JP2004104678A

JP2004104678A - Antenna device

Info

Publication number: JP2004104678A
Application number: JP2002266899A
Authority: JP
Inventors: Susumu Fukushima; 福島　奨
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2002-09-12
Filing date: 2002-09-12
Publication date: 2004-04-02

Abstract

【課題】移動体通信等の無線機に使用されるダイバーシティ方式のアンテナ装置に関して、アイソレーションの取れた２つ以上の給電ポートを１つのアンテナに設けることにより、２本以上のアンテナを１本のアンテナにて実現し、小型で低コストなダイバーシティ方式のアンテナ装置を実現することを目的とする。
【解決手段】グランド板２に対向して設けられた電気長が概ね１／２波長の直径を有する円状の放射板１が、その周辺部に第１の給電ポート３と第２の給電ポート４を有しており、それらの給電ポートは各給電ポートと放射板１の中点が直交する位置に設けられ、さらに、放射板１の周辺部から概ね１／８波長の領域における放射板１とグランド板２の間には第１の基体５が充填され、それ以外の領域には第２の基体６が充填され、第１の基体５の比透磁率を比誘電率で割った値は第２の基体６の比透磁率を比誘電率で割った値より小さくなるように基体の選択がなされる。
【選択図】　図２An antenna device of a diversity system used for a radio device for mobile communication or the like is provided with two or more isolated power supply ports in one antenna, thereby connecting two or more antennas to one antenna. An object of the present invention is to realize a small and low-cost diversity antenna device realized by an antenna.
A circular radiating plate (1) having an electrical length of approximately 波長 wavelength and provided in opposition to a ground plate (2) has a first power supply port (3) and a second power supply port in the periphery thereof. The power supply ports are provided at positions where the midpoints of the power supply ports and the radiation plate 1 are orthogonal to each other, and furthermore, the radiation plates 1 in a region of approximately ８ wavelength from the periphery of the radiation plate 1 are provided. The space between the first base 5 and the ground plate 2 is filled with the first base 5, and the other region is filled with the second base 6, and the value obtained by dividing the relative magnetic permeability of the first base 5 by the relative permittivity is as follows. The base is selected so as to be smaller than the value obtained by dividing the relative magnetic permeability of the second base 6 by the relative permittivity.
[Selection] Fig. 2

