JP2004080607A

JP2004080607A - System and instrument for measuring antenna and portable radio equipment

Info

Publication number: JP2004080607A
Application number: JP2002240589A
Authority: JP
Inventors: Yoshihiro Kanezaki; 金崎　善宏; Takeya Nagano; 長野　健也; Shinobu Maeda; 前田　忍; Kenichi Yuasa; 湯浅　賢一
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2002-08-21
Filing date: 2002-08-21
Publication date: 2004-03-11

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument and system for measuring antenna by which the antenna characteristic of an antenna to be measured can be measured with high accuracy in an actually used state with a simple constitution. <P>SOLUTION: The antenna measuring instrument outputs a first frequency signal from a transmitter 1 and transmits the signal from a first antenna 3. Portable radio equipment 2 receives the first frequency signal through an antenna 4 to be measured, detects the receiving level of the signal by means of a radio section 5, and transmits the information on the receiving level from the antenna 4 after converting the information into a second frequency signal. The instrument receives the second frequency signal through a second antenna 8, and detects the receiving level of the signal by means of a receiver 9. At this time, the portable radio equipment 2 is rotationally driven by means of a turntable 7. A controller 10 obtains the information on the radiation directivity of the antenna 4 by obtaining the information on the receiving level of the first frequency signal at the antenna 4 to be measured from the information on rotational angle of the turntable 7, and the information on the receiving level of the second frequency signal obtained by means of the receiver 9. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、主に携帯無線装置などの無線装置に用いられる小型アンテナの特性を測定するアンテナ測定装置及びアンテナ測定システムに関する。
【０００２】
【従来の技術】
従来、携帯無線装置などの無線装置のアンテナ（以下、被測定アンテナ）の放射指向特性（放射パターン）を測定する方法として、測定アンテナに対して任意の方位角方向に回転可能なテーブル上に被測定アンテナを配置し、測定アンテナを一定の距離を隔てて配置し、テーブルの回転角度と測定アンテナの受信レベルを記録するシステムが用いられている。
【０００３】
図８は、従来のアンテナ測定システムの構成を示す図である。このアンテナ測定システムは、送信装置１０１と、送信アンテナである測定アンテナ１０３と、被測定アンテナ１０４を設置して回転させる回転台１０７と、レベル検出装置１２１と、制御装置１１０と、電波暗室１１１とを有して構成される。電波暗室１１１内には、測定アンテナ１０３と、被測定アンテナ１０４とを配置し、被測定アンテナ１０４とレベル検出装置１２１とを高周波ケーブルで接続して、回転台１０７により被測定アンテナ１０４を回転させながら測定を行うようになっている。
【０００４】
送信装置１０１は、測定者の指定によって所望の周波数信号を出力し、測定アンテナ１０３より信号電波を送信する。一方、測定アンテナ１０３より放射された信号電波を被測定アンテナ１０４で受信し、受信した高周波電力を高周波ケーブルによりレベル検出装置１２１へ伝送する。そして、レベル検出装置１２１により被測定アンテナ１０４での受信レベルを検出する。制御装置１１０は、レベル検出装置１２１からの受信レベルと、回転台１０７からの回転角度情報により、方位角ごとのアンテナ受信特性を得る。
【０００５】
携帯無線装置用アンテナのように、アンテナとそれを支持する筐体が波長に対して十分大きくない（半波長以下程度の）小型アンテナの測定においては、上記のようにアンテナの給電部に高周波ケーブルを接続すると、高周波ケーブルにより電磁界の乱れが発生し、測定精度が劣化する。この対策として、被測定アンテナに小型発振器を接続し、被測定アンテナから送信した電波を測定アンテナで受信することでアンテナ放射特性を測定する方法が用いられている（小型発振器方式）。
【０００６】
図９は、小型発振器方式のアンテナ測定システムの構成を示す図である。このアンテナ測定システムは、受信アンテナである測定アンテナ１０８と、被測定アンテナ１０４及び小型発振器１２２を備えた携帯無線装置１０２を設置して回転させる回転台１０７と、レベル検出装置１２１と、制御装置１１０と、電波暗室１１１とを有して構成される。電波暗室１１１内には、測定アンテナ１０８と、被測定アンテナ１０４が接続され小型発振器１２２を内蔵した携帯無線装置１０２とを配置し、回転台１０７により携帯無線装置１０２を回転させながら測定を行うようになっている。
【０００７】
