JP2016082359A - Antenna device - Google Patents

Antenna device Download PDF

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JP2016082359A
JP2016082359A JP2014211046A JP2014211046A JP2016082359A JP 2016082359 A JP2016082359 A JP 2016082359A JP 2014211046 A JP2014211046 A JP 2014211046A JP 2014211046 A JP2014211046 A JP 2014211046A JP 2016082359 A JP2016082359 A JP 2016082359A
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antenna element
electrode
antenna
case
antenna device
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祐次 角谷
Yuji Sumiya
祐次 角谷
齋藤　隆
Takashi Saito
隆 齋藤
達人 竹内
Tatsuto Takeuchi
達人 竹内
卓士 篠田
Takuji Shinoda
卓士 篠田
進吾 森藤
Shingo Morifuji
進吾 森藤
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Denso Corp
Soken Inc
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Denso Corp
Nippon Soken Inc
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Priority to JP2014211046A priority Critical patent/JP2016082359A/en
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Abstract

PROBLEM TO BE SOLVED: To provide a compact antenna having a high gain with high reliability.SOLUTION: Electrode parts 5, 6 are disposed between an antenna element 4 integrally disposed on the inner face side of a case 1 and a feeder circuit 3. The electrode part 5, 6 are of a planar shape, for example, and disposed in parallel with a gap. This causes to supply power from a feeder circuit 3 to the antenna element 4 in a non-contact manner. The electrode part 5, 6 may be of meander structure and a form having further an electrode part therebetween.SELECTED DRAWING: Figure 1

Description

本発明はアンテナ装置に関する。   The present invention relates to an antenna device.

従来よりアンテナ装置に関して各種提案がある。例えば下記特許文献１では、ケース内部に回路基板やアンテナエレメントを配置する形態において、それまでのようにアンテナエレメントをケース内部空間にホルダで保持するのではなく、ケース内壁にアンテナエレメントを一体に設ける構造が開示されている。この構造ではアンテナエレメントとケースの間に隙間が必要ないので、アンテナ利得に大きく関係するアンテナの高さが確保しやすくなる。よってケースの小型化とアンテナの高利得化とを従来より両立させやすくなる。   There have been various proposals regarding antenna devices. For example, in Patent Document 1 below, in a form in which a circuit board and an antenna element are arranged inside a case, the antenna element is not integrally held with a holder in the case internal space as before, but the antenna element is integrally provided on the inner wall of the case. A structure is disclosed. In this structure, since no gap is required between the antenna element and the case, the height of the antenna greatly related to the antenna gain is easily secured. Therefore, it becomes easier to achieve both a reduction in the size of the case and an increase in the gain of the antenna.

特開２００５−３１１６０７号公報Japanese Patent Laid-Open No. 2005-311607

特許文献１のアンテナ装置では、ケース天井面に一体化されたアンテナエレメントに電力を供給するために、アンテナエレメントを屈曲して下方へ延設させ、屈曲部分の弾性復元力により延設部の先端を給電点に圧接する構造としている。しかし本発明者の知見では、こうした構造では使用期間が長くなるにつれて弾性部分や接点部分が経年劣化することにより、アンテナ性能が低下するおそれがある。この点を改善すればさらに高い信頼性を有するアンテナ装置が実現できる。   In the antenna device of Patent Document 1, in order to supply power to the antenna element integrated with the case ceiling surface, the antenna element is bent and extended downward, and the distal end of the extended portion is caused by the elastic restoring force of the bent portion. Is pressed against the feeding point. However, according to the knowledge of the present inventor, in such a structure, there is a possibility that the antenna performance deteriorates due to deterioration of the elastic part and the contact part over time as the use period becomes longer. If this point is improved, an antenna device having higher reliability can be realized.

そこで本発明が解決しようとする課題は、上記に鑑み、小型化や高利得化を高信頼性と両立させたアンテナ装置を提供することにある。   Therefore, in view of the above, the problem to be solved by the present invention is to provide an antenna device in which miniaturization and high gain are compatible with high reliability.