Description

【０００１】
【発明の属する技術分野】
本発明は主として移動体通信等に使用されるアンテナ装置に関するものである。
【０００２】
【従来の技術】
複数の情報通信システムが使用可能な通信モジュールを図１３に示す。図１３の通信モジュール１００は、アンテナ１０１を備えたＢｌｕｅｔｏｏｔｈシステム１０３とアンテナ１０２を備えたＷ−ＬＡＮシステム１０４の両方のシステムが使用可能なものである。このような通信モジュール１００を設計する上で注意しなければならない点は、両システム１０３，１０４ともに２．４ＧＨｚ帯を使用している点と両システム１０３，１０４が同時に使用される点である。つまり、一方のシステムが送信している時に他方のシステムが受信状態であることも考えられ、この場合、一方のシステムの信号が他方のシステムにおいて妨害ノイズとなり、ＢＥＲ（Ｂｉｔ　Ｅｒｒｏｒ　Ｒａｔｅ：ビット誤り率）の著しい劣化を引き起こすこともありうる。
【０００３】
これを防ぐため、従来は、アンテナを２つ用意したり、２周波共用アンテナを用意し、図１３の通信モジュール１００においては、各システム１０３，１０４にそれぞれアンテナ１０１，１０２を具備させることにより両システム間の信号の飛込みを防止している。
【０００４】
なお、この出願の発明に関連する先行技術文献情報としては、例えば、特許文献１、特許文献２が知られている。
【０００５】
【特許文献１】
特許第３１１４５８２号公報
【特許文献２】
特開２００１−１７７３３０号公報
【０００６】
【発明が解決しようとする課題】
しかしながら上記の構成では、２つのアンテナ１０１，１０２を物理的に離して配置する必要があるため、通信モジュール１００が搭載される筐体のサイズは必然的に大きくなってしまう。また、アンテナ１０１，１０２を２本使用することより、アンテナ搭載位置を２箇所確保する必要があるとともに、アンテナ１０１，１０２の製造コストも２倍必要となる。
【０００７】
これらの課題を克服するために、本発明はこれまで２本必要であったアンテナを１つのアンテナにて実現するものであり、１つのアンテナに２つ以上の給電ポートを設け、各ポート間のアイソレーションが取れる構成の具現化を図ったアンテナ装置を提供することを目的としている。
【０００８】
【課題を解決するための手段】
本発明のアンテナ装置は、２つ以上の給電ポートを設けるとともに、各給電ポートをそれ以外の給電ポートより給電された時に放射板上で常に零電位となる領域に設置されたことを特徴としている。このような位置に各給電ポートを配置することにより、各給電ポート位置での電位が他の給電ポートからの高周波信号により時間的に変動させられないため、他の給電ポートからの高周波信号の漏れ込みを低減することができ、このようなアンテナ装置を用いることにより、２本必要であったアンテナを１本にて具現化できるためコスト削減を図ることができるとともに、筐体に必要であったアンテナ設置スペースを半減させることができ、筐体の小型化を実現することが可能となる。
【０００９】
【発明の実施の形態】
本発明の請求項１に記載の発明は、グランド板とこのグランド板に対向して配置した放射板と、この放射板の形状が放射板の中点に対して点対称であるとともに、複数の給電ポートが放射板の任意の位置で放射板上に発生する電位零の領域に設けられ、放射板とグランド板の間に誘電体または磁性体または誘電体と磁性体の混合体から構成される基体が充填され、各給電ポートと放射板の中点を結ぶ直線上において放射板の端部と放射板の中点の間の任意点において前記基体の比透磁率を比誘電率で割った値が変化し、前記直線上における放射板の端部に近い領域の前記基体の比透磁率を比誘電率で割った値に比べて放射板の中点に近い領域の前記基体の比透磁率を比誘電率で割った値が大きく、この基体が放射板の中点に対して点対称となるように構成したアンテナ装置であり、給電ポート間のアイソレーションが確保できるとともに、放射板とグランド板を共振器として考えた時に、放射板とグランド板の間の基体の材質をその途中において変更することによりＳＩＲ構造（Ｓｔｅｐｐｅｄ　Ｉｍｐｅｄａｎｃｅ　Ｒｅｓｏｎａｔｏｒ）とすることができ、共振器長を短くすることが可能となるため、結果として、アンテナ装置の小型化を図ることが可能となる。
【００１０】
本発明の請求項２に記載の発明は、グランド板と、このグランド板に対向して配置した放射板と、複数の給電ポートが放射板の任意の位置で放射板上に発生する電位零の領域に設けられ、その放射板の形状が各給電ポートと放射板を結ぶ直線に対し線対称となるとともに、放射板とグランド板の間に誘電体または磁性体または誘電体と磁性体の混合体から構成される基体が充填され、各給電ポートと放射板の中点を結ぶ直線上において放射板の端部と放射板の中点の間の任意点において前記基体の比透磁率を比誘電率で割った値が変化し、前記直線上における放射板の端部に近い領域の前記基体の比透磁率を比誘電率で割った値に比べて放射板の中点に近い領域の前記基体の比透磁率を比誘電率で割った値が大きく、この基体が各給電ポートと放射板の中点を結ぶ直線に対して線対称となるように構成したアンテナ装置であり、各給電ポートにおける放射板の共振周波数を異ならせることができるとともに、給電ポート間のアイソレーションが確保でき、また、放射板とグランド板の間の基体の材質をその途中において変更することによりＳＩＲ構造とすることができ、アンテナ装置の小型化を図ることが可能となる。
【００１１】
本発明の請求項３に記載の発明は、請求項１に記載の発明において、直径が電気長で概ね１／２波長の円形状の放射板または各給電ポートと放射板の中点を結ぶ直線上における一方の放射板の端部から他方の放射板の端部までの電気長が概ね１／２波長の正多角形状の放射板により構成されたアンテナ装置であり、小型形状であるとともに１つのアンテナ装置において給電ポート間のアイソレーションが確保された２つの給電ポートが具現化できる。
【００１２】
本発明の請求項４に記載の発明は、請求項２に記載の発明において、長軸および短軸のそれぞれの電気長が概ね所望周波数の１／２波長となる楕円形状の放射板または各給電ポートと放射板の中点を結ぶ直線上における一方の放射板の端部から他方の放射板の端部までの電気長が概ね１／２波長の正多角形以外の方形状の放射板により構成された請求項２に記載のアンテナ装置であり、１つのアンテナ装置においてアイソレーションが確保された共振周波数の異なる２つの給電ポート間を具現化することができる。
【００１３】
本発明の請求項５に記載の発明は、請求項３または請求項４に記載の発明において、各給電ポートと放射板の中点を結ぶ直線上において、放射板の端部より電気長で概ね１／８波長の位置でグランド板と放射板の間の基体の比透磁率を比誘電率で割った値が大きくなるようにしたアンテナ装置であり、１／４波長共振器を最も短く設計したい場合の共振器形状である共振器の中点（端部より１／８波長の点）において特性インピーダンスを大きく変化させた形状をアンテナ装置に適用することにより、アンテナ装置の小型化を図ることが可能となる。
【００１４】
本発明の請求項６に記載の発明は、請求項１に記載の発明において、直径が電気長で概ね［１＋０．５×ｎ（ｎは０以上の整数）］波長の円形状の放射板または各給電ポートと放射板の中点を結ぶ直線上における一方の放射板の端部から他方の放射板の端部までの電気長が概ね［１＋０．５×ｎ（ｎは０以上の整数）］波長の正多角形状の放射板により構成されたアンテナ装置であり、１つのアンテナ装置において給電ポート間のアイソレーションが確保された３つの給電ポートを具現化することができる。
【００１５】
本発明の請求項７に記載の発明は、請求項２に記載の発明において、長軸および短軸のそれぞれの電気長が概ね所望周波数の［１＋０．５×ｎ（ｎは０以上の整数）］波長となる楕円形状の放射板または各給電ポートと放射板の中点を結ぶ直線上における一方の放射板の端部から他方の放射板の端部までの電気長が概ね［１＋０．５×ｎ（ｎは０以上の整数）］波長の正多角形以外の方形状の放射板により構成されたアンテナ装置であり、放射板の形状を大きくすることにより、放射利得の向上を図ることができる。
【００１６】
本発明の請求項８に記載の発明は、請求項６または請求項７に記載の発明において、各給電ポートと放射板の中点を結ぶ直線上において、放射板の端部から電気長で概ね４×ｎ／８（ｎは０以上の整数）波長の位置から（１＋４×ｎ）／８（ｎは０以上の整数）までの領域の基体の比透磁率を比誘電率で割った値がそれ以外の領域の基体の比透磁率を比誘電率で割った値よりも小さくなるようにしたアンテナ装置であり、１／４波長共振器を最も短く設計したい場合の共振器形状である共振器の中点（端部より１／８波長の点）において特性インピーダンスを大きく変化させた形状を連続的につなぎ合わせた形状をアンテナ装置に適用することにより、アンテナ装置の小型化を図ることが可能となる。
【００１７】
本発明の請求項９に記載の発明は、請求項１または請求項２に記載の発明において、放射板に第１の給電ポートおよび第２の給電ポートが設けられ、それぞれの給電ポート位置と放射板の中点とを結ぶ直線が相互に直交したアンテナ装置であり、第１の給電ポートに給電した場合、第１の給電ポートと放射板の中点を結ぶ直線に対し、放射板の中点において直交する直線上において電位が０となり、第２の給電ポートに給電した場合も同様の現象が発生することから、それぞれの給電ポート位置と放射板の中点とを結ぶ直線が相互に直交するように各給電ポートを設置することにより、給電ポート間のアイソレーションを確保することが可能となる。
【００１８】
本発明の請求項１０に記載の発明は、請求項７に記載の発明において、放射板に第１の給電ポートおよび第２の給電ポートおよび第３の給電ポートが設けられ、それぞれの給電ポート位置と放射板の中点とを結ぶ直線が相互に６０度の角度をもって交差するアンテナ装置であり、このような給電ポートの位置関係においてのみ、放射板の周辺部に相互にアイソレーションの確保できた給電ポートを３つ設けることが可能となる。
【００１９】
本発明の請求項１１に記載の発明は、請求項１および請求項２に記載の発明において、給電ポートを放射板の端部に設けたアンテナ装置であり、アンテナ装置の製造上、また基板への実装を考慮した場合においても、放射板の外周部へ給電ポートを設けた方が容易となる。
【００２０】
本発明の請求項１２に記載の発明は、請求項１または請求項２に記載の発明において、放射板の端部の任意点と放射板の中点を結ぶ直線上に給電ポートを設けたアンテナ装置装置であり、給電部を放射板の周辺部より内側へ設けることにより、各給電ポートの整合を取ることが可能となる。
【００２１】
本発明の請求項１３に記載の発明は、請求項１または請求項２に記載の発明において、給電ポートがギャップを介して放射板と接続されたアンテナ装置であり、ギャップの間隔を調整することにより整合回路を使用せずにアンテナ装置の整合を取ることができ、整合回路に要するコスト、実装スペースの削減が可能となる。
【００２２】
本発明の請求項１４に記載の発明は、請求項１３に記載の発明において、ギャップに面した部分の給電ポートと放射板の形状がインターディジタル構造としたアンテナ装置であり、ギャップに発生する容量値を大きくすることが可能となることから、インピーダンス整合の調整範囲を広げることが可能となる。
【００２３】
本発明の請求項１５に記載の発明は、請求項１または請求項２に記載の発明において、放射板の中点に給電ポートを設けたアンテナ装置であり、各給電ポートを給電した場合でも放射板の中点においては常に電位が零となることより、放射板の中点に任意のインピーダンス素子を付加しても各給電ポートへの影響が無いことから、放射板の中点に新たな給電ポートを設けることが可能となる。
【００２４】
本発明の請求項１６に記載の発明は、請求項１または請求項２に記載の発明において、放射板の中点に設けられた給電ポートにおける放射板の共振周波数がその他の給電ポートにおける共振周波数と異なるように構成したアンテナ装置であり、放射板の中央部の給電ポートとその他の給電ポートの間のアイソレーション値を大きくすることができる。
【００２５】
本発明の請求項１７に記載の発明は、請求項１または請求項２に記載の発明において、給電ポートと放射板の中点を結ぶ直線上において、放射板の端部から放射板の中点までの間で放射板とグランド板の間隔が変化し、放射板の端部に比べ放射板の中点の放射板とグランド板の間隔を広くしたアンテナ装置であり、放射板とグランド板を共振器として考えた時に、放射板とグランド板の間隔をその途中において変更することにより共振器構造をＳＩＲ構造（Ｓｔｅｐｐｅｄ　Ｉｍｐｅｄａｎｃｅ　Ｒｅｓｏｎａｔｏｒ）とすることができ、共振器長を短くすることが可能となるため、結果として、アンテナ装置の小型化を図ることが可能となる。
【００２６】
本発明の請求項１８に記載の発明は、請求項１７に記載の発明において、給電ポートと放射板の中点を結ぶ直線上において、放射板の端部から電気長で概ね１／８波長の点において放射板とグランド板の間隔を広くしたアンテナ装置であり、１／４波長共振器を最も短く設計したい場合の共振器形状である共振器の中点（端部より１／８波長の点）において特性インピーダンスを大きく変化させた形状をアンテナ装置に適用することにより、アンテナ装置の小型化を図ることが可能となる。
【００２７】
本発明の請求項１９に記載の発明は、請求項１または請求項２に記載の発明において、給電ポートと放射板の中点を結ぶ直線上において、放射板の断面が凸部形状のつながりで構成され、放射板の周辺部を凸部形状の谷部としたアンテナ装置であり、給電ポートと放射板の中点を結ぶ直線上における一方の放射板の端部から他方の放射板の端部までの電気長が概ね１／２波長以上の放射板を用いることにより、高い放射利得と広帯域特性を実現することができる。
【００２８】
本発明の請求項２０に記載の発明は、請求項１８に記載の発明について、放射板の断面形状が電気長で概ね１／２波長の凸部形状のつながりで構成されたアンテナ装置であり、最も小型化することが可能な短絡端から１／８波長の点で特性インピーダンスが変化するＳＩＲ構成の１／４波長の共振器を短絡端において相互につなげた１／２波長の共振器をアンテナ装置に適用したものであり、小型化を図ることができる。
【００２９】
本発明の請求項２１に記載の発明は、請求項１または請求項２に記載の発明において、給電ポートと放射板の中点を結ぶ直線上において、グランド板の断面が凹部形状のつながりで構成され、放射板の周辺部に対向するグランド板部分が凹部形状の山部となるアンテナ装置であり、放射板とグランド板を共振器として考えた時に、放射板とグランド板の間隔をその途中において変更することにより共振器構造をＳＩＲ構造とすることができ、共振器長を短くすることが可能となるため、結果として、アンテナ装置の小型化を図ることが可能となる。
【００３０】
本発明の請求項２２に記載の発明は、請求項２１に記載の発明において、放射板の断面形状が電気長で概ね１／２波長の凹部形状のつながりで構成されたアンテナ装置であり、１／４波長共振器を最も短く設計したい場合の共振器形状である共振器の中点（端部より１／８波長の点）において特性インピーダンスを大きく変化させた形状をアンテナ装置に適用することにより、アンテナ装置の小型化を図ることが可能となる。
【００３１】
本発明の請求項２３に記載の発明は、請求項１または請求項２に記載の発明において、給電ポートと放射板の中点を結んだ線分に対して線対称となる放射板の周辺部の任意位置に任意の数のスリットを設けたアンテナ装置であり、スリットにより放射板の電気長を等価的に長く設定することが可能となり、結果として、アンテナ装置の小型化を実現することが可能となる。
【００３２】
本発明の請求項２４に記載の発明は、請求項１または請求項２に記載の発明において、給電ポートを導電線路にて構成するとともに、導電線路をグランド板に対して任意の角度をもって形成したアンテナ装置であり、すべての給電ポートをグランド板に対して垂直に立ち上がった導電線路にて構成した場合に、給電ポート間において結合が発生する可能性があるため、これを防止するために各給電ポートを平行に設置せず、各給電ポート間のアイソレーションを高く設計することが可能なアンテナ装置を具現化できる。
【００３３】
本発明の請求項２５に記載の発明は、請求項１または請求項２に記載の発明において、略円状の放射板の中点または略正多角形の放射板の対角線の交点を基準としたときの給電ポートの位置に対して対称となる位置に先端が開放状態のリアクタンス素子またはその開放端がグランド板に電気的に接続されたリアクタンス素子を付加したアンテナ装置であり、導電性エレメントによりアンテナ装置の電気長が等価的に長く設計できるため、結果として、アンテナ装置の小型化を図ることが可能となる。
【００３４】
本発明の請求項２６に記載の発明は、請求項２５に記載の発明において、先端が開放状態のリアクタンス素子の先端部を切断することにより、ポート間のアイソレーションを調整したアンテナ装置であり、アンテナ装置を実装する筐体により変化するアンテナ装置の特性を先端が開放状態の導電性エレメントの長さを調節することにより調整できるため、さまざまな筐体に迅速に対応可能となる。
【００３５】
本発明の請求項２７に記載の発明は、請求項１または請求項２に記載の発明において、各給電ポートをダイバーシティ方式の通信に使用するアンテナ装置であり、ダイバーシティ方式の通信に使用されるアンテナの本数を２本から１本へ減らすことができるため、低コストで小型なダイバーシティ方式のアンテナ装置を実現することが可能となる。
【００３６】
本発明の請求項２８に記載の発明は、請求項１または請求項２に記載の発明において、各給電ポートを異なるシステムの通信に使用するアンテナ装置であり、各ポート間のアイソレーションが確保されていることからアンテナ直下にシステムごとの信号を分波する共用器を用意する必要がなく、共用器に必要となるコスト、実装スペースの削減が可能となるとともに、Ｗ−ＬＡＮとＢｌｕｅｔｏｏｔｈを同時に使用する携帯端末に対しては、両システムが同一周波数を使用していることよりフィルタ共用器では両システム信号を分けることが不可能であるため、アンテナ自体を２つ用意し、両アンテナ間のアイソレーションを確保するために両アンテナを一定間隔離して使用する必要が出てくるが、本発明のアンテナ装置を使用すれば、１つのアンテナ装置により具現化可能となるため、アンテナに必要となるコストが低減でき、また端末の小型化を実現することもできる。
【００３７】
本発明の請求項２９に記載の発明は、請求項１または請求項２に記載の発明において、第１の給電ポートを第１のシステムの通信に使用し、第２の給電ポートと第３の給電ポートを第２のシステムのダイバーシティ方式の通信に使用するアンテナ装置であり、ダイバーシティアンテナと共用器を一体化することが可能であり、携帯端末の小型化を実現することができる。
【００３８】
本発明の請求項３０に記載の発明は、請求項１または請求項２に記載のアンテナ装置であり、第１の給電ポートを第１のシステムの通信に使用し、第２の給電ポートと第３の給電ポートを第２のシステムの送信用、受信用として使用するアンテナ装置であり、システムごとの信号を分波する共用器と送信、受信信号を分波する共用器を一体化することが可能であり、マルチファンクション対応の携帯端末の小型化を実現することが可能である。
【００３９】
（実施の形態１）
図１（ａ）および図１（ｂ）は本発明の第１の実施の形態によるアンテナ装置であり、図１（ａ）のアンテナ装置は、グランド板２に対向して配設された放射板１の周辺部に第１の給電ポート３と第２の給電ポート４を設けた複数給電ポートを有するアンテナ装置であり、放射板１とグランド板２の間には第１の基体５と第２の基体６を有している。そして各給電ポート３，４の位置と放射板１の中点を結ぶ線分の途中において第１の基体５から第２の基体６へと基体が変更される構成となっているとともに、第１の基体５の比透磁率を比誘電率で割った値は第２の基体６の比透磁率を比誘電率で割った値よりも小さくなるように基材を選択している。
【００４０】
図１（ａ）に示した２つの給電ポート３，４を有したアンテナ装置の放射板１のサイズと各給電ポート３，４の配設位置を図１（ｂ）に示す。放射板１の形状は直径が所望の周波数の１／２波長（電気長）となる円状であり、第１の給電ポート３および第２の給電ポート４が放射板１の周辺部に設けられる構成となっている。
【００４１】
第１の給電ポート３のみに所望の周波数の信号を入力した場合、放射板１とグランド板２が第１の給電ポート３と放射板１の中点を結んだ直線上における端部開放１／２波長共振器として動作し、第１の共振電流７が放射板１上に流れることとなる。また、端部開放１／２波長共振器の中点において、電位は零となる。つまり、放射板１上の第１の線分９上において、常に電位が零となる。この電位零となる第１の線分９上に第２の給電ポート４が位置するために、第１の給電ポート３より入力された所望周波数の高周波信号は第２の給電ポート４に漏れることは無い。
【００４２】
これと同様の原理で、第２の給電ポート４のみに所望の周波数の信号を入力した場合、第２の共振電流８が放射板１上に流れ放射板１上の第２の線分１０上において常に電位が零となるため、この線分上に位置する第１の給電ポート３へは第２の給電ポート４から入力された所望周波数の信号は漏れることは無いと言える。上記のような特性を実現するため、第１の給電ポート３と放射板１の中点を結ぶ直線と第２の給電ポート４と放射板１の中点を結ぶ直線は、放射板１の中点において直交するように各給電ポート位置は決められている。
【００４３】
また、第１の線分９および第２の線分１０上において、基体５，６の材料特性が変更されているため、放射板１とグランド板２を共振器として考えた時に、放射板１とグランド板２の間の基体５，６の材質をその途中において変更することによりＳＩＲ構造（Ｓｔｅｐｐｅｄ　Ｉｍｐｅｄａｎｃｅ　Ｒｅｓｏｎａｔｏｒ）とすることができ、共振器長を短くすることが可能となるため、結果として、アンテナ装置の小型化を図ることが可能となる。
【００４４】
（実施の形態２）
図２（ａ）および図２（ｂ）は本発明の第２の実施の形態によるアンテナ装置であり、図２（ａ）および（ｂ）のアンテナ装置は、実施の形態１の第１の基体５と第２の基体６が充填される領域の境界線１１を放射板１の周辺部から放射板１の中点の方向に電気長で概ね１／８波長内側へ入った点としたものである。
【００４５】
１／４波長共振器を最も短く設計したい場合の共振器形状である共振器の中点（端部より１／８波長の点）において特性インピーダンスを大きく変化させた形状をアンテナ装置に適用することにより、アンテナ装置の小型化を図ったものである。
【００４６】
（実施の形態３）
図３（ａ）および図３（ｂ）は本発明の第３の実施の形態によるアンテナ装置であり、図３（ａ）および（ｂ）のアンテナ装置は、実施の形態２の第１の線分９の長さを第２の線分１０の長さと異ならせたものである。これに併せて、基体５，６の境界線１１についても、第１の線分９および第２の線分１０上における放射板１の周辺部から電気長で概ね１／８波長の位置に存在することにより、放射板１の形状である楕円形状と相似形である楕円形状となる。放射板１の形状を楕円形とすることにより第１の給電ポート３と第２の給電ポート４の共振周波数を異ならせることが可能となる。
【００４７】
このアンテナ装置の使用例としては、第１の給電ポート３をＧＳＭシステムの送信用として、また第２の給電ポート４を受信用として用いることができ、両ポート間のアイソレーションがアンテナ装置自体で確保されているため、アンテナ装置の直下に共用器を配置する必要が無くなる。また、２つのシステムに対応したアンテナ装置として使用できるため、例えば、第１の給電ポート３をＷ−ＬＡＮ用として、また第２の給電ポート４をＢｌｕｅｔｏｏｔｈ用として用いることが可能となる。
【００４８】
（実施の形態４）
図４（ａ），（ｂ），（ｃ）は本発明の第４の実施の形態によるアンテナ装置であり、図４（ａ）の放射板１の斜視図において、グランド板２に対向して配設された放射板１の周辺部に第１の給電ポート３と第２の給電ポート４と第３の給電ポート１２を設けた複数給電ポートを有するアンテナ装置となっている。
【００４９】
図４（ａ）に示した３つの給電ポート３，４，１２を有したアンテナ装置の放射板１のサイズと各給電ポート３，４，１２の配設位置を図４（ｂ）に示す。放射板１の形状は直径が所望の周波数の１波長（電気長）となる円状であり、各給電ポートと放射板の中点を結ぶ直線が放射板１の中点において互いに６０度の角度を持って交差するような位置に各給電ポート３，４，１２が配置されたアンテナ構成となっている。
【００５０】
第１の給電ポート３のみに所望の周波数の信号を入力した場合、放射板１とグランド板２が第１の給電ポート３と放射板１の中点を結んだ直線上における端部開放１波長共振器として動作し、第１の共振電流７が放射板１上を流れることとなる。端部開放１波長共振器の動作は、端部開放１／２波長共振器を２つ接続したものとして考えればよいため、第１の給電ポート３と放射板１の中点を結ぶ直線に対して、放射板１の周辺部から１／４波長の位置において直交する第３の線分１５および第４の線分１６上において電位が常にほぼ零となる。
【００５１】