小型発振器１２２は、被測定アンテナ１０４の送信周波数の信号を発生し、出力するものである。被測定アンテナ１０４は、小型発振器１２２に接続されており、前記送信周波数の信号電波を送信する。そして、測定アンテナ１０８により、被測定アンテナ１０４から送信された送信周波数の信号電波を受信する。レベル検出装置１２１は、測定アンテナ１０８にで受信した前記送信周波数の受信レベルを検出する。制御装置１１０は、レベル検出装置１２１からの受信レベルと、回転台１０７からの回転角度情報により、アンテナ放射特性を得る。しかし、この構成では、小型発振器１２２は周波数が高くなるほど大きさが増大し、被測定アンテナ１０４近傍の電磁界に影響を与えるため、小型発振器１２２の有無により測定結果が変化するという課題がある。
【０００８】
また、他の方法として、例えば、特開平４−１７８５６９号公報に示されるように、被測定アンテナの受信情報を音波に変換して電気的に絶縁して伝送し、アンテナ特性の測定を行う方法が提案されている（音波変換方式）。
【０００９】
上記のような携帯無線装置に搭載した小型アンテナの測定を行う場合は、小型アンテナの用途を考慮すると、アンテナ単体の放射特性よりも、携帯無線装置と組み合わされた実使用状態におけるアンテナ放射特性が重要である。実使用状態でのアンテナ放射特性の測定を行う場合、図９の小型発振器方式のアンテナ測定システムのように携帯無線装置の構成を変えることはできない。
【００１０】
ここで、携帯無線装置の送信特性については、携帯無線装置を出力レベル一定の送信状態に設定することで容易に測定できる。図１０は、携帯無線装置の送信特性を測定する測定システムの構成を示す図である。携帯無線装置１０２は、ハードウェア構成としても、ソフトウェア構成としても、実使用構成と同等の構成になっており、デバッグモードに設定することにより、被測定アンテナ１０４から一定電力の電波を送信するように設定されている。このような構成とすることで、携帯無線装置１０２の送信特性を容易に測定できる。
【００１１】
しかし、図１０の構成などにおいて、携帯無線装置のアンテナ受信特性を実使用状態で測定する場合、受信周波数を受信して得られた受信レベルを制御装置に伝送する手段として、制御線を接続する必要がある。この場合、制御線が被測定アンテナ近傍の電磁界に影響を及ぼすため、正確な測定は困難であった。
【００１２】
【発明が解決しようとする課題】
上述したように、従来のアンテナ測定システムでは、実使用状態でのアンテナ特性を測定する場合に、被測定アンテナの近傍に受信した高周波電力または受信レベル情報を伝送するケーブルが必要である。このケーブルによって被測定アンテナ近傍の電磁界が乱されるため、正確なアンテナ特性の測定が困難であるという問題点があった。
【００１３】
上記特開平４−１７８５６９号公報で記載されているような、携帯無線装置にスピーカと音波信号変換装置を設けた構成では、上記のような被測定アンテナ近傍の電磁界に影響を及ぼすものが存在しないので、実使用状態でのアンテナ特性を正確に測定することが可能である。しかしながら、音波信号変換装置などが必要であるため、システム構成が複雑化する問題点がある。
【００１４】
本発明は、上記事情に鑑みてなされたもので、その目的は、簡単な構成で実使用状態での被測定アンテナのアンテナ特性を高い精度で測定することが可能なアンテナ測定装置及びアンテナ測定システムを提供することにある。
【００１５】
【課題を解決するための手段】
本発明のアンテナ測定システムは、携帯無線装置と、アンテナ測定装置とを有し、前記携帯無線装置に設けられた被測定アンテナのアンテナ特性を測定するアンテナ測定システムであって、前記アンテナ測定装置は、前記携帯無線装置の受信周波数の信号である第１周波数信号を送信する送信アンテナと、前記携帯無線装置の送信周波数の信号である第２周波数信号を受信する受信アンテナと、前記第１周波数信号を発生する送信手段と、前記第２周波数信号の受信情報を得る受信手段とを備え、前記携帯無線装置は、前記被測定アンテナで受信した前記第１周波数信号の受信レベルを検出する受信レベル検出手段と、前記被測定アンテナにおける受信レベルの情報を前記受信周波数と異なる送信周波数の信号である第２周波数信号に変換して前記被測定アンテナより送信する信号変換送信手段とを備えたことを特徴とする。
【００１６】
上記構成により、アンテナ測定装置において検出した第２周波数信号の受信情報を基に、携帯無線装置の被測定アンテナにおける第１周波数信号の受信レベルの情報を得ることが可能となる。この構成では、高周波ケーブルや小型発振器などを被測定アンテナの近傍に設ける必要がないため、これらの影響で電磁界が乱れることを防止でき、携帯無線装置に搭載された被測定アンテナの実使用状態でのアンテナ受信特性やアンテナ放射特性などの小型アンテナのアンテナ特性を正確に精度良く測定して評価することが可能である。
【００１７】
本発明のアンテナ測定システムは、携帯無線装置と、アンテナ測定装置とを有し、前記携帯無線装置に設けられた被測定アンテナのアンテナ特性を測定するアンテナ測定システムであって、前記アンテナ測定装置は、前記携帯無線装置の受信周波数の信号である第１周波数信号を送信するとともに前記携帯無線装置の送信周波数の信号である第２周波数信号を受信する送受信アンテナと、前記第１周波数信号を発生する送信手段と、前記第２周波数信号の受信情報を得る受信手段と、前記送信手段及び前記送受信アンテナによる送信状態と前記受信手段及び前記送受信アンテナによる受信状態とを切り替える測定切り替え手段とを備え、前記携帯無線装置は、前記被測定アンテナで受信した前記第１周波数信号の受信レベルを検出する受信レベル検出手段と、前記被測定アンテナにおける受信レベルの情報を前記受信周波数と異なる送信周波数の信号である第２周波数信号に変換して前記被測定アンテナより送信する信号変換送信手段とを備えたことを特徴とする。
【００１８】
上記構成により、アンテナ測定装置において検出した第２周波数信号の受信情報を基に、携帯無線装置の被測定アンテナにおける第１周波数信号の受信レベルの情報を得ることが可能となる。このため、高周波ケーブルや小型発振器などの影響を受けることなく、携帯無線装置に搭載された被測定アンテナの実使用状態でのアンテナ特性を正確に精度良く測定して評価することが可能である。また、アンテナ測定装置において送信アンテナと受信アンテナを共通化して送受信を切り替える構成としたので、測定用に複数のアンテナを必要とせず、装置構成を簡略化でき、コスト低減が可能である。
【００１９】
また、前記携帯無線装置は、前記被測定アンテナの測定に関する所定の測定単位ごとに送信状態と受信状態とを切り替える送受信切替手段を備えたことを特徴とする。
【００２０】
上記構成によれば、例えば所定の測定単位として被測定アンテナの所定の回転角度ごとに、携帯無線装置の送受信を切り替えて交互に行うことで、第１周波数信号と第２周波数信号の周波数間隔が狭い場合においても、第２周波数信号の影響を受けることなく被測定アンテナにおける第１周波数信号の受信レベル情報を得ることが可能となる。なお、携帯無線装置における送受信の切り替えと、アンテナ測定装置における送受信の切り替えとを同時に行う構成とすることも可能である。
【００２１】