上記課題を達成するために、本発明に係るアンテナ装置は、ケースと、そのケースと一体に設けられたアンテナエレメントと、前記ケース内に収容された回路基板上に配置された、前記アンテナエレメントに電力を供給するための電力供給回路と、その電力供給回路から前記アンテナエレメントへ非接触で電力を伝達する電力伝達部と、を備えたことを特徴とする。この発明によれば、ケースと一体に設けられたアンテナエレメントと電力供給回路との間を非接触構造とすることにより、従来のように弾性部分や接点部分の経年劣化によるアンテナ性能の低減が抑制できて、小型化や高利得化を高信頼性と両立させたアンテナ装置が実現される。   In order to achieve the above object, an antenna device according to the present invention includes a case, an antenna element provided integrally with the case, and the antenna element disposed on a circuit board accommodated in the case. A power supply circuit for supplying power and a power transmission unit that transmits power from the power supply circuit to the antenna element in a contactless manner are provided. According to the present invention, the non-contact structure between the antenna element provided integrally with the case and the power supply circuit prevents a reduction in antenna performance due to aging of the elastic portion and the contact portion as in the past. Thus, an antenna device in which downsizing and high gain are compatible with high reliability is realized.

また前記電力伝達部は、所定の面積を有する表面で対向する少なくとも２個以上の電極部からなる電気容量を備えたものとしてもよい。この発明によれば、ケースと一体に設けられたアンテナエレメントと電力供給回路との間に所定の面積を有する表面で対向する少なくとも２個以上の電極部を備えた非接触構造とすることにより、小型化や高利得化を高信頼性と両立させたアンテナ装置が実現される。   The power transmission unit may include an electric capacity including at least two electrode units facing each other on a surface having a predetermined area. According to the present invention, by providing a non-contact structure including at least two or more electrode portions facing each other on the surface having a predetermined area between the antenna element provided integrally with the case and the power supply circuit, An antenna device in which downsizing and high gain are compatible with high reliability is realized.

また前記電力伝達部の電気容量と、前記アンテナエレメントと前記回路基板の間の電気容量と、前記アンテナエレメントが有する電気誘導と、前記回路基板が有する電気容量と、が直列に接続された回路の共振周波数を動作周波数とするものとしてもよい。このようにアンテナの動作周波数を電極部の電気容量が関係する共振周波数と一致させるようにすれば、アンテナエレメントと電力供給回路の間の非接触構造で、高信頼性を実現しつつ、利得も最大化するように設計できる。   In addition, an electric capacity of the power transmission unit, an electric capacity between the antenna element and the circuit board, an electric induction of the antenna element, and an electric capacity of the circuit board are connected in series. The resonance frequency may be the operating frequency. In this way, by making the operating frequency of the antenna coincide with the resonance frequency related to the capacitance of the electrode section, a non-contact structure between the antenna element and the power supply circuit achieves high reliability and gain. Can be designed to maximize.

また前記アンテナエレメントの一端は開放であるものとしてもよい。この発明によれば、一端が開放であり、ケースと一体に設けられたアンテナエレメントと電力供給回路との間を非接触構造とすることにより、小型化や高利得化を高信頼性と両立させたアンテナ装置が実現される。   One end of the antenna element may be open. According to the present invention, one end is open, and a non-contact structure is provided between the antenna element provided integrally with the case and the power supply circuit, thereby achieving both downsizing and high gain with high reliability. An antenna device is realized.

また前記アンテナエレメントは逆Ｌ型モノポール構造であるものとしてもよい。この発明によれば、ケースと一体に設けられた逆Ｌ型モノポール構造のアンテナエレメントと電力供給回路との間を非接触構造とすることにより、小型化や高利得化を高信頼性と両立させたアンテナ装置が実現される。   The antenna element may have an inverted L-type monopole structure. According to the present invention, the non-contact structure is provided between the antenna element of the inverted L-type monopole structure provided integrally with the case and the power supply circuit, so that both miniaturization and high gain are compatible with high reliability. An antenna device is realized.

また２個以上の前記電極部は対向するメアンダ構造を有するものとしてもよい。この発明によればメアンダ構造の設計により電極部の電気容量の設計自由度があがるので、ケースの小型化などの条件のもとで共振周波数を動作周波数と一致させることがより容易となる。   Two or more electrode portions may have meander structures facing each other. According to the present invention, since the design of the meander structure increases the degree of freedom in designing the capacitance of the electrode portion, it becomes easier to match the resonance frequency with the operating frequency under conditions such as downsizing the case.