同様の原理で、第２の給電ポート４のみに所望周波数の信号を入力した場合、第５の線分１７および第６の線分１８上において電位が常にほぼ零となり、第３の給電ポート１２のみに所望周波数の信号を入力した場合、第７の線分１９および第８の線分２０上において電位が常にほぼ零となる。それぞれの給電ポート位置が電位零となる線分上にあるため、他の給電ポートの入力信号が漏れ込むことはない。
【００５２】
また、放射板１の周辺部から電気長で概ね１／８波長の領域に充填される第１の基体５および放射板１の中央部から電気長で概ね半径１／８波長の領域に充填される第３の基体１３の比透磁率を比誘電率で割った値は、それ以外の領域に充填される第２の基体の比透磁率を比誘電率で割った値よりも小さくなるように基体材料が選択されている。これにより、最も小型化することが可能である先端より１／８波長の点で特性インピーダンスが変化されたＳＩＲ構成の１／４共振器を連結した構成となるため、結果として、アンテナ装置を小型化することが可能となる。
【００５３】
本発明のアンテナ装置の使用例としては、３つの給電ポート３，４，１２をすべてＷ−ＬＡＮの偏波ダイバーシティアンテナとして用いることもできるし、第１の給電ポート３をＷ−ＬＡＮ用のアンテナとし、第２の給電ポート４と第３の給電ポート１２をＢｌｕｅｔｏｏｔｈ用の偏波ダイバーシティアンテナとして使用することができ、３本必要であったアンテナ装置を１本にて具現化することができることより、アンテナ装置に関わるコストの低減を図ることができるとともに通信機器の小型化を図ることが可能となる。
【００５４】
図４（ｃ）は、放射板１の形状を円状から正六角形状へ変更した場合を示しているが、円状および正六角形状の放射板１ともに、放射板１の中点に対して点対称であるため、どちらのアンテナ装置も同様の動作をする。但し、第１と第２の基体５，６の境界線１１および第２と第３の基体６，１３の境界線２１は、それぞれ放射板１の周辺部から電気長で１／８波長、３／８波長離れた場所となり、結果的に、放射板１の形状と相似な正六角形状となる。尚、本実施の形態４においては円状、正六角形状の放射板１にて説明を行ったが、放射板１の中点に対して点対称となる形状を有する放射板であれば、本発明と同様な効果が得られることは言うまでもない。
【００５５】
（実施の形態５）
図５（ａ）および図５（ｂ）は本発明の第５の実施の形態によるアンテナ装置であり、実施の形態２のアンテナ装置における各給電ポート３，４と放射板１の接続部分の形状を変更し、放射板１の中央部に第４の給電ポート２２を付加したものである。第１の給電ポート３と放射板１の間にギャップ２３を設け、このギャップ２３の間隔、幅を調整することにより第１の給電ポート３と放射板１のインピーダンス整合をとることが可能となる。また、第２の給電ポート４と放射板１の間をインターディジタル構造２４とすることにより、第２の給電ポート４と放射板１の間の容量値を大きく設定することが可能となり、第２の給電ポート４のインピーダンス調整の範囲を広げることができる。
【００５６】
第４の給電ポート２２は放射板１の中点に配設される。これは、放射板１の中点が第１の給電ポート３および第２の給電ポート４に給電したときにおいても常に電位が零となるためである。なぜなら、第１の給電ポート３のみに所望周波数信号を供給したときに放射板１上に発生する電位が常に零となる第１の線分９と、第２の給電ポート４のみに所望周波数信号を供給したときに放射板１上に発生する電位が常に零となる第２の線分１０が交差する点が放射板１の中点となるためである。
【００５７】
通常、第４の給電ポート２２の直下には放射板１との整合を取るための整合回路が必要となるため、放射板１とグランド板２の間に充填されている基体を積層構造とし、その整合回路を基体により具現化しても良い。
【００５８】
また、第４の給電ポート２２で使用する周波数は第１の給電ポート３および第２の給電ポート４で使用する周波数と異ならせた方が、それらの給電ポートとの間のアイソレーション値を大きくすることが可能となる。このような本アンテナ装置の特性を考慮した上で、本アンテナ装置の使用例としては、第１の給電ポート３と第２の給電ポート４をＷ−ＬＡＮの偏波ダイバーシティアンテナとして、第４の給電ポート２２をテレビ、ＧＰＳ、ＰＤＣ等の２．４ＧＨｚ帯以外の周波数を用いるシステム用のアンテナとして使用する場合が考えられる。
【００５９】
（実施の形態６）
図６（ａ）および図６（ｂ）は本発明の第６の実施の形態によるアンテナ装置であり、図６（ａ）において、対角線の電気長が概ね１／２波長である正四角形状の放射板１がグランド板２に対向して存在し、放射板１とグランド板２の間には第１の基体５と第２の基体６が充填されている。第１の基体５と第２の基体６の境界線１１は放射板１の周辺部から放射板１の中点へ向けて電気長で１／８波長内側へ入った所に存在し、第１の基体５の比透磁率を比誘電率で割った値は第２の基体６の比透磁率を比誘電率で割った値よりも小さくなるように基材の選択がされている。
【００６０】
第１の給電ポート３および第２の給電ポート４は、放射板１の周辺部ではなく、放射板１の内側に存在し、各給電ポート３，４と放射板１の中点を結ぶ第１の線分９および第２の線分１０が放射板１の中点において直交するように配置される。このように、各給電ポート３，４を第１の線分９または第２の線分１０上の任意位置に配設することにより、整合回路を用いることなく各給電ポートのインピーダンス整合をとることができる。
【００６１】
また、第１の線分９および第２の線分１０に対して放射板１の形状が線対称となるように、放射板１の周辺部にスリット２５を設けることにより、アンテナ装置の共振周波数を下げることができ、結果としてアンテナ装置を小型化することが可能となる。
【００６２】
本実施の形態６においては、四角形状の放射板１の周辺部にスリット２５を設けた場合を示したが、円状、正多角形状、方形状の放射板の場合にも同様の効果が得られることは言うまでもない。
【００６３】
（実施の形態７）
図７（ａ）と図７（ｂ）は本発明の第７の実施の形態によるアンテナ装置であり、同図７において、誘電体または磁性体または誘電体と磁性体の混合材料からなる円筒状の第２の基体６（直径が電気長で１／４波長）の周囲に第２の基体６と成分の異なるドーナツ状（直径が電気長で１／２波長）の第１の基体５が配置され、第１の基体５の上面部分および第１の基体５の上面より上方の第２の基体６の表面部分に放射板１を形成し、第１の給電ポート３と第２の給電ポート４が放射板１の周辺部に接続されるとともに、各給電ポート３，４と放射板１の中点を結ぶ直線が直交するような位置に各給電ポート３，４が接続されている。また、第１の基体５の比透磁率を比誘電率で割った値は第２の基体６の比透磁率を比誘電率で割った値よりも小さくなるように基材が選択されている。
【００６４】
これにより第２の基体６が充填されている領域の放射板１とグランド板２の間の特性インピーダンスは第１の基体５が充填されている領域よりも大きな特性インピーダンスを実現できる。更に、第２の基体６が存在する領域における放射板１とグランド板２の間隔は第１の基体５が存在する領域における放射板１とグランド板２の間隔よりも広いため、構造的にも第２の基体６が充填されている領域の特性インピーダンスを大きく設計することができる。
【００６５】
以上説明してきたように、放射板１の周辺部から電気長で１／８波長の点において材料的、構造的に特性インピーダンスを変化させることができるため、ＳＩＲ構造を材料、構造の両面にて具現化でき、アンテナ装置を小型化することができる。
【００６６】
（実施の形態８）
図８（ａ）および図８（ｂ）は本発明の第８の実施の形態によるアンテナ装置であり、実施の形態７における放射板１の外形の形状を円状から正四角形状へ変更したものである。これに従い、第２の基体６の形状についても１辺が電気長で１／４波長の底面を有する正四角柱となっている。放射板１の外形の形状が円状、正四角形状ともに各給電ポート３，４と第２の基体６の上面の中心点を結ぶ直線に対して線対称であるため、どちらも同様の特性を有する。
【００６７】
（実施の形態９）
図９は本発明の第９の実施の形態によるアンテナ装置であり、実施の形態７のアンテナ装置における第１の給電ポート３と第２の基体６の上面中点を結ぶ線分と第２の給電ポート４と第２の基体６の上面中点を結ぶ線分の長さを異ならせたアンテナ装置である。このような構成により、第１の給電ポート３と第２の給電ポート４の共振周波数の異なる小型なアンテナ装置を実現することが可能となる。
【００６８】
（実施の形態１０）
図１０（ａ）と図１０（ｂ）は本発明の第１０の実施の形態によるアンテナ装置であり、図１０（ａ）は図４（ａ）のアンテナ装置について、実施の形態８と同様に第２の基体６が充填されている領域における放射板１とグランド板２の間隔を広げたものである。このような構成によって、特性インピーダンスの変化をより大きくすることが可能となるため、小型なアンテナ装置を実現することができる。
【００６９】
また、図１０（ｂ）は図１０（ａ）のアンテナ装置における各給電ポート３，４をグランド板２に対して直角に立ち上げず、任意の角度をもって形成したものである。このような構成を取ることにより、給電ポート３，４間の電磁結合を弱くすることが可能となり、給電ポート間のアイソレーション値を高く設計する事が可能となる。
【００７０】
（実施の形態１１）
図１１（ａ）と図１１（ｂ）は本発明の第１１の実施の形態によるアンテナ装置であり、実施の形態２に示したアンテナ装置において、第１の給電ポート３の位置の放射板１の中点に対して点対称となる放射板１の周辺部に第１のリアクタンス素子２６の一方先端を電気的に接続し、他方先端をグランド板２に電気的に接続するとともに、第２の給電ポート４の位置の放射板１の中点に対して点対称となる放射板１の周辺部に第２のリアクタンス素子２７を電気的に接続したものである。これらのリアクタンス素子により各給電ポート３，４に給電した場合の電気長を長くできることより、アンテナ装置の小型化を図ることが可能であり、またリアクタンス素子の形状を研磨して調整することにより、アンテナ装置のインピーダンスの調整を行うこともできる。
【００７１】
（実施の形態１２）
図１２（ａ）と図１２（ｂ）は本発明の第１２の実施の形態によるアンテナ装置であり、実施の形態７においては放射板１を凸形状の断面とすることにより放射板１とグランド板２の間の距離を広げたのに対して、本実施の形態１２ではグランド板２を凹形状の断面とすることにより放射板１とグランド板２の間の距離を広げたものである。どちらの構成を用いたとしても、ＳＩＲ構造を実現することが可能であるため、実施の形態７と同様にアンテナ装置を小型化できる効果を有する。
【００７２】
【発明の効果】
以上のように本発明によれば、１つのアンテナにアイソレーションの確保された２つ以上の給電ポートを設けることが可能となるとともに、このようなアンテナ装置の小型化を実現することも可能となる。
【図面の簡単な説明】
【図１】（ａ）本発明の第１の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第１の実施の形態によるアンテナ装置の上面図
【図２】（ａ）本発明の第２の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第２の実施の形態によるアンテナ装置の上面図
【図３】（ａ）本発明の第３の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第３の実施の形態によるアンテナ装置の上面図
【図４】（ａ）本発明の第４の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第４の実施の形態によるアンテナ装置の上面図
（ｃ）本発明の第４の実施の形態によるアンテナ装置の上面図
【図５】（ａ）本発明の第５の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第５の実施の形態によるアンテナ装置の上面図
【図６】（ａ）本発明の第６の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第６の実施の形態によるアンテナ装置の上面図
【図７】（ａ）本発明の第７の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第７の実施の形態によるアンテナ装置の側面図
【図８】（ａ）本発明の第８の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第８の実施の形態によるアンテナ装置の側面図
【図９】本発明の第９の実施の形態によるアンテナ装置の斜視図
【図１０】（ａ）本発明の第１０の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第１０の実施の形態によるアンテナ装置の斜視図
【図１１】（ａ）本発明の第１１の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第１１の実施の形態によるアンテナ装置の上面図
【図１２】（ａ）本発明の第１２の実施の形態によるアンテナ装置の斜視図
（ｂ）本発明の第１２の実施の形態によるアンテナ装置の側面図
【図１３】従来のアンテナ装置の概要図
【符号の説明】
１　放射板
２　グランド板
３　第１の給電ポート
４　第２の給電ポート
５　第１の基体
６　第２の基体
７　第１の共振電流
８　第２の共振電流
９　第１の線分
１０　第２の線分
１１　第１の基体と第２の基体の境界線
１２　第３の給電ポート
１３　第３の基体
１４　第３の共振電流
１５　第３の線分
１６　第４の線分
１７　第５の線分
１８　第６の線分
１９　第７の線分
２０　第８の線分
２１　第２の基体と第３の基体の境界線
２２　第４の給電ポート
２３　ギャップ
２４　インターディジタル構造
２５　スリット
２６　第１のリアクタンス素子
２７　第２のリアクタンス素子
１００　通信モジュール
１０１　Ｂｌｕｅｔｏｏｔｈ用アンテナ
１０２　Ｗ−ＬＡＮ用アンテナ
１０３　Ｂｌｕｅｔｏｏｔｈシステム
１０４　Ｗ−ＬＡＮシステム[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an antenna device mainly used for mobile communication and the like.
[0002]
[Prior art]
FIG. 13 shows a communication module that can be used by a plurality of information communication systems. The communication module 100 in FIG. 13 can use both a Bluetooth system 103 having an antenna 101 and a W-LAN system 104 having an antenna 102. In designing such a communication module 100, it should be noted that both systems 103 and 104 use the 2.4 GHz band and that both systems 103 and 104 are used at the same time. That is, when one system is transmitting, the other system may be in a receiving state. In this case, the signal of one system becomes interference noise in the other system, and the BER (Bit Error Rate: bit error rate) ) Can cause significant degradation.
[0003]
In order to prevent this, conventionally, two antennas or dual-frequency antennas are prepared, and in the communication module 100 of FIG. 13, each of the systems 103 and 104 is provided with antennas 101 and 102, respectively. This prevents signals from jumping between systems.
[0004]
As prior art document information related to the invention of this application, for example, Patent Document 1 and Patent Document 2 are known.
[0005]
[Patent Document 1]
Japanese Patent No. 3114582
[Patent Document 2]
JP 2001-177330 A
[0006]
[Problems to be solved by the invention]
However, in the above configuration, the two antennas 101 and 102 need to be physically separated from each other, so that the size of the housing on which the communication module 100 is mounted is inevitably increased. Further, by using two antennas 101 and 102, it is necessary to secure two antenna mounting positions, and the manufacturing cost of the antennas 101 and 102 is doubled.
[0007]
In order to overcome these problems, the present invention realizes two antennas which have been required so far with one antenna. One antenna is provided with two or more feed ports, and the It is an object of the present invention to provide an antenna device which realizes a configuration capable of achieving isolation.
[0008]
[Means for Solving the Problems]
The antenna device according to the present invention is characterized in that two or more power supply ports are provided, and each power supply port is installed in a region where the power is always zero potential on the radiation plate when power is supplied from the other power supply ports. . By arranging each power supply port at such a position, the potential at each power supply port position cannot be temporally fluctuated by a high frequency signal from another power supply port. By using such an antenna device, two antennas can be embodied with one antenna, so that the cost can be reduced and the housing is necessary. The antenna installation space can be reduced by half, and the size of the housing can be reduced.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 of the present invention is characterized in that a ground plate, a radiating plate arranged opposite to the ground plate, the shape of the radiating plate is point-symmetric with respect to the midpoint of the radiating plate, and a plurality of radiating plates are provided. A feed port is provided in a region of zero potential generated on the radiation plate at an arbitrary position on the radiation plate, and a base made of a dielectric or a magnetic material or a mixture of a dielectric and a magnetic material is provided between the radiation plate and the ground plate. The value obtained by dividing the relative magnetic permeability of the substrate by the relative permittivity at any point between the end of the radiating plate and the midpoint of the radiating plate on a straight line connecting each feed port and the midpoint of the radiating plate changes. The relative permeability of the substrate in the region near the midpoint of the radiation plate is compared with the relative permeability of the substrate in the region near the end of the radiation plate on the straight line divided by the relative permittivity. The value divided by the ratio is large, and this substrate is point-symmetric with respect to the midpoint of the radiation plate. The antenna device is configured as described above, and the isolation between the feed ports can be ensured, and when the radiating plate and the ground plate are considered as a resonator, the material of the base between the radiating plate and the ground plate is changed in the middle thereof. An SIR structure (Stepped Impedance Resonator) can be used, and the resonator length can be shortened. As a result, the antenna device can be reduced in size.
[0010]