また、前記アンテナ測定装置は、前記送信手段として第１の通信方式による前記第１周波数信号を発生する第１通信方式送信手段を備えるとともに、前記受信手段として前記第１の通信方式と異なる第２の通信方式による前記第２周波数信号の受信情報を得る第２通信方式受信手段を備え、前記携帯無線装置は、前記受信レベル検出手段として前記被測定アンテナで受信した前記第１の通信方式による第１周波数信号の受信レベルを検出する第１通信方式受信手段を備えるとともに、前記信号変換送信手段として前記被測定アンテナにおける受信レベルの情報を前記第２の通信方式による第２周波数信号に変換して送信する第２通信方式送信手段を備えたことを特徴とする。
【００２２】
上記構成によれば、測定のための送信と受信とを異なる通信方式で行うことができ、第１周波数信号と第２周波数信号とで互いに影響を受けることなく、アンテナ特性を精度良く測定することが可能である。
【００２３】
また、前記アンテナ測定装置は、前記携帯無線装置からの第２周波数信号を分配する信号分配手段と、前記信号分配手段で分配された一方の信号を基に前記被測定アンテナにおける第２周波数信号の送信レベルを検出する送信レベル検出手段とを備え、前記受信手段は前記信号分配手段で分配された他方の信号を基に前記被測定アンテナにおける第１周波数信号の受信レベルの情報を得ることを特徴とする。
【００２４】
上記構成によれば、被測定アンテナにおける第１周波数信号の受信レベルの情報と第２周波数信号の送信レベルの情報とを同時に得ることが可能となり、測定時間を短縮することが可能である。
【００２５】
本発明のアンテナ測定システムは、携帯無線装置と、アンテナ測定装置とを有し、前記携帯無線装置に設けられた被測定アンテナのアンテナ特性を測定するアンテナ測定システムであって、前記アンテナ測定装置は、前記携帯無線装置の受信周波数の信号である第１周波数信号を送信する送信アンテナと、前記第１周波数信号を発生する送信手段と、前記携帯無線装置における受信情報を取得する情報取得手段とを備え、前記携帯無線装置は、前記被測定アンテナで受信した前記第１周波数信号の受信レベルを検出する受信レベル検出手段と、前記被測定アンテナにおける受信レベルの情報を記憶する記憶手段とを備えたことを特徴とする。
【００２６】
上記構成によれば、携帯無線装置が検出した被測定アンテナの受信レベルを装置内の記憶手段に格納するので、受信レベル情報を送信することなしに測定終了後に記憶手段から読み出して取得することができ、被測定アンテナの実使用状態でのアンテナ放射特性を、高周波ケーブルや小型発振器の影響を受けることなく正確に測定することが可能となる。また、アンテナ計測装置は、携帯無線装置との間で測定用信号の通信を行うためのアンテナの数が１つで済むため、構成を簡単にでき、コスト低減が可能である。
【００２７】
本発明のアンテナ測定装置は、携帯無線装置に設けられた被測定アンテナのアンテナ特性を測定するアンテナ測定システムのアンテナ測定装置であって、前記携帯無線装置の受信周波数の信号である第１周波数信号を送信する送信アンテナと、前記携帯無線装置の送信周波数の信号である第２周波数信号を受信する受信アンテナと、前記第１周波数信号を発生する送信手段と、前記第２周波数信号の受信情報を得る受信手段とを備え、前記受信手段は、前記携帯無線装置において検出された前記第１周波数信号の受信レベルの情報が前記送信周波数に変換されて送信された前記第２周波数信号を受信し、この第２周波数信号の受信情報を基に前記被測定アンテナにおける第１周波数信号の受信レベルの情報を得ることを特徴とする。
【００２８】
上記構成により、アンテナ測定装置において検出した第２周波数信号の受信情報を基に、携帯無線装置の被測定アンテナにおける第１周波数信号の受信レベルの情報を得ることが可能となる。このため、高周波ケーブルや小型発振器などの影響を受けることなく、携帯無線装置に搭載された被測定アンテナの実使用状態でのアンテナ特性を正確に精度良く測定して評価することが可能である。
【００２９】
本発明のアンテナ測定装置は、携帯無線装置に設けられた被測定アンテナのアンテナ特性を測定するアンテナ測定システムのアンテナ測定装置であって、前記携帯無線装置の受信周波数の信号である第１周波数信号を送信するとともに前記携帯無線装置の送信周波数の信号である第２周波数信号を受信する送受信アンテナと、前記第１周波数信号を発生する送信手段と、前記第２周波数信号の受信情報を得る受信手段と、前記送信手段及び前記送受信アンテナによる送信状態と前記受信手段及び前記送受信アンテナによる受信状態とを切り替える測定切り替え手段とを備え、前記受信手段は、前記携帯無線装置において検出された前記第１周波数信号の受信レベルの情報が前記送信周波数に変換されて送信された前記第２周波数信号を受信し、この第２周波数信号の受信情報を基に前記被測定アンテナにおける第１周波数信号の受信レベルの情報を得ることを特徴とする。
【００３０】
上記構成により、アンテナ測定装置において検出した第２周波数信号の受信情報を基に、携帯無線装置の被測定アンテナにおける第１周波数信号の受信レベルの情報を得ることが可能となり、高周波ケーブルや小型発振器などの影響を受けることなく、携帯無線装置に搭載された被測定アンテナの実使用状態でのアンテナ特性を正確に精度良く測定して評価することが可能である。また、送信アンテナと受信アンテナを共通化して送受信を切り替える構成としたので、測定用に複数のアンテナを設けることなく、装置構成を簡略化でき、コスト低減が可能である。
【００３１】
本発明の携帯無線装置は、アンテナ特性を測定するアンテナ測定システムにおける携帯無線装置であって、アンテナ測定装置から送信され被測定アンテナで受信した受信周波数の信号である第１周波数信号の受信レベルを検出する受信レベル検出手段と、前記被測定アンテナにおける受信レベルの情報を前記受信周波数と異なる送信周波数の信号である第２周波数信号に変換して前記被測定アンテナより送信する信号変換送信手段とを備えたことを特徴とする。
【００３２】
上記構成により、アンテナ測定装置において第２周波数信号を受信することで、第２周波数信号の受信情報を基に携帯無線装置の被測定アンテナにおける第１周波数信号の受信レベルの情報を得ることが可能となる。このため、被測定アンテナの近傍の電磁界が高周波ケーブルや小型発振器などの影響で乱されることなく、また、音波信号変換装置などを設けずに追加構成を少なくしつつ、携帯無線装置に搭載された被測定アンテナの実使用状態でのアンテナ特性を正確に精度良く測定して評価することが可能である。
【００３３】
また、前記被測定アンテナの測定に関する所定の測定単位ごとに送信状態と受信状態とを切り替える送受信切替手段を備えたことを特徴とする。
【００３４】
上記構成によれば、例えば所定の測定単位として被測定アンテナの所定の回転角度ごとに、携帯無線装置の送受信を切り替えて交互に行うことで、受信周波数と送信周波数の周波数間隔が狭い場合においても、アンテナ測定装置において第２周波数信号の影響を受けることなく被測定アンテナにおける第１周波数信号の受信レベル情報を得ることが可能となる。
【００３５】
また、前記受信レベル検出手段として前記被測定アンテナで受信した第１の通信方式による第１周波数信号の受信レベルを検出する第１通信方式受信手段を備えるとともに、前記信号変換送信手段として前記被測定アンテナにおける受信レベルの情報を前記第１の通信方式と異なる第２の通信方式による第２周波数信号に変換して送信する第２通信方式送信手段を備えたことを特徴とする。