また前記電極部は、前記アンテナエレメントと導体を介して接続された第１電極部と、前記電力供給回路と導体を介して接続された第２電極部と、前記第１電極部と前記第２電極部との間に、前記第１電極部と前記第２電極部のいずれとも非接触で配置された第３電極部と、を備えたものとしてもよい。この発明によれば、第３電極部の設計により電極部の電気容量の設計自由度が上がるので、ケースの小型化などの条件のもとで共振周波数を動作周波数と一致させることがより容易となる。   The electrode unit includes a first electrode unit connected to the antenna element via a conductor, a second electrode unit connected to the power supply circuit via a conductor, the first electrode unit, and the second electrode unit. It is good also as what was provided with the 3rd electrode part arrange | positioned in non-contact with either the said 1st electrode part and the said 2nd electrode part between electrode parts. According to the present invention, the design flexibility of the electric capacity of the electrode portion is increased by the design of the third electrode portion, so that it is easier to match the resonance frequency with the operating frequency under conditions such as downsizing of the case. Become.

本発明のアンテナ装置の実施例１における構成図。The block diagram in Example 1 of the antenna apparatus of this invention. 実施例１のアンテナ装置の部分的構成を示す図。FIG. 3 is a diagram illustrating a partial configuration of the antenna device according to the first embodiment. 図１のＡ−Ａ断面図。AA sectional drawing of FIG. 図１のアンテナ装置の等価電気回路を示す図。The figure which shows the equivalent electrical circuit of the antenna apparatus of FIG. 図１のアンテナ装置の効果を示す図。The figure which shows the effect of the antenna apparatus of FIG. 本発明のアンテナ装置の実施例２における部分的構成を示す図。The figure which shows the partial structure in Example 2 of the antenna apparatus of this invention. 本発明のアンテナ装置の実施例３における部分的構成を示す図。The figure which shows the partial structure in Example 3 of the antenna apparatus of this invention. 本発明のアンテナ装置の実施例４における部分的構成を示す図。The figure which shows the partial structure in Example 4 of the antenna apparatus of this invention.

以下、本発明の実施形態を図面を参照しつつ説明する。図１は本発明のアンテナ装置の実施例１を示す斜視図であり、図２は図１でケース１を省略した図、図３は図１のＡ−Ａ断面図である。アンテナ装置１０は例えば車両のキーレスシステムでの車載側通信装置内で用いてもよいが、それには限定されずあらゆる用途に用いてよい。アンテナ装置１０はケース１、回路基板２、給電回路３、アンテナエレメント４、電極部５、６を備える。   Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing an antenna device according to a first embodiment of the present invention, FIG. 2 is a view in which the case 1 is omitted in FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA in FIG. The antenna device 10 may be used, for example, in an in-vehicle communication device in a vehicle keyless system, but is not limited thereto and may be used for any application. The antenna device 10 includes a case 1, a circuit board 2, a power feeding circuit 3, an antenna element 4, and electrode portions 5 and 6.

ケース１は図示下方の面が開口した筐体の上ケース１ａと平板形状の下ケース１ｂとからなる。図３に示す通り上ケース１ａの開口側に下ケース１ｂが一体化されてケース１となり、そのケース１の内部空間に回路基板２、給電回路３、アンテナエレメント４、電極部５、６が配置される。上ケース１ａと下ケース１ｂの一体化の方法は嵌合、ねじ締結、接着など任意の方法でよい。上ケース１ａ、下ケース１ｂは例えば樹脂材料などの誘電体で形成すればよい。   The case 1 is composed of an upper case 1a of a housing whose lower surface in the drawing is opened and a flat lower case 1b. As shown in FIG. 3, the lower case 1 b is integrated with the opening side of the upper case 1 a to form the case 1, and the circuit board 2, the feeding circuit 3, the antenna element 4, and the electrode parts 5 and 6 are arranged in the internal space of the case 1. Is done. The upper case 1a and the lower case 1b may be integrated by any method such as fitting, screw fastening, and adhesion. The upper case 1a and the lower case 1b may be formed of a dielectric material such as a resin material.

回路基板２は図１の例では主表面が長方形の板形状で、下ケース１ｂの図示上面側（内面側）に接合されている。給電回路３（電力供給回路）は回路基板２上に配置され、アンテナエレメント４に電磁波出力のための電力を供給する。   In the example of FIG. 1, the circuit board 2 has a rectangular plate shape and is joined to the upper surface side (inner surface side) of the lower case 1b. The power feeding circuit 3 (power supply circuit) is disposed on the circuit board 2 and supplies power for outputting electromagnetic waves to the antenna element 4.