According to a second aspect of the present invention, there is provided a ground plate, a radiating plate disposed to face the ground plate, and a plurality of feed ports having zero potential generated on the radiating plate at an arbitrary position of the radiating plate. It is provided in the area, and the shape of the radiation plate is line-symmetric with respect to the straight line connecting each feed port and the radiation plate, and it is composed of a dielectric or magnetic material or a mixture of dielectric and magnetic material between the radiation plate and the ground plate The relative permeability of the substrate is divided by the relative permittivity at an arbitrary point between the end of the radiating plate and the midpoint of the radiating plate on a straight line connecting each feed port and the midpoint of the radiating plate. The relative permeability of the substrate in the region near the midpoint of the radiation plate is smaller than the relative permeability of the substrate in the region near the end of the radiation plate on the straight line divided by the relative permittivity. The value obtained by dividing the magnetic susceptibility by the relative permittivity is large. An antenna device that is configured to be symmetrical with respect to a straight line connecting the midpoints of the radiation plates.The resonance frequency of the radiation plate at each power supply port can be different, and isolation between the power supply ports can be ensured. Further, by changing the material of the base between the radiation plate and the ground plate in the middle thereof, the SIR structure can be obtained, and the size of the antenna device can be reduced.
[0011]
According to a third aspect of the present invention, in the first aspect of the present invention, a circular radiation plate having a diameter of an electrical length of approximately 波長 wavelength and a straight line connecting each feeding port and a midpoint of the radiation plate. An antenna device composed of a regular polygonal radiation plate having an electrical length of approximately 波長 wavelength from the end of one radiation plate to the end of the other radiation plate. In the antenna device, two power supply ports in which the isolation between the power supply ports is ensured can be realized.
[0012]
According to a fourth aspect of the present invention, in the second aspect of the present invention, the elliptical radiation plate or each power supply in which the electric length of each of the major axis and the minor axis is approximately １／ wavelength of the desired frequency is used. It consists of a square radiation plate other than a regular polygon with an electrical length of approximately 1/2 wavelength from the end of one radiation plate to the end of the other radiation plate on the straight line connecting the port and the midpoint of the radiation plate 3. The antenna device according to claim 2, wherein two feeding ports having different resonance frequencies, in which isolation is ensured, can be realized in one antenna device.
[0013]
The invention according to claim 5 of the present invention is the invention according to claim 3 or 4, wherein the electric length is substantially equal to the electric length from the end of the radiation plate on a straight line connecting each feed port and the midpoint of the radiation plate. This is an antenna device in which the value obtained by dividing the relative magnetic permeability of the substrate between the ground plate and the radiation plate by the relative permittivity at the position of 1/8 wavelength is increased. By applying to the antenna device a shape in which the characteristic impedance is greatly changed at the middle point of the resonator (a point 1/8 wavelength from the end), the antenna device can be downsized. Become.
[0014]
According to a sixth aspect of the present invention, in the first aspect of the invention, there is provided a circular radiating plate having a diameter of an electrical length of approximately [1 + 0.5 × n (n is an integer of 0 or more)]. The electrical length from the end of one radiating plate to the end of the other radiating plate on a straight line connecting each feeding port and the midpoint of the radiating plate is approximately [1 + 0.5 × n (n is an integer of 0 or more)]. This is an antenna device including a radiation plate having a regular polygonal shape with a wavelength, and can realize three feed ports in which isolation between feed ports is ensured in one antenna device.
[0015]
According to a seventh aspect of the present invention, in the second aspect, the electric length of each of the major axis and the minor axis is substantially equal to the desired frequency [1 + 0.5 × n (n is an integer of 0 or more). The electrical length from the end of one radiating plate to the end of the other radiating plate on a straight line connecting the elliptical radiating plate or each feed port and the radiating plate to the midpoint of the radiating plate is approximately [1 + 0.5 × n (n is an integer of 0 or more)] is an antenna device including a radiation plate having a rectangular shape other than a regular polygon having a wavelength. By increasing the shape of the radiation plate, the radiation gain can be improved. .
[0016]
According to an eighth aspect of the present invention, in the invention according to the sixth or seventh aspect, on a straight line connecting each power supply port and the midpoint of the radiation plate, the electric length is substantially from the end of the radiation plate. The value obtained by dividing the relative magnetic permeability of the substrate in the region from the position of 4 × n / 8 (n is an integer of 0 or more) wavelength to (1 + 4 × n) / 8 (n is an integer of 0 or more) by the relative dielectric constant is as follows. An antenna device in which the relative magnetic permeability of the substrate in the other region is made smaller than the value obtained by dividing the relative magnetic permeability by the relative dielectric constant. The resonator has a resonator shape when the quarter wavelength resonator is to be designed to be the shortest. It is possible to reduce the size of the antenna device by applying to the antenna device a shape obtained by continuously connecting shapes in which the characteristic impedance is greatly changed at the midpoint of (1/8 wavelength from the end). It becomes.
[0017]
According to a ninth aspect of the present invention, in the first or second aspect, the radiation plate is provided with a first power supply port and a second power supply port, and the position of each power supply port and the radiation In the antenna device, the straight lines connecting the middle point of the plate are mutually orthogonal, and when power is supplied to the first feeding port, the straight line connecting the first feeding port and the middle point of the radiating plate is shifted to the middle point of the radiating plate. Since the potential becomes 0 on a straight line orthogonal to the above and the same phenomenon occurs when power is supplied to the second power supply port, the straight lines connecting the respective power supply port positions and the midpoint of the radiation plate are orthogonal to each other. By providing each power supply port as described above, it is possible to ensure isolation between the power supply ports.
[0018]
According to a tenth aspect of the present invention, in the invention according to the seventh aspect, the radiation plate is provided with a first power supply port, a second power supply port, and a third power supply port. This is an antenna device in which a straight line connecting the radiation plate and the midpoint of the radiation plate intersects each other at an angle of 60 degrees. Only in such a positional relationship of the feed ports, mutual isolation can be secured in the periphery of the radiation plate. It becomes possible to provide three power supply ports.
[0019]
An invention according to claim 11 of the present invention is the antenna device according to claims 1 and 2, wherein the power supply port is provided at an end of the radiation plate. In consideration of the above, it is easier to provide a power supply port on the outer peripheral portion of the radiation plate.
[0020]
According to a twelfth aspect of the present invention, there is provided the antenna according to the first or second aspect, wherein the feeding port is provided on a straight line connecting an arbitrary point at the end of the radiating plate and the midpoint of the radiating plate. This is a device, and it is possible to match each power supply port by providing the power supply unit inside the periphery of the radiation plate.
[0021]
A thirteenth aspect of the present invention is the antenna apparatus according to the first or second aspect, wherein the power supply port is connected to the radiation plate via the gap, and the gap interval is adjusted. Accordingly, the antenna device can be matched without using a matching circuit, and the cost and mounting space required for the matching circuit can be reduced.
[0022]
A fourteenth aspect of the present invention is the antenna apparatus according to the thirteenth aspect, wherein the shape of the feed port and the radiation plate facing the gap has an interdigital structure, and a capacitance generated in the gap is provided. Since the value can be increased, the adjustment range of the impedance matching can be expanded.
[0023]
The invention according to claim 15 of the present invention is the antenna device according to claim 1 or 2, wherein a power supply port is provided at a middle point of the radiation plate, and radiation is performed even when power is supplied to each power supply port. Since the potential is always zero at the midpoint of the plate, adding an arbitrary impedance element to the midpoint of the radiating plate does not affect each power supply port. A port can be provided.
[0024]
According to a sixteenth aspect of the present invention, in the first or second aspect, the resonance frequency of the radiation plate at the power supply port provided at the midpoint of the radiation plate is the resonance frequency of the other power supply ports. This is an antenna device configured differently from the above, and can increase the isolation value between the power supply port at the center of the radiation plate and the other power supply ports.
[0025]
According to a seventeenth aspect of the present invention, in the first or the second aspect of the present invention, on a straight line connecting the feeding port and the midpoint of the radiating plate, the midpoint of the radiating plate extends from an end of the radiating plate. The distance between the radiating plate and the ground plate changes during this period, and the distance between the radiating plate and the ground plate at the midpoint of the radiating plate is wider than the end of the radiating plate. When considered as a resonator, the resonator structure can be changed to an SIR structure (Stepped Impedance Resonator) by changing the interval between the radiation plate and the ground plate halfway, and the length of the resonator can be shortened. As a result, it is possible to reduce the size of the antenna device.