【００３６】
上記構成によれば、測定のための送信と受信とを異なる通信方式で行うことができ、第１周波数信号と第２周波数信号とで互いに影響を受けることなく、アンテナ特性を精度良く測定することが可能である。
【００３７】
【発明の実施の形態】
以下、図面を参照して本発明の実施形態を説明する。
（第１実施形態）
図１は、本発明の第１実施形態に係るアンテナ測定システムの構成を示すブロック図である。本実施形態では、小型アンテナのアンテナ特性を測定するシステムとして、携帯電話機などの携帯無線装置のアンテナ測定システムの構成例を示す。
【００３８】
アンテナ測定システムは、アンテナ計測装置と携帯無線装置２とを含み、携帯無線装置２のアンテナ放射特性等を測定するものである。アンテナ計測装置は、送信手段としての送信装置１と、測定用アンテナの送信アンテナである第１アンテナ３と、携帯無線装置２を設置して回転させる回転台７と、測定用アンテナの受信アンテナである第２アンテナ８と、受信手段としての受信装置９と、制御部１０と、電波暗室１１とを有して構成される。携帯無線装置２は、ホイップアンテナなどの小型アンテナである被測定アンテナ４と、受信レベル検出手段及び信号変換送信手段を構成する無線部５及び端末制御部６とを備えて構成される。
【００３９】
電波暗室１１内には、第１アンテナ３と、回転台７と、第２アンテナ８とを配置し、回転台７上に携帯無線装置２を載置して、携帯無線装置２の被測定アンテナ４を回転させながら測定を行うようになっている。
【００４０】
アンテナ計測装置の送信装置１は、例えばシグナルジェネレータ（ＳＧ）であり、測定者が所望する周波数及び出力レベルの第１周波数信号を出力するものである。第１周波数信号は、携帯無線装置２の受信周波数の信号であり、例えば、周波数２１４０ＭＨｚのＷ−ＣＤＭＡ方式の変調信号波である。第１アンテナ３は、第１周波数信号を送信するアンテナであり、送信装置１と高周波ケーブル等で接続され、主放射方向を回転台７に載置された携帯無線装置２に搭載されている被測定アンテナ４に向けて固定されている。
【００４１】
携帯無線装置２の内部に設けられる無線部５は、被測定アンテナ４と電気的に接続されており、例えばＷ−ＣＤＭＡ方式の送信、受信、変復調を行うものである。この無線部５は、受信周波数の第１周波数信号を受信してその受信レベルを検出し、この検出された受信レベルの情報を送信周波数の第２周波数信号に変換して送信するようになっている。また、端末制御部６は、無線部５と電気的に接続されており、無線部５等の端末内の各部を制御するものである。
【００４２】
回転台７は、回転軸を中心に水平方向へ回転するものであり、その回転角度は最大３６０度で制御され、例えば、角度分解能は０．１度ないし５度程度とする。また、回転台７の１回転に要する時間は１５秒程度とする。この回転台７は、例えば樹脂や発泡スチロールなどの非金属材料で構成され、被測定アンテナ４から放射される電波を乱さない構成になっている。
【００４３】
第２アンテナ８は、携帯無線装置２が送信する第２周波数信号を受信するアンテナであり、主放射方向を回転台７に載置された携帯無線装置２の被測定アンテナ４に向けて固定されている。第２周波数信号は、携帯無線装置２の送信周波数の信号であり、例えば、周波数１９５０ＭＨｚのＷ−ＣＤＭＡ方式の変調信号波である。
【００４４】
受信装置９は、第２アンテナ８と高周波ケーブル等で接続され、第２周波数信号を復調するものである。制御装置１０は例えばパーソナルコンピュータで構成され、回転台７と受信装置９とに対して制御線で接続され、回転台７及び受信装置９の制御を行う。また、回転台７の回転角度情報と、受信装置９により復調された第２周波数信号の受信レベル情報とから、被測定アンテナ４のアンテナ放射特性データを作成する。
【００４５】
電波暗室１１は、室内の面に電波吸収体が貼り付けられており、室内の中央部分において定在波が存在しないクワイエット・ゾーンを構成し、アンテナ測定に適した環境を提供するものである。
【００４６】
このように構成されたアンテナ測定システムの動作について説明する。送信装置１より出力した測定用の第１周波数信号を第１アンテナ３から送信し、携帯無線装置２において、第１アンテナ３からの第１周波数信号を被測定アンテナ４で受信し、無線部５で受信レベルを検出する。そして、端末制御部６により無線部５を制御し、前記受信レベルの情報を第２周波数信号に変換して出力し、被測定アンテナ４から送信する。この送信された第２周波数信号は、第２アンテナ８によって受信され、受信装置９により復調されて受信レベルが検出される。また、回転台７は、携帯無線装置２を回転駆動すると共にそのときの回転角度情報を制御装置１０に伝送する。制御装置１０は、回転台７からの回転角度情報と、受信装置９で得られた受信レベル情報とにより、被測定アンテナ４のアンテナ放射指向性情報を得る。
【００４７】
本実施形態では、測定用の第１周波数信号を第１アンテナから送信して携帯無線装置で受信し、携帯無線装置において検出した受信レベルの情報を異なる周波数の第２周波数信号に変換して送信し、第２アンテナで携帯無線装置からの第２周波数信号を受信して受信レベル情報を得ることで、携帯無線装置の被測定アンテナの放射特性を得られるようになっている。これにより、従来のように高周波ケーブル及び小型発振器等の影響を受けることなく、アンテナ近傍の電磁界を乱さずに、携帯無線装置の実使用状態でのアンテナ受信特性やアンテナ放射特性などの小型アンテナのアンテナ特性を正確に精度良く測定して評価することができる。
【００４８】
（第２実施形態）
図２は、本発明の第２実施形態に係るアンテナ測定システムの構成を示すブロック図である。なお、図１に示した第１実施形態と同様の構成要素には、同一符号を付して説明を省略する。
【００４９】
第２実施形態のアンテナ測定システムは、アンテナ測定装置において測定切り替え手段である測定切り替え部１２を備えている。この測定切り替え部１２には、それぞれ高周波ケーブルによって、一方に測定用アンテナである送受信アンテナ１３が接続され、他方に送信装置１と受信装置９とが切換可能に接続されている。送受信アンテナ１３は、携帯無線装置２の被測定アンテナ４へ測定用の第１周波数信号を送信するとともに、携帯無線装置２の被測定アンテナ４からの第２周波数信号を受信するアンテナであり、主放射方向を携帯無線装置２に搭載されている被測定アンテナ４に向けて固定されている。
【００５０】
このように構成されたアンテナ測定システムの動作について説明する。測定切り替え部１２は、送信装置１と送受信アンテナ１３とを接続した状態と、送受信アンテナ１３と受信装置９とを接続した状態を交互に切り替えることができる。まず、測定切り替え部１２によって送信装置１と送受信アンテナ１３とを接続した状態において、送信装置１より測定用の第１周波数信号を出力して送受信アンテナ１３から送信し、携帯無線装置２において、第１アンテナ３からの第１周波数信号を被測定アンテナ４で受信し、無線部５で受信レベルを検出する。そして、無線部５によって受信レベル情報を第２周波数信号に変換して出力し、被測定アンテナ４から送信する。
