてもよい。 (3) Modification Example As a modification of the second embodiment, the antenna is provided so that the second direction D2 in which the first coil conductor portion 41 and the second coil conductor portion 42 are arranged is along the lateral direction D42 of the housing 81. The device 1 may be arranged in the housing 81.

アンテナ装置１は、筐体８１の厚さ方向Ｄ４３からの平面視で、アンテナ素子２がバッテリ８４と重なるように、筐体８１に設けられていてもよい。より詳細には、アンテナ素子２は、筐体８１の背面８１１側の内面のうちバッテリ８４と対向する部分に設けられている。この場合、バッテリ８４のバッテリケース８４１が第２平面導体７となる。 The antenna device 1 may be provided in the housing 81 so that the antenna element 2 overlaps with the battery 84 in a plan view from the thickness direction D43 of the housing 81. More specifically, the antenna element 2 is provided on a portion of the inner surface of the housing 81 on the back surface 811 side facing the battery 84. In this case, the battery case 841 of the battery 84 serves as the second plane conductor 7.

実施形態２の他の変形例として、電子機器８は、アンテナ装置１に代えて、実施形態１の変形例に係るアンテナ装置１のいずれかを備えてもよい。 As another modification of the second embodiment, the electronic device 8 may include any of the antenna devices 1 according to the modification of the first embodiment instead of the antenna device 1.

上記の各変形例に係る電子機器８においても、実施形態２に係る電子機器８と同様の効果を奏する。 The electronic device 8 according to each of the above modifications also has the same effect as the electronic device 8 according to the second embodiment.

以上説明した実施形態及び変形例は、本発明の様々な実施形態及び変形例の一部に過ぎない。また、実施形態及び変形例は、本発明の目的を達成できれば、設計等に応じて種々の変更が可能である。 The embodiments and modifications described above are only a part of various embodiments and modifications of the present invention. Further, the embodiments and modifications can be variously changed according to the design and the like as long as the object of the present invention can be achieved.

（態様）
以上説明した実施形態及び変形例より以下の態様が開示されている。 (Aspect)
The following aspects are disclosed from the embodiments and modifications described above.

第１の態様に係るアンテナ装置（１）は、コイル導体（４）と、磁性体（５）と、第１平面導体（６）とを備える。コイル導体（４）は、第１コイル導体部（４１）及び第２コイル導体部（４２）を有する。磁性体（５）は、第１主面（５１）及び第２主面（５２）を有する。第１コイル導体部（４１）は、第１主面（５１）側に設けられている。第２コイル導体部（４２）は、第２主面（５２）側に設けられている。第１コイル導体部（４１）及び第２コイル導体部（４２）は、第１主面（５１）の平面視で、磁性体（５）と重なっている。第１コイル導体部（４１）は、第１主面（５１）の平面視で、第２コイル導体部（４２）と重なっていない。第１平面導体（６）は、コイル導体（４）と導通せず、かつ、第１主面（５１）の平面視で、コイル導体（４）と重なっている。第１平面導体（６）の少なくとも一部は、第１主面（５１）の平面視で、第１主面（５１）と対向するように磁性体（５）と重なっている。第１コイル導体部（４１）は、第１主面（５１）の平面視で、第１平面導体（６）と第２コイル導体部（４２）との間に位置する。 The antenna device (1) according to the first aspect includes a coil conductor (4), a magnetic material (5), and a first plane conductor (6). The coil conductor (4) has a first coil conductor portion (41) and a second coil conductor portion (42). The magnetic material (5) has a first main surface (51) and a second main surface (52). The first coil conductor portion (41) is provided on the first main surface (51) side. The second coil conductor portion (42) is provided on the second main surface (52) side. The first coil conductor portion (41) and the second coil conductor portion (42) overlap with the magnetic material (5) in a plan view of the first main surface (51). The first coil conductor portion (41) does not overlap with the second coil conductor portion (42) in a plan view of the first main surface (51). The first plane conductor (6) does not conduct with the coil conductor (4) and overlaps with the coil conductor (4) in the plan view of the first main surface (51). At least a part of the first plane conductor (6) overlaps the magnetic material (5) so as to face the first main surface (51) in the plan view of the first main surface (51). The first coil conductor portion (41) is located between the first plane conductor (6) and the second coil conductor portion (42) in a plan view of the first main surface (51).