[0026]
According to an eighteenth aspect of the present invention, in the invention according to the seventeenth aspect, on the straight line connecting the feed port and the midpoint of the radiation plate, the electric length of the electric length is approximately １／ wavelength from the end of the radiation plate. This is an antenna device in which the distance between the radiation plate and the ground plate is widened at the point, and the midpoint of the resonator (point of 1/8 wavelength from the end) is the resonator shape when the quarter wavelength resonator is to be designed to be the shortest. By applying to the antenna device a shape in which the characteristic impedance is greatly changed in ()), the antenna device can be reduced in size.
[0027]
According to a nineteenth aspect of the present invention, in the first or the second aspect of the present invention, the cross section of the radiating plate is formed by connecting the projections on a straight line connecting the feeding port and the midpoint of the radiating plate. An antenna device comprising a radiating plate and a valley having a convex shape at the periphery of the radiating plate. The end of one radiating plate to the end of the other radiating plate on a straight line connecting a feeding port and a midpoint of the radiating plate. By using a radiating plate having an electrical length up to about 波長 wavelength or more, a high radiation gain and a wide band characteristic can be realized.
[0028]
A twentieth aspect of the present invention is the antenna apparatus according to the eighteenth aspect, wherein the cross-sectional shape of the radiation plate is formed by a series of convex shapes having an electrical length of approximately 波長 wavelength, An antenna having a 波長 wavelength resonator in which Ｓ wavelength resonators of SIR configuration whose characteristic impedance changes at a １／ wavelength from the short circuit end, which can be miniaturized most, are connected to each other at the short circuit terminal. This is applied to a device, and can be reduced in size.
[0029]
According to a twenty-first aspect of the present invention, in the first or the second aspect of the present invention, a cross section of the ground plate is formed by connecting concave portions in a straight line connecting the feeding port and the midpoint of the radiation plate. It is an antenna device in which the ground plate portion facing the peripheral portion of the radiation plate is a concave-shaped peak, and when the radiation plate and the ground plate are considered as a resonator, the interval between the radiation plate and the ground plate is set in the middle. By making the change, the resonator structure can be changed to the SIR structure, and the length of the resonator can be shortened. As a result, the size of the antenna device can be reduced.
[0030]
According to a twenty-second aspect of the present invention, there is provided the antenna device according to the twenty-first aspect, wherein the cross-sectional shape of the radiating plate is formed by connecting a concave shape having an electrical length of approximately １／ wavelength. By applying a shape in which the characteristic impedance is largely changed at the middle point of the resonator (point 共振 wavelength from the end), which is the resonator shape when the quarter wavelength resonator is to be designed to be the shortest, to the antenna device. In addition, the size of the antenna device can be reduced.
[0031]
According to a twenty-third aspect of the present invention, in the invention according to the first or second aspect, a peripheral portion of the radiation plate which is axisymmetric with respect to a line connecting the feeding port and the midpoint of the radiation plate. This is an antenna device with an arbitrary number of slits at arbitrary positions, and the slits enable the electrical length of the radiation plate to be set to be equivalently longer, and as a result, the antenna device can be downsized. It becomes.
[0032]
According to a twenty-fourth aspect of the present invention, in the first or second aspect, the power supply port is formed of a conductive line, and the conductive line is formed at an arbitrary angle with respect to a ground plate. When all feed ports are composed of conductive lines that rise vertically to the ground plane, there is a possibility that coupling may occur between feed ports. An antenna device capable of designing high isolation between feed ports without arranging ports in parallel can be realized.
[0033]
According to a twenty-fifth aspect of the present invention, in the first or the second aspect of the invention, the center of the substantially circular radiation plate or the intersection of the diagonal lines of the substantially regular radiation plate is used as a reference. An antenna device in which a reactive element whose open end is open or a reactive element whose open end is electrically connected to a ground plate is added to a position symmetrical with respect to the position of the power supply port when the antenna is electrically conductive. Since the electrical length of the device can be designed to be equivalently long, as a result, it is possible to reduce the size of the antenna device.
[0034]
The invention according to claim 26 of the present invention is the antenna device according to claim 25, wherein the isolation between the ports is adjusted by cutting off the tip of the reactance element whose tip is open. Since the characteristics of the antenna device, which change depending on the housing on which the antenna device is mounted, can be adjusted by adjusting the length of the conductive element having the open end, it is possible to quickly respond to various housings.
[0035]
The invention according to claim 27 of the present invention is the antenna apparatus according to claim 1 or 2, wherein each power supply port is used for diversity communication, and the antenna used for diversity communication is used. Can be reduced from two to one, so that a low-cost and small-sized diversity antenna device can be realized.
[0036]
The invention according to claim 28 of the present invention is the antenna device according to claim 1 or 2, wherein each power supply port is used for communication of a different system, and isolation between the ports is ensured. Therefore, there is no need to prepare a duplexer for demultiplexing the signal for each system directly under the antenna, which can reduce the cost and mounting space required for the duplexer and simultaneously use W-LAN and Bluetooth. For mobile terminals that use the same frequency, it is impossible for the duplexer to separate the two system signals because the two systems use the same frequency. It is necessary to use both antennas separated by a certain distance in order to secure the operation, but if the antenna device of the present invention is used, one antenna can be used. It becomes possible embodied by the antenna device can be reduced the cost required for the antenna, it can also be downsized terminal.
[0037]
According to a twenty-ninth aspect of the present invention, in the first or second aspect, the first power supply port is used for communication of the first system, and the second power supply port is connected to the third power supply port. An antenna device that uses a power supply port for diversity communication of the second system. A diversity antenna and a duplexer can be integrated, and the size of a mobile terminal can be reduced.
[0038]
The invention according to claim 30 of the present invention is the antenna device according to claim 1 or 2, wherein the first power supply port is used for communication of the first system, and the second power supply port is connected to the second power supply port. 3 is an antenna device that uses the power supply port 3 for transmission and reception of the second system. It is possible to integrate a duplexer for demultiplexing a signal and a duplexer for transmitting and receiving signals for each system. It is possible, and it is possible to reduce the size of a multifunction-compatible portable terminal.
[0039]
(Embodiment 1)
FIGS. 1A and 1B show an antenna device according to a first embodiment of the present invention. The antenna device shown in FIG. 1A is a radiating plate disposed so as to face a ground plate 2. 1. An antenna device having a plurality of power supply ports provided with a first power supply port 3 and a second power supply port 4 in a peripheral portion of a first base member 1 and a first base member 5 and a second base member Of the base 6. The base is changed from the first base 5 to the second base 6 in the middle of a line segment connecting the positions of the power supply ports 3 and 4 and the midpoint of the radiation plate 1. The base material is selected such that the value obtained by dividing the relative permeability of the base 5 by the relative permittivity is smaller than the value obtained by dividing the relative permeability of the second base 6 by the relative permittivity.
[0040]
FIG. 1B shows the size of the radiation plate 1 of the antenna device having the two feed ports 3 and 4 shown in FIG. 1A and the arrangement positions of the feed ports 3 and 4. The shape of the radiation plate 1 is a circle having a diameter that is 波長 wavelength (electric length) of a desired frequency, and a first power supply port 3 and a second power supply port 4 are provided in a peripheral portion of the radiation plate 1. It has a configuration.
[0041]
When a signal of a desired frequency is input only to the first power supply port 3, the radiation plate 1 and the ground plate 2 are open / closed on a straight line connecting the first power supply port 3 and the midpoint of the radiation plate 1. It operates as a two-wavelength resonator, and the first resonance current 7 flows on the radiation plate 1. At the midpoint of the open-ended half-wavelength resonator, the potential becomes zero. That is, the potential is always zero on the first line segment 9 on the radiation plate 1. Since the second power supply port 4 is located on the first line segment 9 at which the potential becomes zero, a high-frequency signal of a desired frequency input from the first power supply port 3 leaks to the second power supply port 4. There is no.
[0042]
According to the same principle, when a signal of a desired frequency is input only to the second power supply port 4, a second resonance current 8 flows on the radiation plate 1 and a second line segment 10 on the radiation plate 1 , The potential is always zero, so it can be said that the signal of the desired frequency inputted from the second power supply port 4 does not leak to the first power supply port 3 located on this line segment. In order to realize the above characteristics, a straight line connecting the first feeding port 3 and the middle point of the radiation plate 1 and a straight line connecting the second feeding port 4 and the middle point of the radiation plate 1 Each power supply port position is determined so as to be orthogonal at a point.