【００５１】
次に、測定切り替え部１２によって接続状態を切り替えて送受信アンテナ１３と受信装置９とを接続した状態にする。この状態において、携帯無線装置２からの第２周波数信号を送受信アンテナ１３で受信し、受信装置９に入力して復調を行い、受信レベルを検出する。回転台７は、携帯無線装置２を回転駆動すると共にそのときの回転角度情報を制御装置１０に伝送する。制御装置１０は、回転台７からの回転角度情報と、受信装置９で得られた受信レベル情報とにより、被測定アンテナ４のアンテナ放射指向性情報を得る。例えば、１０°の角度分解能でアンテナ放射特性を得る場合には、回転台７が１回転する間に測定切り替え部１２を７２回切り替えるようにする。
【００５２】
第２実施形態では、第１実施形態と同様の測定を行うアンテナ測定システムにおいて、送信アンテナと受信アンテナを共通化し、計測切り替え部により送受信を切り替える構成としている。これにより、測定用に複数のアンテナを設けることなく、装置構成を簡略化でき、コスト低減が可能である。
【００５３】
（第３実施形態）
図３は、本発明の第３実施形態に係るアンテナ測定システムの構成を示すブロック図である。なお、図１に示した第１実施形態と同様の構成要素には、同一符号を付して説明を省略する。
【００５４】
第３実施形態のアンテナ測定システムは、携帯無線装置２の端末制御部６において、送受信切替手段としての送受信切替部１４を備えている。この送受信切替部１４によって無線部５に対して動作制御を行い、送信状態と受信状態とを排他的に切り替えるようになっている。
【００５５】
このように構成されたアンテナ測定システムの動作について説明する。まず、携帯無線装置２は、送受信切替部１４により受信状態を選択し、無線部５を受信状態にする。この状態において、無線部５によって第１アンテナ３から送信され被測定アンテナ４で受信した第１周波数信号を受信し、その受信レベルを検出する。その後、送受信切替部１４により送信状態を選択して無線部５を送信状態に切り替える。この状態において、無線部５によって前記受信レベルの情報を第２周波数信号に変換して出力し、被測定アンテナ４から送信する。そして、送信された第２周波数信号は第２アンテナ８で受信され、受信装置９により復調されて受信レベルが検出される。また、回転台７は、携帯無線装置２を回転駆動すると共にそのときの回転角度情報を制御装置１０に伝送する。制御装置１０は、回転台７からの回転角度情報と、受信装置９で得られた受信レベル情報とにより、被測定アンテナ４のアンテナ放射指向性情報を得る。例えば、１０°の角度分解能でアンテナ放射特性を得る場合には、回転台７が１回転する間に送受信切替部１４により送受信状態を７２回切り替えるようにする。
【００５６】
第３実施形態では、送受信切替部１４によって送受信状態を選択することにより、電波暗室１１内において同一時間に使用される周波数信号は、第１周波数信号または第２周波数信号のいずれか一方となる。それゆえ、例えばＰＨＳ方式などのように、送受信の周波数間隔が狭い場合においても、第１周波数信号と第２周波数信号とで互いに影響を受けることなく、受信レベルを精度良く測定することができる。
【００５７】
（第４実施形態）
図４は、本発明の第４実施形態に係るアンテナ測定システムの構成を示すブロック図である。なお、図２及び図３に示した第２及び第３実施形態と同様の構成要素には、同一符号を付して説明を省略する。
【００５８】
第４実施形態は、第２実施形態のアンテナ測定システムにおいて、第３実施形態と同様に携帯無線装置２の端末制御部６に送受信切替部１４を設けた構成である。
【００５９】
この第４実施形態では、測定切り替え部１２によって送受信アンテナ１３の接続を切り替えてアンテナ測定装置の送信系と受信系とを切り替えるとともに、送受信切替部１４によって携帯無線装置２の無線部６の動作を切り替えて送信状態と受信状態とを切り替えるようにする。
【００６０】
第４実施形態によれば、測定用の送信アンテナと受信アンテナとを共通化することによって装置構成を簡略化できるとともに、電波暗室内において第１周波数信号と第２周波数信号とが混在しないようにできるため、送受信の周波数間隔が狭い場合においてもアンテナ特性を精度良く測定することができる。
【００６１】
（第５実施形態）
図５は、本発明の第５実施形態に係るアンテナ測定システムの構成を示すブロック図である。なお、図１に示した第１実施形態と同様の構成要素には、同一符号を付して説明を省略する。
【００６２】
第５実施形態のアンテナ測定システムは、携帯無線装置２において、アンテナ共用器１５と、第１通信方式受信手段として機能する第１無線部１６と、第２通信方式送信手段として機能する第２無線部１７と、通信方式制御部１８とを備えている。
【００６３】
アンテナ共用器１５は、第１通信方式と第２通信方式とでアンテナを共用するためのものであり、被測定アンテナ４と高周波伝送路で接続されている。また、アンテナ共用器１５は、第１無線部１６及び第２無線部１７ともそれぞれ高周波伝送路で接続されている。第１無線部１６は、第１通信方式の送信、受信、変復調を行うものであり、第２無線部１７は、第２通信方式の送信、受信、変復調を行うものである。これらの第１無線部１６及び第２無線部１７は、通信方式制御部１８と電気的に接続されている。通信方式制御部１８は、第１無線部１６及び第２無線部１７を制御するものであり、制御信号を送ることで第１無線部１６及び第２無線部１７の動作制御を行う。なお、通信方式それぞれに専用のアンテナを設けてもよい。
【００６４】
このように構成されたアンテナ測定システムの動作について説明する。送信装置１は、第１通信方式送信手段として機能するもので、第１通信方式の受信周波数である第１周波数信号を出力し、第１アンテナ３より第１周波数信号を送信する。携帯無線装置２において、被測定アンテナ４で第１周波数信号を受信し、通信方式制御部１８の受信制御に基づき、第１無線部１６により第１周波数信号の受信レベルを検出する。そして、通信方式制御部１８の送信制御に基づき、第２無線部１７により前記受信レベルの情報を第２通信方式の送信周波数である第２周波数信号に変換して出力し、被測定アンテナ４から送信する。
【００６５】
携帯無線装置２より送信された第２周波数信号は、第２アンテナ８によって受信されて高周波ケーブルを介して受信装置９に送られる。受信装置９は、第２通信方式受信手段として機能するもので、第２周波数信号を復調して受信レベルを検出する。制御装置１０は、回転台７からの回転角度情報と、受信装置９で得られた受信レベル情報とにより、被測定アンテナ４のアンテナ放射指向性情報を得る。
【００６６】
このように本実施形態では、測定のための送信と受信とを異なる通信方式で行うことができ、アンテナ特性を精度良く測定することができる。第１通信方式及び第２通信方式の例としては、第１通信方式としてＰＤＣ方式などの移動体通信方式の無線部を設け、第２通信方式としてＢｌｕｅｔｏｏｔｈ　やＩｒＤＡなどの近距離無線方式の無線部を搭載した携帯無線装置、ＰＤＣ方式とＰＨＳ方式の両方式の無線部を搭載した携帯無線装置、ＰＤＣ方式８００ＭＨｚとＰＤＣ方式１．５ＧＨｚの無線部を搭載した携帯無線装置、Ｗ−ＣＤＭＡ方式とＰＤＣ方式の無線部を搭載した携帯無線装置、Ｗ−ＣＤＭＡ方式とＧＳＭ方式の無線部を搭載した携帯無線装置などが挙げられる。