アンテナエレメント４は導体により上ケース１ａの内面に、図１、図２に示すように逆Ｌ型モノポール構造、すなわち側面視で逆Ｌ形状で、複数個所で屈曲しつつ垂直方向と水平方向とに帯状（あるいは線状）に延びるように形成されており、端部は開放となっている。アンテナエレメント４の上ケース１ａの内面への一体化は例えば接着など適切な方法を用いればよい。   The antenna element 4 is formed on the inner surface of the upper case 1a by a conductor, and has an inverted L-type monopole structure as shown in FIGS. 1 and 2, that is, an inverted L shape in a side view, and is bent at a plurality of locations in a vertical direction and a horizontal direction. It is formed so as to extend in a strip shape (or linear shape), and the end portion is open. The antenna element 4 may be integrated with the inner surface of the upper case 1a by using an appropriate method such as adhesion.

本発明の主要部である電極部５、６（極板）は、それぞれ給電回路３とアンテナエレメント４に接続されるかたちで配置される。図１の例では電極部５、６ともに導体により、同形状、同面積の主表面を有する平板形状で形成されている。そして電極部５の主表面と電極部６の主表面とが間隔を置いて平行に対向するように配置されて、給電回路３と電極部５とが、そしてアンテナエレメント４と電極部６とが導体で接続されている。   The electrode parts 5 and 6 (electrode plates) which are the main parts of the present invention are arranged so as to be connected to the feeder circuit 3 and the antenna element 4, respectively. In the example of FIG. 1, the electrode portions 5 and 6 are both formed of a conductor and a flat plate shape having the same shape and the same main surface. The main surface of the electrode unit 5 and the main surface of the electrode unit 6 are arranged so as to face each other in parallel with a gap therebetween, so that the power feeding circuit 3 and the electrode unit 5 are connected, and the antenna element 4 and the electrode unit 6 are connected. Connected by conductor.

電極部５、６の存在により給電回路３からアンテナエレメント４へ非接触で（導体ではない部位を通って）電力が供給される。電極部５、６は主に電気容量（静電容量、コンデンサ、キャパシタンス）として機能する。よって、給電回路３とアンテナエレメント４とは電気容量を介して電気的に接続されることとなる。   Due to the presence of the electrode parts 5 and 6, electric power is supplied from the feeder circuit 3 to the antenna element 4 in a non-contact manner (through a portion that is not a conductor). The electrode parts 5 and 6 mainly function as electric capacity (electrostatic capacity, capacitor, capacitance). Therefore, the power feeding circuit 3 and the antenna element 4 are electrically connected via the electric capacity.

以上のようにアンテナ装置１０では、従来技術のようにアンテナエレメント４が給電回路３と導体によって接続されておらず、電極部５、６の箇所で非接触となっている（導体を介していない）。これに伴い、従来技術のように弾性復元力によってアンテナエレメント４と給電回路３とを接触させる形態も用いられていないので、当然弾性部分や接点部分の経年劣化によるアンテナ性能の低減も回避できる。したがって長期使用における高い信頼性を有するアンテナ装置となる。   As described above, in the antenna device 10, the antenna element 4 is not connected to the feeder circuit 3 and the conductor as in the prior art, and is not in contact with the electrode portions 5 and 6 (not via the conductor). ). Accordingly, the antenna element 4 and the feeding circuit 3 are not brought into contact with each other by the elastic restoring force as in the prior art, so that it is possible to avoid the reduction of the antenna performance due to the aging of the elastic portion and the contact portion. Therefore, the antenna device has high reliability in long-term use.

アンテナ装置１０の等価回路は図４のように示される。この等価回路で、Ｒ１とＬ１はそれぞれ給電回路３から電極部５までの部分が有する電気抵抗値（レジスタンス）と電気誘導値（インダクタンス）である。Ｃ１は電極部５、４間の電気容量値である。Ｒ２とＬ２はそれぞれアンテナエレメント４が有する電気抵抗値と電気誘導値である。Ｃ２はアンテナエレメント４と回路基板２の間の電気容量値である。   An equivalent circuit of the antenna device 10 is shown in FIG. In this equivalent circuit, R1 and L1 are an electric resistance value (resistance) and an electric induction value (inductance) which the part from the electric power feeding circuit 3 to the electrode part 5 has, respectively. C1 is an electric capacity value between the electrode portions 5 and 4. R2 and L2 are the electric resistance value and electric induction value of the antenna element 4, respectively. C2 is an electric capacitance value between the antenna element 4 and the circuit board 2.