[0043]
Further, since the material characteristics of the bases 5 and 6 are changed on the first line segment 9 and the second line segment 10, when the radiation plate 1 and the ground plate 2 are considered as resonators, the radiation plate 1 By changing the material of the bases 5 and 6 between the base and the ground plate 2 on the way, a SIR structure (Stepped Impedance Resonator) can be obtained, and the length of the resonator can be shortened. It is possible to reduce the size of the antenna device.
[0044]
(Embodiment 2)
FIGS. 2A and 2B show an antenna device according to a second embodiment of the present invention. The antenna device shown in FIGS. 2A and 2B is the first base of the first embodiment. The boundary line 11 between the area filled with the second substrate 6 and the second substrate 6 is defined as a point which enters from the periphery of the radiation plate 1 to the midpoint of the radiation plate 1 by an electrical length of approximately 1/8 wavelength inside. is there.
[0045]
Applying a shape in which the characteristic impedance is largely changed at the middle point of the resonator (point １／ wavelength from the end), which is the resonator shape when the quarter wavelength resonator is to be designed to be the shortest, to the antenna device Thus, the size of the antenna device is reduced.
[0046]
(Embodiment 3)
FIGS. 3A and 3B show an antenna device according to a third embodiment of the present invention. The antenna device shown in FIGS. 3A and 3B is the first line of the second embodiment. The length of the segment 9 is different from the length of the second line segment 10. At the same time, the boundary line 11 between the bases 5 and 6 also exists at a position approximately 1/8 wavelength in electrical length from the peripheral portion of the radiation plate 1 on the first line segment 9 and the second line segment 10. By doing so, an elliptical shape similar to the elliptical shape of the radiation plate 1 is obtained. By making the shape of the radiation plate 1 elliptical, the resonance frequency of the first power supply port 3 and the second power supply port 4 can be made different.
[0047]
As an example of use of this antenna device, the first power supply port 3 can be used for transmission in the GSM system, and the second power supply port 4 can be used for reception, and the isolation between the two ports is controlled by the antenna device itself. Since it is secured, there is no need to dispose a duplexer directly below the antenna device. Further, since it can be used as an antenna device corresponding to two systems, for example, the first power supply port 3 can be used for W-LAN and the second power supply port 4 can be used for Bluetooth.
[0048]
(Embodiment 4)
FIGS. 4A, 4B, and 4C show an antenna device according to a fourth embodiment of the present invention. In the perspective view of the radiation plate 1 shown in FIG. The antenna device has a plurality of power supply ports provided with a first power supply port 3, a second power supply port 4, and a third power supply port 12 in a peripheral portion of the arranged radiation plate 1.
[0049]
FIG. 4B shows the size of the radiating plate 1 of the antenna device having the three feeding ports 3, 4, and 12 shown in FIG. 4A and the arrangement positions of the feeding ports 3, 4, and 12. The shape of the radiation plate 1 is a circular shape having a diameter of one wavelength (electric length) of a desired frequency, and a straight line connecting each feeding port and the midpoint of the radiation plate has an angle of 60 degrees with each other at the midpoint of the radiation plate 1. In this configuration, the power supply ports 3, 4, and 12 are arranged at positions where they intersect with each other.
[0050]
When a signal of a desired frequency is input only to the first power supply port 3, the radiation plate 1 and the ground plate 2 have one end open wavelength on a straight line connecting the first power supply port 3 and the midpoint of the radiation plate 1. It operates as a resonator, and the first resonance current 7 flows on the radiation plate 1. Since the operation of the open-ended one-wavelength resonator can be considered as connecting two open-ended half-wavelength resonators, a straight line connecting the first feeding port 3 and the midpoint of the radiation plate 1 can be used. Thus, the potential is always substantially zero on the third line segment 15 and the fourth line segment 16 orthogonal to each other at a position of １／ wavelength from the periphery of the radiation plate 1.
[0051]
According to the same principle, when a signal of a desired frequency is input only to the second power supply port 4, the potential always becomes almost zero on the fifth line segment 17 and the sixth line segment 18, and the third power supply port 12 When a signal of a desired frequency is input to only the seventh line segment 19 and the eighth line segment 20, the potential is always substantially zero. Since the position of each power supply port is on the line where the potential is zero, the input signal of the other power supply port does not leak.
[0052]
In addition, the first base 5 is filled in a region of approximately 1/8 wavelength in electrical length from the periphery of the radiation plate 1 and is filled in a region of approximately 1/8 wavelength in electrical length from the center of the radiation plate 1. The value obtained by dividing the relative permeability of the third base 13 by the relative permittivity is smaller than the value obtained by dividing the relative permeability of the second base filled in the other region by the relative permittivity. The substrate material has been selected. As a result, the configuration is such that the 1/4 resonator of the SIR configuration in which the characteristic impedance is changed at a point of 1/8 wavelength from the tip which can be miniaturized most is connected. Can be realized.
[0053]
As an example of use of the antenna device of the present invention, all three feeding ports 3, 4, and 12 can be used as a W-LAN polarization diversity antenna, and the first feeding port 3 can be used as a W-LAN antenna. Then, the second power supply port 4 and the third power supply port 12 can be used as a polarization diversity antenna for Bluetooth, and three antenna devices can be realized by one. In addition, it is possible to reduce the cost related to the antenna device and to reduce the size of the communication device.
[0054]
FIG. 4C shows a case where the shape of the radiation plate 1 is changed from a circular shape to a regular hexagonal shape. Because of point symmetry, both antenna devices operate in a similar manner. However, the boundary 11 between the first and second bases 5 and 6 and the boundary 21 between the second and third bases 6 and 13 are each 1/8 wavelength in electrical length from the periphery of the radiation plate 1, / 8 wavelengths away, resulting in a regular hexagonal shape similar to the shape of the radiation plate 1. In the fourth embodiment, the circular and regular hexagonal radiation plate 1 has been described. However, if the radiation plate has a point-symmetric shape with respect to the midpoint of the radiation plate 1, the radiation plate 1 may have any shape. It goes without saying that the same effect as the invention can be obtained.
[0055]
(Embodiment 5)
5 (a) and 5 (b) show an antenna device according to a fifth embodiment of the present invention. FIG. 5 (a) is a plan view of the antenna device according to the second embodiment. And a fourth power supply port 22 is added to the central portion of the radiation plate 1. A gap 23 is provided between the first power supply port 3 and the radiation plate 1, and the gap and the width of the gap 23 are adjusted to allow impedance matching between the first power supply port 3 and the radiation plate 1. . Further, by forming the interdigital structure 24 between the second power supply port 4 and the radiation plate 1, it is possible to set a large capacitance value between the second power supply port 4 and the radiation plate 1. Of the power supply port 4 can be extended.
[0056]
The fourth power supply port 22 is provided at the midpoint of the radiation plate 1. This is because the potential is always zero even when the midpoint of the radiation plate 1 supplies power to the first power supply port 3 and the second power supply port 4. This is because, when the desired frequency signal is supplied only to the first power supply port 3, the potential generated on the radiation plate 1 is always zero, and the desired frequency signal is supplied only to the second power supply port 4. This is because the point at which the second line segment 10 at which the potential generated on the radiation plate 1 is always zero when the light is supplied intersects is the middle point of the radiation plate 1.
[0057]
Normally, a matching circuit for matching the radiation plate 1 is required immediately below the fourth power supply port 22, so that the base filled between the radiation plate 1 and the ground plate 2 has a laminated structure. The matching circuit may be embodied by a base.
[0058]
Further, when the frequency used in the fourth power supply port 22 is different from the frequency used in the first power supply port 3 and the second power supply port 4, the isolation value between these power supply ports is increased. It is possible to do. In consideration of such characteristics of the present antenna device, as an example of use of the present antenna device, the first power supply port 3 and the second power supply port 4 are used as W-LAN polarization diversity antennas. The power supply port 22 may be used as an antenna for a system using a frequency other than the 2.4 GHz band, such as a television, a GPS, and a PDC.
[0059]
(Embodiment 6)
FIGS. 6 (a) and 6 (b) show an antenna device according to a sixth embodiment of the present invention. In FIG. 6 (a), a diagonal line having a regular square shape having an electrical length of approximately 波長 wavelength is shown. The radiation plate 1 is opposed to the ground plate 2, and a space between the radiation plate 1 and the ground plate 2 is filled with a first base 5 and a second base 6. The boundary line 11 between the first base 5 and the second base 6 is located at a location where the electrical length is １／ wavelength inward from the periphery of the radiation plate 1 to the midpoint of the radiation plate 1. The base material is selected such that the value obtained by dividing the relative permeability of the base 5 by the relative permittivity is smaller than the value obtained by dividing the relative permeability of the second base 6 by the relative permittivity.
[0060]