第１の態様に係るアンテナ装置（１）によれば、コイル導体（４）の外側を通る磁束（φ３）の経路を第１平面導体（６）で変えて、コイル導体（４）の外側を通る磁束（φ３）が磁性体（５）を通ることを難しくすることができる。その結果、コイル開口（４４）を通る磁束（φ２）と、コイル導体（４）の外側を通る磁束（φ３）とが打ち消し合うことを低減できるので、相手側アンテナ装置（９）との通信可能エリアを広げることができる。 According to the antenna device (1) according to the first aspect, the path of the magnetic flux (φ3) passing through the outside of the coil conductor (4) is changed by the first plane conductor (6), and the outside of the coil conductor (4) is changed. It is possible to make it difficult for the passing magnetic flux (φ3) to pass through the magnetic material (5). As a result, it is possible to reduce the cancellation of the magnetic flux (φ2) passing through the coil opening (44) and the magnetic flux (φ3) passing through the outside of the coil conductor (4), so that communication with the other antenna device (9) is possible. The area can be expanded.

第２の態様に係るアンテナ装置（１）は、第１の態様において、第１平面導体（６）と異なる第２平面導体（７）を更に備える。第２平面導体（７）は、第２主面（５２）と対向する。第２平面導体（７）は、第１主面（５１）の平面視で、磁性体（５）と重なっており、かつ、コイル導体（４）で囲まれているコイル開口（４４）と重なっている。 The antenna device (1) according to the second aspect further includes a second plane conductor (7) different from the first plane conductor (6) in the first aspect. The second plane conductor (7) faces the second main surface (52). The second plane conductor (7) overlaps with the magnetic material (5) and overlaps with the coil opening (44) surrounded by the coil conductor (4) in the plan view of the first main surface (51). ing.

第２の態様に係るアンテナ装置（１）によれば、コイル開口（４４）を通る磁束（φ２）の経路を第２平面導体（７）で変えて、コイル開口（４４）を通る磁束（φ２）が、第２平面導体（７）を避けて磁性体（５）を通りやすくすることができる。 According to the antenna device (1) according to the second aspect, the path of the magnetic flux (φ2) passing through the coil opening (44) is changed by the second plane conductor (7), and the magnetic flux (φ2) passing through the coil opening (44) is changed. ) Can easily pass through the magnetic material (5) by avoiding the second plane conductor (7).

第３の態様に係るアンテナ装置（１）は、第１又は２の態様において、一の基材（３）を更に備える。基材（３）には、コイル導体（４）及び第１平面導体（６）が設けられている。 The antenna device (1) according to the third aspect further includes one base material (3) in the first or second aspect. The base material (3) is provided with a coil conductor (4) and a first plane conductor (6).

第３の態様に係るアンテナ装置（１）によれば、コイル導体（４）と第１平面導体（６）とを安価で一度に形成することができる。 According to the antenna device (1) according to the third aspect, the coil conductor (4) and the first plane conductor (6) can be formed at one time at low cost.

第４の態様に係るアンテナ装置（１）では、第１〜３の態様のいずれか１つにおいて、第１主面（５１）側が通信面である。 In the antenna device (1) according to the fourth aspect, in any one of the first to third aspects, the first main surface (51) side is the communication surface.

第５の態様に係る電子機器（８）は、アンテナ装置（１）と、筐体（８１）とを備える。筐体（８１）は、アンテナ装置（１）を収容する。アンテナ装置（１）は、コイル導体（４）と、磁性体（５）と、平面導体（第１平面導体６）とを備える。コイル導体（４）は、第１コイル導体部（４１）及び第２コイル導体部（４２）を有する。磁性体（５）は、第１主面（５１）及び第２主面（５２）を有する。第１コイル導体部（４１）は、第１主面（５１）側に設けられている。第２コイル導体部（４２）は、第２主面（５２）側に設けられている。第１コイル導体部（４１）及び第２コイル導体部（４２）は、第１主面（５１）の平面視で、磁性体（５）と重なっている。第１コイル導体部（４１）は、第１主面（５１）の平面視で、第２コイル導体部（４２）と重なっていない。平面導体は、コイル導体（４）と導通せず、かつ、第１主面（５１）の平面視で、コイル導体（４）と重なっていない。平面導体の少なくとも一部は、第１主面（５１）の平面視で、第１主面（５１）と対向するように磁性体（５）と重なっている。第１コイル導体部（４１）は、第１主面（５１）の平面視で、平面導体と第２コイル導体部（４２）との間に位置する。 The electronic device (8) according to the fifth aspect includes an antenna device (1) and a housing (81). The housing (81) houses the antenna device (1). The antenna device (1) includes a coil conductor (4), a magnetic material (5), and a flat conductor (first flat conductor 6). The coil conductor (4) has a first coil conductor portion (41) and a second coil conductor portion (42). The magnetic material (5) has a first main surface (51) and a second main surface (52). The first coil conductor portion (41) is provided on the first main surface (51) side. The second coil conductor portion (42) is provided on the second main surface (52) side. The first coil conductor portion (41) and the second coil conductor portion (42) overlap with the magnetic material (5) in a plan view of the first main surface (51). The first coil conductor portion (41) does not overlap with the second coil conductor portion (42) in a plan view of the first main surface (51). The flat conductor does not conduct with the coil conductor (4) and does not overlap with the coil conductor (4) in the plan view of the first main surface (51). At least a part of the planar conductor overlaps the magnetic material (5) so as to face the first main surface (51) in a plan view of the first main surface (51). The first coil conductor portion (41) is located between the planar conductor and the second coil conductor portion (42) in a plan view of the first main surface (51).