【００６７】
（第６実施形態）
図６は、本発明の第６実施形態に係るアンテナ測定システムの構成を示すブロック図である。なお、図１に示した第１実施形態と同様の構成要素には、同一符号を付して説明を省略する。
【００６８】
第６実施形態のアンテナ測定システムは、アンテナ測定装置において、第２アンテナ８に接続される信号分配手段としての高周波分配器１９と、受信装置９と、送信レベル検出手段として機能するレベル検出装置２０とを備え、高周波分配器１９の出力端に受信装置９及びレベル検出装置２０が接続されている。高周波分配器１９は、第２アンテナ８によって受信した第２周波数信号を受信装置９とレベル検出装置２０とに分配出力する。受信装置９は、入力された受信信号を復調して制御部１０に出力する。レベル検出装置２０は、入力された受信信号の信号レベルを検出し、制御部１０に出力する。
【００６９】
このように構成されたアンテナ測定システムの動作について説明する。本実施形態では、携帯無線装置２は、測定者によってあらかじめ一定の送信電力で第２周波数信号を送信するように設定されているものとする。
【００７０】
第２アンテナ８で受信した携帯無線装置２からの第２周波数信号は、高周波ケーブルを介して高周波分配器１９に入力され、高周波分配器１９は、第２周波数信号を第３周波数信号と第４周波数信号とに２分配する。この第３周波数信号及び第４周波数信号の信号レベルは、第２周波数信号の信号レベルよりそれぞれ３［ｄＢ］（実際は、高周波分配器１９の通過損失を含むため３＋ｎ［ｄＢ］）小さい信号となる。
【００７１】
受信装置９は、第３周波数信号を復調し、これにより第１周波数信号の受信レベル情報を検出して、この受信レベル情報を制御装置１０に出力する。一方、レベル検出装置２０は、第４周波数信号の信号レベルを検出し、この信号レベルに３ｄＢを加えて第２周波数信号の信号レベルを算出し、この信号レベルに基づく送信レベル情報を制御装置１０に出力する。
【００７２】
制御装置１０は、受信装置９からの第１周波数信号の受信レベル情報と回転台７からの回転角度情報とから、被測定アンテナ４の第１周波数信号の周波数に対するアンテナ放射指向性情報、すなわちアンテナ受信特性を得る。また、レベル検出装置２０からの第２周波数信号の送信レベル情報と回転台７からの回転角度情報とから、被測定アンテナ４の第２周波数信号の周波数に対するアンテナ放射指向性情報、すなわちアンテナ送信特性を得る。
【００７３】
この第６実施形態では、回転台７が１回転する間に、第１周波数信号と第２周波数信号の２つの周波数に対する被測定アンテナ４のアンテナ特性を同時に得ることができる。このため、測定時間を短縮できる。
【００７４】
なお、図２及び図４に記載の構成において、測定切り替え部１２と受信装置９との間に高周波分配器１９を挿入して、高周波分配器１９にレベル検出装置２０を接続し、第３周波数信号の受信レベルを受信装置９で検出するとともに、第４周波数信号の信号レベルをレベル検出装置２０で検出するような変形例も可能である。これにより、携帯無線装置２との間で測定用信号の送受信を行うためのアンテナの数を１つにでき、構成を簡略化できる。
【００７５】
（第７実施形態）
図７は、本発明の第７実施形態に係るアンテナ測定システムの構成を示すブロック図である。なお、図１に示した第１実施形態と同様の構成要素には、同一符号を付して説明を省略する。
【００７６】
第７実施形態のアンテナ測定システムは、携帯無線装置２において記憶部１９を備えている。記憶部１９は、端末制御部６と電気的に接続されて制御され、データの読み出し、書き込みを行うものである。
【００７７】
このように構成されたアンテナ測定システムの動作について説明する。携帯無線装置２は、被測定アンテナ４で第１アンテナ３からの第１周波数信号を受信し、無線部５により受信レベルを検出する。端末制御部６は、無線部５及び記憶部１９を制御し、無線部５で検出された受信レベルの情報を記憶部１９に格納する。このとき、回転台７は、回転角度情報を制御装置１０に伝送する。そして、回転台７が一回転した後、携帯無線装置２と制御装置１０とを制御線で接続する。
【００７８】
制御装置１０は、情報取得手段として機能するもので、携帯無線装置２の端末制御部６を制御し、記憶部１９に格納されている受信レベル情報を取得する。そして、制御装置１０は、回転台７からの回転角度情報と、携帯無線装置２からの受信レベル情報とにより、被測定アンテナ４のアンテナ放射指向性情報を得る。例えば、記憶部１９に受信レベル情報を格納する時間間隔を、回転台７が１回転する間に７２回程度以上とすれば、１０°以下の角度分解能でアンテナ放射特性が得られる。
【００７９】
ここで、受信レベル情報と回転角度情報との同期をとるため、制御装置１０により送信装置１の出力をある瞬間において無出力から一定出力レベルへと変化させ、携帯無線装置２で測定される受信レベルに不連続な変化を与える。この不連続点における回転角度情報は、制御装置１０により特定できるため、結果として受信レベル情報と位相情報との同期を取ることができる。
【００８０】
第７実施形態では、被測定アンテナにおける受信レベルの情報を一旦携帯無線装置内部に記憶しておき、測定の終了後に受信レベル情報を読み出すようにしている。これにより、携帯無線装置に搭載された被測定アンテナの実使用状態でのアンテナ放射特性を、高周波ケーブル及び小型発振器の影響を受けることなく正確に測定することができる。更に、アンテナ計測装置において、携帯無線装置との間で測定用信号の通信を行うためのアンテナの数が１つで済むため、構成を簡単にでき、コスト低減が可能である。
【００８１】
なお、本発明は上述した実施形態に何ら限定されるものではなく、その要旨を逸脱しない範囲において種々の態様で実施し得るものである。
【００８２】
【発明の効果】
以上説明したように本発明によれば、簡単な構成で実使用状態での被測定アンテナのアンテナ特性を高い精度で測定することが可能なアンテナ測定装置及びアンテナ測定システムを提供できる。
【図面の簡単な説明】
【図１】本発明の第１実施形態に係るアンテナ測定システムの構成を示すブロック図
【図２】本発明の第２実施形態に係るアンテナ測定システムの構成を示すブロック図
【図３】本発明の第３実施形態に係るアンテナ測定システムの構成を示すブロック図
【図４】本発明の第４実施形態に係るアンテナ測定システムの構成を示すブロック図
【図５】本発明の第５実施形態に係るアンテナ測定システムの構成を示すブロック図
【図６】本発明の第６実施形態に係るアンテナ測定システムの構成を示すブロック図
【図７】本発明の第７実施形態に係るアンテナ測定システムの構成を示すブロック図
【図８】従来のアンテナ測定システムの構成を示すブロック図
【図９】小型発振器方式のアンテナ測定システムの構成を示すブロック図
【図１０】携帯無線装置の送信特性を測定する測定システムの構成を示すブロック図
【符号の説明】
１　送信装置
２　携帯無線装置
３　第１アンテナ
４　被測定アンテナ
５　無線部
６　端末制御部
７　回転台