The first power supply port 3 and the second power supply port 4 are located not inside the radiation plate 1 but inside the radiation plate 1, and connect the first power supply ports 3 and 4 to the middle point of the radiation plate 1. The line segment 9 and the second line segment 10 are arranged so as to be orthogonal to each other at the midpoint of the radiation plate 1. By arranging the power supply ports 3 and 4 at arbitrary positions on the first line segment 9 or the second line segment 10 in this manner, impedance matching of each power supply port can be achieved without using a matching circuit. Can be.
[0061]
Also, by providing slits 25 around the radiation plate 1 so that the shape of the radiation plate 1 is axisymmetric with respect to the first line segment 9 and the second line segment 10, the resonance frequency of the antenna device can be improved. Can be reduced, and as a result, the antenna device can be downsized.
[0062]
In the sixth embodiment, the case where the slit 25 is provided in the peripheral portion of the rectangular radiation plate 1 has been described, but the same effect can be obtained in the case of a circular, regular polygonal, or rectangular radiation plate. Needless to say,
[0063]
(Embodiment 7)
FIGS. 7A and 7B show an antenna device according to a seventh embodiment of the present invention. In FIG. 7, a cylindrical member made of a dielectric material, a magnetic material, or a mixed material of a dielectric material and a magnetic material is used. Around the second substrate 6 (having a diameter of an electrical length of 1/4 wavelength), a donut-shaped (diameter having an electrical length of 1/2 wavelength) first component 5 having a component different from that of the second substrate 6 is disposed. Then, the radiation plate 1 is formed on the upper surface portion of the first base member 5 and the surface portion of the second base member 6 above the upper surface of the first base member 5, and the first power supply port 3 and the second power supply port 4 are formed. Are connected to the periphery of the radiation plate 1, and the power supply ports 3, 4 are connected at positions where the straight lines connecting the respective power supply ports 3, 4 and the midpoint of the radiation plate 1 are orthogonal to each other. The base material is selected such that the value obtained by dividing the relative magnetic permeability of the first base member 5 by the relative dielectric constant is smaller than the value obtained by dividing the relative magnetic permeability of the second base member 6 by the relative dielectric constant. .
[0064]
As a result, the characteristic impedance between the radiation plate 1 and the ground plate 2 in the region where the second base 6 is filled can be larger than that in the region where the first base 5 is filled. Further, since the distance between the radiation plate 1 and the ground plate 2 in the region where the second base 6 exists is larger than the distance between the radiation plate 1 and the ground plate 2 in the region where the first base 5 exists, the structure is also reduced. The characteristic impedance in the region where the second base 6 is filled can be designed to be large.
[0065]
As described above, since the characteristic impedance can be materially and structurally changed at a point of 1/8 wavelength in electrical length from the periphery of the radiation plate 1, the SIR structure can be used in both the material and the structure. It can be embodied, and the antenna device can be downsized.
[0066]
(Embodiment 8)
FIGS. 8A and 8B show an antenna device according to an eighth embodiment of the present invention, in which the outer shape of radiation plate 1 in the seventh embodiment is changed from a circular shape to a square shape. It is. Accordingly, the shape of the second base 6 is also a square prism having one side having an electric length and a bottom surface of 1/4 wavelength. Since the outer shape of the radiation plate 1 is circularly symmetric with respect to a straight line connecting each of the feeding ports 3 and 4 and the center point of the upper surface of the second base 6, both of the circular shape and the square shape have similar characteristics. Have.
[0067]
(Embodiment 9)
FIG. 9 shows an antenna device according to a ninth embodiment of the present invention. In the antenna device according to the seventh embodiment, a line segment connecting the first power supply port 3 and the midpoint of the upper surface of the second base 6 and the second This is an antenna device in which the length of a line connecting the feed port 4 and the middle point of the upper surface of the second base 6 is different. With such a configuration, it is possible to realize a small antenna device in which the first power supply port 3 and the second power supply port 4 have different resonance frequencies.
[0068]
(Embodiment 10)
FIGS. 10A and 10B show an antenna device according to a tenth embodiment of the present invention. FIG. 10A shows the antenna device of FIG. The distance between the radiation plate 1 and the ground plate 2 in the region where the second base 6 is filled is increased. With such a configuration, a change in characteristic impedance can be further increased, so that a small antenna device can be realized.
[0069]
FIG. 10B shows a configuration in which the power supply ports 3 and 4 in the antenna device of FIG. 10A are formed at an arbitrary angle without rising at right angles to the ground plate 2. By adopting such a configuration, it is possible to weaken the electromagnetic coupling between the power supply ports 3 and 4, and it is possible to design a high isolation value between the power supply ports.
[0070]
(Embodiment 11)
FIGS. 11A and 11B show an antenna device according to an eleventh embodiment of the present invention. In the antenna device shown in the second embodiment, the radiation plate 1 at the position of the first feeding port 3 is different from that of the antenna device shown in the second embodiment. The one end of the first reactance element 26 is electrically connected to the peripheral portion of the radiation plate 1 which is point-symmetric with respect to the midpoint, and the other end is electrically connected to the ground plate 2. The second reactance element 27 is electrically connected to the periphery of the radiation plate 1 which is point-symmetric with respect to the center of the radiation plate 1 at the position of the feed port 4. Since the electrical length when power is supplied to each of the power supply ports 3 and 4 can be increased by these reactance elements, it is possible to reduce the size of the antenna device, and by polishing and adjusting the shape of the reactance elements, The impedance of the antenna device can be adjusted.
[0071]
(Embodiment 12)
12 (a) and 12 (b) show an antenna device according to a twelfth embodiment of the present invention. In the seventh embodiment, the radiation plate 1 is connected to the ground by forming the radiation plate 1 into a convex cross section. In the twelfth embodiment, the distance between the radiation plate 1 and the ground plate 2 is increased by making the ground plate 2 have a concave cross section, while the distance between the plates 2 is increased. Whichever configuration is used, since the SIR structure can be realized, the antenna device can be downsized as in the seventh embodiment.
[0072]
【The invention's effect】
As described above, according to the present invention, it is possible to provide two or more power supply ports for which isolation is ensured in one antenna, and it is also possible to reduce the size of such an antenna device. Become.
[Brief description of the drawings]
FIG. 1A is a perspective view of an antenna device according to a first embodiment of the present invention.
(B) Top view of the antenna device according to the first embodiment of the present invention
FIG. 2A is a perspective view of an antenna device according to a second embodiment of the present invention.
(B) Top view of the antenna device according to the second embodiment of the present invention
FIG. 3 (a) is a perspective view of an antenna device according to a third embodiment of the present invention.
(B) Top view of the antenna device according to the third embodiment of the present invention
FIG. 4A is a perspective view of an antenna device according to a fourth embodiment of the present invention.
(B) Top view of the antenna device according to the fourth embodiment of the present invention
(C) Top view of the antenna device according to the fourth embodiment of the present invention.
FIG. 5A is a perspective view of an antenna device according to a fifth embodiment of the present invention.
(B) Top view of the antenna device according to the fifth embodiment of the present invention.
FIG. 6A is a perspective view of an antenna device according to a sixth embodiment of the present invention.
(B) Top view of the antenna device according to the sixth embodiment of the present invention.
FIG. 7A is a perspective view of an antenna device according to a seventh embodiment of the present invention.
(B) Side view of an antenna device according to a seventh embodiment of the present invention.
FIG. 8A is a perspective view of an antenna device according to an eighth embodiment of the present invention.
(B) Side view of an antenna device according to an eighth embodiment of the present invention.
FIG. 9 is a perspective view of an antenna device according to a ninth embodiment of the present invention.
FIG. 10 (a) is a perspective view of an antenna device according to a tenth embodiment of the present invention.
(B) A perspective view of an antenna device according to a tenth embodiment of the present invention.
FIG. 11 (a) is a perspective view of an antenna device according to an eleventh embodiment of the present invention.
(B) Top view of the antenna device according to the eleventh embodiment of the present invention.
FIG. 12 (a) is a perspective view of an antenna device according to a twelfth embodiment of the present invention.
(B) Side view of an antenna device according to a twelfth embodiment of the present invention.
FIG. 13 is a schematic diagram of a conventional antenna device.
[Explanation of symbols]
1 radiation plate
2 Ground plate
3 1st power supply port
4 Second power supply port
5 First substrate
6 Second substrate
7 First resonance current
8 Second resonance current
9 First line segment
10 Second line segment
11 Boundary line between first base and second base
12 Third power supply port
13 Third substrate
14 Third resonance current
15 Third line segment
16 Fourth line segment
17 Fifth line segment
18 Sixth line segment
19 Seventh line segment
20 Eighth line segment
21 Boundary Line between Second Base and Third Base
22 Fourth power supply port
23 gap
24 Interdigital Structure
25 slits
26 First Reactance Element
27 Second reactance element
100 Communication module
101 Bluetooth Antenna
102 W-LAN antenna
103 Bluetooth System
104 W-LAN system