第５の態様に係る電子機器（８）によれば、コイル導体（４）の外側を通る磁束（φ３）の経路を平面導体（第１平面導体６）で変えて、コイル導体（４）の外側を通る磁束（φ３）が磁性体（５）を通ることを難しくすることができる。その結果、コイル開口（４４）を通る磁束（φ２）と、コイル導体（４）の外側を通る磁束（φ３）とが打ち消し合うことを低減できるので、相手側アンテナ装置（９）との通信可能エリアを広げることができる。 According to the electronic device (8) according to the fifth aspect, the path of the magnetic flux (φ3) passing through the outside of the coil conductor (4) is changed by the flat conductor (first flat conductor 6) to change the path of the coil conductor (4). It is possible to make it difficult for the magnetic flux (φ3) passing through the outside to pass through the magnetic material (5). As a result, it is possible to reduce the cancellation of the magnetic flux (φ2) passing through the coil opening (44) and the magnetic flux (φ3) passing through the outside of the coil conductor (4), so that communication with the other antenna device (9) is possible. The area can be expanded.

第６の態様に係る電子機器（８）では、第５の態様において、平面導体（第１平面導体６）は、磁性体（５）と筐体（８１）との間に位置する。 In the electronic device (8) according to the sixth aspect, in the fifth aspect, the planar conductor (first planar conductor 6) is located between the magnetic material (5) and the housing (81).

１アンテナ装置
３基材
４コイル導体
４１第１コイル導体部
４２第２コイル導体部
４４コイル開口
５磁性体
５１第１主面
５２第２主面
６第１平面導体（平面導体）
７第２平面導体
８電子機器
８１筐体 1 Antenna device 3 Base material 4 Coil conductor 41 1st coil conductor part 42 2nd coil conductor part 44 Coil opening 5 Magnetic material 51 1st main surface 52 2nd main surface 6 1st flat conductor (flat conductor)
7 Second flat conductor 8 Electronic equipment 81 Housing

Claims

A coil conductor having a first coil conductor portion and a second coil conductor portion,
A magnetic material having a first main surface and a second main surface,
With a first plane conductor,
The first coil conductor portion is provided on the first main surface side.
The second coil conductor portion is provided on the second main surface side.
The first coil conductor portion and the second coil conductor portion overlap with the magnetic material in a plan view of the first main surface.
The first coil conductor portion does not overlap with the second coil conductor portion in a plan view of the first main surface.
The first plane conductor does not conduct with the coil conductor and does not overlap with the coil conductor in the plan view of the first main surface.
At least a part of the first plane conductor overlaps the magnetic material so as to face the first main surface in a plan view of the first main surface.
The first coil conductor portion is located between the first plane conductor and the second coil conductor portion in a plan view of the first main surface.
Antenna device.

Further provided with a second plane conductor different from the first plane conductor,
The second plane conductor faces the second main surface and
The second plane conductor overlaps with the magnetic material and overlaps with the coil opening surrounded by the coil conductor in the plan view of the first main surface.
The antenna device according to claim 1.

Further comprising one substrate provided with the coil conductor and the first plane conductor.
The antenna device according to claim 1 or 2.

The first main surface side is the communication surface.
The antenna device according to any one of claims 1 to 3.

Antenna device and
A housing for accommodating the antenna device and
The antenna device is
A coil conductor having a first coil conductor portion and a second coil conductor portion,
A magnetic material having a first main surface and a second main surface,
With a flat conductor,
The first coil conductor portion is provided on the first main surface side.
The second coil conductor portion is provided on the second main surface side.
The first coil conductor portion and the second coil conductor portion overlap with the magnetic material in a plan view of the first main surface.
The first coil conductor portion does not overlap with the second coil conductor portion in a plan view of the first main surface.
The plane conductor does not conduct with the coil conductor and does not overlap with the coil conductor in the plan view of the first main surface.
At least a part of the planar conductor overlaps with the magnetic material so as to face the first main surface in a plan view of the first main surface.
The first coil conductor portion is located between the planar conductor and the second coil conductor portion in a plan view of the first main surface.
Electronics.

The flat conductor is located between the magnetic material and the housing.
The electronic device according to claim 5.