８　第２アンテナ
９　受信装置
１０　制御装置
１１　電波暗室
１２　測定切り替え部
１３　送受信アンテナ
１４　送受信切替部
１６　第１無線部
１７　第２無線部
１８　通信方式制御部
１９　高周波分配器
２０　レベル検出装置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an antenna measuring device and an antenna measuring system for measuring characteristics of a small antenna mainly used for a wireless device such as a portable wireless device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a method of measuring the radiation directivity characteristic (radiation pattern) of an antenna of a wireless device such as a portable wireless device (hereinafter referred to as an antenna to be measured), the antenna is mounted on a table rotatable in an arbitrary azimuth direction with respect to the measurement antenna. A system is used in which a measurement antenna is arranged, the measurement antennas are arranged at a fixed distance, and the rotation angle of the table and the reception level of the measurement antenna are recorded.
[0003]
FIG. 8 is a diagram showing a configuration of a conventional antenna measurement system. This antenna measuring system includes a transmitting device 101, a measuring antenna 103 as a transmitting antenna, a turntable 107 for installing and rotating the antenna under test 104, a level detecting device 121, a control device 110, an anechoic chamber 111, It is comprised having. In the anechoic chamber 111, a measurement antenna 103 and a measured antenna 104 are arranged, the measured antenna 104 and the level detection device 121 are connected by a high frequency cable, and the measured antenna 104 is rotated by a turntable 107. It is designed to measure while.
[0004]
The transmitting apparatus 101 outputs a desired frequency signal in accordance with the designation of the measurer, and transmits a signal radio wave from the measuring antenna 103. On the other hand, a signal radio wave radiated from the measurement antenna 103 is received by the antenna under measurement 104, and the received high-frequency power is transmitted to the level detection device 121 by a high-frequency cable. Then, the reception level at the measured antenna 104 is detected by the level detection device 121. Control device 110 obtains antenna reception characteristics for each azimuth angle based on the reception level from level detection device 121 and the rotation angle information from turntable 107.
[0005]
In the measurement of a small antenna such as an antenna for a portable wireless device, in which the antenna and the casing supporting the antenna are not sufficiently large with respect to the wavelength (about half a wavelength or less), as described above, the high-frequency cable is connected to the feeding portion of the antenna as described above. Is connected, the electromagnetic field is disturbed by the high-frequency cable, and the measurement accuracy is deteriorated. As a countermeasure, a method is used in which a small oscillator is connected to the antenna to be measured, and the radio wave transmitted from the antenna to be measured is received by the measurement antenna to measure the radiation characteristics of the antenna (small oscillator method).