Claims

A ground plate, a radiating plate disposed opposite to the ground plate, and a shape of the radiating plate being point-symmetric with respect to a center point of the radiating plate, and a plurality of feed ports are provided on the radiating plate at arbitrary positions on the radiating plate. Is provided in a region of zero potential generated between the radiating plate and the ground plate, a base made of a dielectric or magnetic material or a mixture of a dielectric and a magnetic material is filled between the radiating plate and the ground plate. The value obtained by dividing the relative magnetic permeability of the substrate by the relative permittivity at an arbitrary point between the end of the radiation plate and the midpoint of the radiation plate on the connecting straight line changes, and is close to the end of the radiation plate on the straight line. The value obtained by dividing the relative permeability of the substrate in the region near the midpoint of the radiation plate by the relative permittivity is larger than the value obtained by dividing the relative permeability of the substrate in the region by the relative permittivity. An antenna device configured to be point-symmetric with respect to the midpoint of the antenna.

A ground plate, a radiating plate disposed opposite to the ground plate, and a plurality of feeding ports are provided in an area of zero potential generated on the radiating plate at an arbitrary position on the radiating plate, and the shape of the radiating plate is set to each of the feeding plates. It is symmetrical with respect to the straight line connecting the port and the radiation plate, and a base made of a dielectric or magnetic material or a mixture of a dielectric and a magnetic material is filled between the radiation plate and the ground plate. The value obtained by dividing the relative permeability of the substrate by the relative permittivity at an arbitrary point between the end of the radiation plate and the midpoint of the radiation plate on a straight line connecting the midpoints of the radiation plate changes. The value obtained by dividing the relative permeability of the substrate in the region near the midpoint of the radiation plate by the relative permittivity is larger than the value obtained by dividing the relative permeability of the substrate in the region near the end by the relative permittivity. A line is drawn between the base and the straight line connecting each feed port and the midpoint of the radiation plate. Configured antenna device such that the universal.

The electrical length from the end of one radiating plate to the end of the other radiating plate on a circular radiating plate having a diameter of approximately 電気 wavelength and a straight line connecting each feeding port and the midpoint of the radiating plate. 2. The antenna device according to claim 1, wherein the antenna device is constituted by a radiation plate of a regular polygonal shape having substantially a half wavelength.

From the end of one radiating plate to the other on an elliptical radiating plate or a straight line connecting each feeding port and the midpoint of the radiating plate, where the electrical length of each of the major axis and the minor axis is approximately 波長 wavelength of the desired frequency. 3. The antenna device according to claim 2, wherein the radiation length of the radiation plate is a rectangular radiation plate other than a regular polygon having an electrical length of approximately まで wavelength.

The relative permeability of the substrate between the ground plate and the radiation plate was divided by the relative dielectric constant at a position approximately 1/8 of the electrical length from the end of the radiation plate on the straight line connecting each feed port and the midpoint of the radiation plate. The antenna device according to claim 3 or 4, wherein the value is increased.

A circular radiation plate having a diameter of [1 + 0.5 × n (n is an integer equal to or greater than 0)] and an end of one radiation plate on a straight line connecting each feeding port and the midpoint of the radiation plate. 2. The antenna device according to claim 1, wherein the antenna device is configured by a regular polygonal radiation plate having a wavelength from [1] to an end of the other radiation plate of approximately [1 + 0.5 × n (n is an integer of 0 or more)].

An elliptical radiating plate or a feeding port or an intermediate point of the radiating plate in which the electrical length of each of the major axis and the minor axis is approximately [1 + 0.5 × n (n is an integer equal to or greater than 0)] at the desired frequency. Radiation of a rectangular shape other than a regular polygon having an electric length of approximately [1 + 0.5 × n (n is an integer of 0 or more)] from the end of one radiation plate to the end of the other radiation plate on a straight line. 3. The antenna device according to claim 2, wherein the antenna device is constituted by a plate.

On a straight line connecting each feeding port and the midpoint of the radiation plate, from the end of the radiation plate to an electrical length of approximately ／ + 2 × n / 4 (n is an integer of 0 or more) from the position of 波長 + 2 × n The value obtained by dividing the relative magnetic permeability of the substrate in the region up to / 4 (n is an integer of 0 or more) by the relative dielectric constant was smaller than the value obtained by dividing the relative magnetic permeability of the substrate in the other region by the relative dielectric constant. The antenna device according to claim 6.

3. The antenna device according to claim 1, wherein the radiation plate is provided with a first power supply port and a second power supply port, and straight lines connecting the respective power supply port positions and the midpoint of the radiation plate are orthogonal to each other. .

A first feed port, a second feed port, and a third feed port are provided on the radiating plate, and straight lines connecting the respective feeding port positions and the midpoint of the radiating plate cross each other at an angle of 60 degrees. Item 8. The antenna device according to item 7.

The antenna device according to claim 1, wherein the feed port is provided at an end of the radiation plate.

The antenna device according to claim 1 or 2, wherein the feed port is provided on a straight line connecting an arbitrary point at an end of the radiation plate and a middle point of the radiation plate.

3. The antenna device according to claim 1, wherein the feed port is connected to the radiation plate via a gap.

14. The antenna device according to claim 13, wherein the shape of the feed port and the radiation plate facing the gap has an interdigital structure.

The antenna device according to claim 1, wherein a feed port is provided at a midpoint of the radiation plate.

3. The antenna device according to claim 1, wherein a resonance frequency of the radiation plate at a power supply port provided at a midpoint of the radiation plate is different from a resonance frequency of another power supply port.

On the straight line connecting the feed port and the midpoint of the radiating plate, the distance between the radiating plate and the ground plate changes from the end of the radiating plate to the midpoint of the radiating plate. 3. The antenna device according to claim 1, wherein a distance between the radiation plate at the midpoint and the ground plate is widened.

18. The distance between the radiation plate and the ground plate at a point having an electrical length of approximately 1/8 wavelength from an end of the radiation plate on a straight line connecting the feeding port and the midpoint of the radiation plate. Antenna device.

The cross section of the radiation plate is formed by a connection of the convex portions on a straight line connecting the feeding port and the midpoint of the radiation plate, and the peripheral portion of the radiation plate is a convex-shaped valley portion. The antenna device as described in the above.

19. The antenna device according to claim 18, wherein a cross-sectional shape of the radiating plate is formed by a series of convex portions having an electrical length of approximately 1/2 wavelength.

3. The cross section of the ground plate is formed by a series of concave portions on a straight line connecting the feeding port and the midpoint of the radiation plate, and the ground plate portion facing the peripheral portion of the radiation plate becomes a concave-shaped mountain portion. The antenna device according to claim 2.

22. The antenna device according to claim 21, wherein the cross-sectional shape of the radiating plate is formed by a series of concave shapes having an electrical length of approximately 1/2 wavelength.

3. The antenna device according to claim 1, wherein an arbitrary number of slits are provided at arbitrary positions in a peripheral portion of the radiation plate that are line-symmetric with respect to a line segment connecting the feeding port and the midpoint of the radiation plate.

3. The antenna device according to claim 1, wherein the feed port is formed of a conductive line, and the conductive line is formed at an arbitrary angle with respect to a ground plate.

Reactance element with open end or open end thereof at a position symmetrical with respect to the position of the power supply port with reference to the midpoint of the substantially circular radiation plate or the intersection of the diagonal lines of the substantially regular radiation plate The antenna device according to claim 1 or 2, further comprising a reactance element electrically connected to the ground plate.

26. The antenna device according to claim 25, wherein the isolation between the ports is adjusted by cutting off the tip of the reactance element whose tip is open.

The antenna device according to claim 1 or 2, wherein each power supply port is used for diversity communication.

3. The antenna device according to claim 1, wherein each power supply port is used for communication of a different system.

3. The power supply system according to claim 1, wherein the first power supply port is used for communication of the first system, and the second power supply port and the third power supply port are used for diversity communication of the second system. Antenna device.

The first power supply port is used for communication of the first system, and the second power supply port and the third power supply port are used for transmission and reception of the second system. Antenna device.