この等価回路における共振周波数ｆｒ（インピーダンスが最小、利得が最大となる周波数）は、周知の計算法のわずかな変形により次式のように求められる。ここで「＾（１／２）」は（１／２）乗、すなわち平方根である。
ｆｒ＝１／［（２π）｛（Ｌ１＋Ｌ２）（Ｃ１＋Ｃ２）｝＾（１／２）］ The resonance frequency fr (frequency at which the impedance is minimum and the gain is maximum) in this equivalent circuit is obtained by the following equation by slight modification of a known calculation method. Here, "^ (1/2)" is the (1/2) th power, that is, the square root.
fr = 1 / [(2π) {(L1 + L2) (C1 + C2)} ^ (1/2)]

このｆｒをアンテナ装置１０の所定の動作周波数と一致させるように電極部５、６間の容量Ｃ１を設計すればよい。これによりアンテナ装置１０の利得が最大化される。電極部５、６間の容量Ｃ１の設計は、電極部５、６の対向する面の面積を大きくすることや、電極部５、６間の距離を小さくすることによってＣ１が大きくなる性質を用いればよい。   What is necessary is just to design the capacity | capacitance C1 between the electrode parts 5 and 6 so that this fr may correspond with the predetermined operating frequency of the antenna apparatus 10. FIG. This maximizes the gain of the antenna device 10. The design of the capacitance C1 between the electrode parts 5 and 6 uses the property that C1 increases by increasing the area of the opposing surfaces of the electrode parts 5 and 6 or decreasing the distance between the electrode parts 5 and 6. That's fine.

上記実施例のアンテナ装置１０と従来技術のアンテナ装置の利得を比較すると、図５に示された結果が得られた。図５に示された利得は、図１におけるアンテナ装置１０の中心を通る仮想的な鉛直軸まわりの全周方向の、動作周波数での利得である。ここでアンテナ装置１０において、例えばケース１の高さを３０ｍｍ、縦横寸法をともに５０ｍｍとし、電極部５、６の対向する主表面はともに高さ１２ｍｍ、横幅４０ｍｍ、電極部５、６間の距離は４ｍｍとした。アンテナ装置１０における電極部５、６間の容量Ｃ１は上記のように利得が最大となるように設定した。   When the gains of the antenna device 10 of the above embodiment and the antenna device of the prior art were compared, the result shown in FIG. 5 was obtained. The gain shown in FIG. 5 is the gain at the operating frequency in the entire circumference around the virtual vertical axis passing through the center of the antenna device 10 in FIG. Here, in the antenna device 10, for example, the height of the case 1 is 30 mm, the vertical and horizontal dimensions are both 50 mm, the opposing main surfaces of the electrode parts 5 and 6 are both 12 mm high, 40 mm wide, and the distance between the electrode parts 5 and 6. Was 4 mm. The capacitance C1 between the electrode portions 5 and 6 in the antenna device 10 was set so as to maximize the gain as described above.

また従来技術のアンテナ装置として、アンテナエレメントがケースと別体になっている形態のアンテナ装置を用いた。図５の結果を見ると、全周方向で本発明のアンテナ装置の利得の方が大きくなっている。平均利得では本発明の方が２ｄＢ高いとの結果が得られた。この結果は本発明が利得の面でも顕著な効果を生むことを示している。   Moreover, the antenna apparatus of the form from which the antenna element became a different body from a case was used as a prior art antenna apparatus. Looking at the result of FIG. 5, the gain of the antenna device of the present invention is larger in the entire circumferential direction. The average gain was 2 dB higher in the present invention. This result shows that the present invention produces a remarkable effect in terms of gain.

本発明は上記の実施例には限定されない。図６から図８には別の実施例が示されている。なお図６ではケース１の図示を省略しており、図７、図８では電極部の部分のみを拡大して示している。図６に示された実施例２のアンテナ装置では、給電回路３と導体で接続された電極部５’と、アンテナエレメント４と導体で接続された電極部６’との間で対向する面が図示水平方向になるように配置している。これに伴い、電極部５’の上の板状の樹脂基板７を載置し、その上に電極部６’を載置する構成とした。これにより電極部６’が安定して配置される。   The present invention is not limited to the above embodiments. Another embodiment is shown in FIGS. In FIG. 6, the case 1 is not shown, and only the electrode portion is shown in an enlarged manner in FIGS. In the antenna device according to the second embodiment shown in FIG. 6, an opposing surface is provided between the electrode portion 5 ′ connected to the feeder circuit 3 with a conductor and the electrode portion 6 ′ connected to the antenna element 4 with a conductor. It arrange | positions so that it may become the illustration horizontal direction. Accordingly, the plate-shaped resin substrate 7 is placed on the electrode portion 5 ', and the electrode portion 6' is placed thereon. Thereby, the electrode part 6 'is stably arranged.

また図６のような電極部５’、６’の配置は、ケース１の高さを小さくしたい場合にも好適である。樹脂基板７は樹脂に限らず誘電体であればよい。周知のとおり樹脂（誘電体）の選択により電極部５’、６’の間の容量値が影響を受ける。したがって所望の容量値となるように電極部５’、６’間の樹脂（誘電体）を選択すればよい。もちろん樹脂（誘電体）は、図１の電極部５、６間や図７の電極部５”、６”間など別の実施形態内で配置してもよい。   The arrangement of the electrode portions 5 ′ and 6 ′ as shown in FIG. 6 is also suitable when it is desired to reduce the height of the case 1. The resin substrate 7 is not limited to resin and may be a dielectric. As is well known, the capacitance value between the electrode portions 5 'and 6' is affected by the selection of the resin (dielectric). Therefore, the resin (dielectric) between the electrode portions 5 'and 6' may be selected so as to obtain a desired capacitance value. Of course, the resin (dielectric material) may be disposed in another embodiment such as between the electrode portions 5 and 6 in FIG. 1 and between the electrode portions 5 ″ and 6 ″ in FIG.

図７に示された実施例３のアンテナ装置では、電極部をいわゆるメアンダ構造としている。すなわち電極部５”、６”は２枚の平行な板形状が側方視で蛇行するように屈曲した形状を有する。この構造であれば、電極部の大きさをコンパクトにしたまま、それらの間の対向する面の面積を大きくすることができる。したがって電極部間の容量値の設計の自由度が向上する。図７の電極部５”、６”を例えば図１の電極部５、６や図７の電極部５’、６’に置き換えて用いればよい。   In the antenna device of Example 3 shown in FIG. 7, the electrode portion has a so-called meander structure. That is, the electrode portions 5 ″ and 6 ″ have a shape that is bent so that two parallel plate shapes meander in a side view. If it is this structure, the area of the surface which opposes between them can be enlarged, keeping the magnitude | size of an electrode part compact. Therefore, the degree of freedom in designing the capacitance value between the electrode portions is improved. 7 may be used in place of, for example, the electrode parts 5 and 6 in FIG. 1 and the electrode parts 5 'and 6' in FIG.

図８に示された実施例４のアンテナ装置では、図１、図２と同様の電極部５、６の間に３枚目の電極部８が配置されている。図８の例では、電極部８は電極部５、６と主表面が同形状、同面積の板形状とされて、電極部５、６と平行に（非接触で）配置されている。このように電極部８を配置した形態により、電極部５、６間の容量値の設計の自由度が向上する。電極部８は図８の例では１枚だが、枚数には限定がなく、２枚、３枚など任意の枚数でよい。また（１枚や複数枚の）電極部８は、図６や図７など他の実施形態で用いてもよい。   In the antenna device of the fourth embodiment shown in FIG. 8, the third electrode portion 8 is disposed between the electrode portions 5 and 6 similar to those in FIGS. In the example of FIG. 8, the electrode portion 8 has a plate shape having the same shape and the same surface as the electrode portions 5 and 6, and is arranged in parallel (non-contact) with the electrode portions 5 and 6. With the configuration in which the electrode portion 8 is arranged in this manner, the degree of freedom in designing the capacitance value between the electrode portions 5 and 6 is improved. Although the number of electrode portions 8 is one in the example of FIG. 8, the number of electrodes is not limited and may be any number such as two or three. Moreover, you may use the electrode part 8 (one sheet or several sheets) in other embodiment, such as FIG.6 and FIG.7.

上記実施形態は特許請求の範囲に記載された趣旨の範囲内で適宜変更してよい。例えば上記実施例ではアンテナエレメント４を逆Ｌ型モノポール構造としたが、本発明はこれに限定されず、給電回路３からの電力供給が非接触で行われさえすれば、逆Ｆ型など他の任意の構造でもよい。またケース１の構造も図３に示した構造には限定されず、例えば３つ以上の部分が一体化した構造でもよい。   The above embodiment may be appropriately changed within the scope of the spirit described in the claims. For example, in the above embodiment, the antenna element 4 has an inverted L-type monopole structure. However, the present invention is not limited to this, and as long as the power supply from the power supply circuit 3 is performed in a non-contact manner, the inverted F type or the like is used. Any structure may be used. Further, the structure of the case 1 is not limited to the structure shown in FIG. 3, and may be a structure in which, for example, three or more parts are integrated.

３ 給電回路（電力供給回路）
４ アンテナエレメント
５ 電極部（電力伝達部）
６ 電極部（電力伝達部） 3 Power supply circuit (power supply circuit)
4 Antenna element 5 Electrode part (Power transmission part)
6 Electrode part (power transmission part)

Claims (7)

ケースと、
そのケースに一体に設けられたアンテナエレメントと、
前記ケース内に収容された回路基板上に配置された、前記アンテナエレメントに電力を供給するための電力供給回路と、
その電力供給回路から前記アンテナエレメントへ非接触で電力を伝達する電力伝達部と、
を備えたことを特徴とするアンテナ装置。 Case and
An antenna element provided integrally with the case;
A power supply circuit arranged on a circuit board housed in the case for supplying power to the antenna element;
A power transmission unit that transmits power from the power supply circuit to the antenna element in a contactless manner;
An antenna device comprising: 前記電力伝達部は、所定の面積を有する表面で対向する少なくとも２個以上の電極部からなる電気容量を備えた請求項１に記載のアンテナ装置。   The antenna device according to claim 1, wherein the power transmission unit includes an electric capacitance including at least two electrode portions facing each other on a surface having a predetermined area. 前記電力伝達部の電気容量と、前記アンテナエレメントと前記回路基板の間の電気容量と、前記アンテナエレメントが有する電気誘導と、前記回路基板が有する電気容量と、が直列に接続された回路の共振周波数を動作周波数とする請求項２に記載のアンテナ装置。   Resonance of a circuit in which the electric capacity of the power transmission unit, the electric capacity between the antenna element and the circuit board, the electric induction of the antenna element, and the electric capacity of the circuit board are connected in series The antenna device according to claim 2, wherein the frequency is an operating frequency. 前記アンテナエレメントの一端は開放である請求項１乃至３のいずれか１項に記載のアンテナ装置。   The antenna device according to any one of claims 1 to 3, wherein one end of the antenna element is open. 前記アンテナエレメントは逆Ｌ型モノポール構造である請求項１乃至４のいずれか１項に記載のアンテナ装置。   The antenna apparatus according to claim 1, wherein the antenna element has an inverted L-type monopole structure. ２個以上の前記電極部は対向するメアンダ構造を有する請求項２に記載のアンテナ装置。   The antenna device according to claim 2, wherein the two or more electrode portions have meander structures facing each other. 前記電極部は、
前記アンテナエレメントと導体を介して接続された第１電極部と、
前記電力供給回路と導体を介して接続された第２電極部と、
前記第１電極部と前記第２電極部との間に、前記第１電極部と前記第２電極部のいずれとも非接触で配置された第３電極部と、
を備えた請求項２に記載のアンテナ装置。 The electrode part is
A first electrode connected to the antenna element via a conductor;
A second electrode portion connected to the power supply circuit via a conductor;
A third electrode part disposed between the first electrode part and the second electrode part in a non-contact manner with either the first electrode part or the second electrode part;
The antenna device according to claim 2, comprising:
JP2014211046A 2014-10-15 2014-10-15 Antenna device Pending JP2016082359A (en)

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Publications (1)

Publication Number Publication Date
JP2016082359A true JP2016082359A (en) 2016-05-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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