[0006]
FIG. 9 is a diagram showing the configuration of a small oscillator type antenna measurement system. The antenna measurement system includes a measurement antenna 108 as a reception antenna, a turntable 107 for installing and rotating the portable wireless device 102 including the antenna under test 104 and the small oscillator 122, a level detection device 121, and a control device 110 And an anechoic chamber 111. In the anechoic chamber 111, a measurement antenna 108 and a portable wireless device 102 connected to the antenna under test 104 and having a built-in small oscillator 122 are arranged, and measurement is performed while rotating the portable wireless device 102 by the turntable 107. It has become.
[0007]
The small oscillator 122 generates and outputs a signal of the transmission frequency of the antenna under measurement 104. The antenna under test 104 is connected to the small oscillator 122 and transmits a signal radio wave of the transmission frequency. Then, the measurement antenna 108 receives the signal radio wave of the transmission frequency transmitted from the antenna 104 to be measured. The level detection device 121 detects a reception level of the transmission frequency received by the measurement antenna 108. Control device 110 obtains antenna radiation characteristics based on the reception level from level detection device 121 and rotation angle information from turntable 107. However, in this configuration, the size of the small oscillator 122 increases as the frequency increases, and affects the electromagnetic field in the vicinity of the antenna 104 to be measured. Therefore, there is a problem that the measurement result changes depending on the presence or absence of the small oscillator 122.
[0008]
Further, as another method, for example, as disclosed in Japanese Patent Application Laid-Open No. 4-178569, a method of converting reception information of an antenna to be measured into a sound wave, electrically insulating and transmitting the sound wave, and measuring antenna characteristics. (Sound conversion method) has been proposed.
[0009]
When measuring a small antenna mounted on a portable radio device as described above, considering the use of the small antenna, the radiation characteristics of the antenna in the actual use state combined with the portable radio device are better than the radiation characteristics of the antenna alone. is important. When the antenna radiation characteristics are measured in an actual use state, the configuration of the portable wireless device cannot be changed as in the small oscillator type antenna measurement system of FIG.
[0010]
Here, the transmission characteristics of the portable wireless device can be easily measured by setting the portable wireless device to a transmission state in which the output level is constant. FIG. 10 is a diagram illustrating a configuration of a measurement system that measures transmission characteristics of the portable wireless device. The portable wireless device 102 has a hardware configuration and a software configuration equivalent to the actual use configuration. By setting the debug mode, the portable wireless device 102 transmits a radio wave of constant power from the antenna 104 to be measured. Is set to With such a configuration, the transmission characteristics of portable wireless device 102 can be easily measured.
[0011]
However, in the configuration of FIG. 10 and the like, when measuring the antenna reception characteristics of the portable wireless device in an actual use state, a control line is connected as a means for transmitting a reception level obtained by receiving a reception frequency to the control device. There is a need. In this case, since the control line affects the electromagnetic field near the antenna to be measured, accurate measurement has been difficult.
[0012]
[Problems to be solved by the invention]
As described above, the conventional antenna measurement system requires a cable for transmitting received high-frequency power or reception level information near the antenna to be measured when measuring antenna characteristics in an actual use state. Since the electromagnetic field near the antenna to be measured is disturbed by this cable, there is a problem that it is difficult to accurately measure the antenna characteristics.
[0013]
In a configuration in which a speaker and a sound wave signal conversion device are provided in a portable wireless device, as described in the above-mentioned Japanese Patent Application Laid-Open No. 4-178569, there is one that affects the electromagnetic field near the antenna to be measured as described above. Therefore, it is possible to accurately measure the antenna characteristics in the actual use state. However, there is a problem that the system configuration is complicated because a sound wave signal converter or the like is required.
[0014]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an antenna measuring apparatus and an antenna measuring system capable of measuring antenna characteristics of an antenna to be measured in a practical use state with high accuracy with a simple configuration. Is to provide.
[0015]
[Means for Solving the Problems]
An antenna measurement system according to an aspect of the invention includes a portable wireless device and an antenna measurement device, and is an antenna measurement system that measures antenna characteristics of an antenna to be measured provided in the portable wireless device. A transmitting antenna that transmits a first frequency signal that is a signal of a receiving frequency of the portable wireless device, a receiving antenna that receives a second frequency signal that is a signal of a transmitting frequency of the portable wireless device, and the first frequency signal And a reception unit for obtaining reception information of the second frequency signal, wherein the portable wireless device detects a reception level of the first frequency signal received by the antenna under measurement. Means for converting the information on the reception level at the antenna under measurement into a second frequency signal which is a signal having a transmission frequency different from the reception frequency. Characterized in that a signal conversion transmission means for transmitting from the antenna under test.
[0016]
According to the above configuration, it is possible to obtain information on the reception level of the first frequency signal at the measured antenna of the portable wireless device based on the reception information of the second frequency signal detected by the antenna measurement device. In this configuration, it is not necessary to provide a high-frequency cable or a small oscillator near the antenna to be measured, so that the electromagnetic field can be prevented from being disturbed by these effects, and the actual use of the antenna to be measured mounted on the portable wireless device can be prevented. It is possible to accurately and accurately measure and evaluate the antenna characteristics of a small antenna such as the antenna reception characteristics and the antenna radiation characteristics at the same time.
[0017]
An antenna measurement system according to an aspect of the invention includes a portable wireless device and an antenna measurement device, and is an antenna measurement system that measures antenna characteristics of an antenna to be measured provided in the portable wireless device. A transmitting / receiving antenna for transmitting a first frequency signal which is a signal of the receiving frequency of the portable wireless device and receiving a second frequency signal which is a signal of the transmitting frequency of the portable wireless device; and generating the first frequency signal. A transmitting unit, a receiving unit that obtains reception information of the second frequency signal, and a measurement switching unit that switches between a transmission state by the transmission unit and the transmission / reception antenna and a reception state by the reception unit and the reception / transmission antenna. The portable wireless device detects a reception level of the first frequency signal received by the antenna under measurement. Signal detecting means, and signal conversion transmitting means for converting information of the reception level at the antenna under measurement into a second frequency signal which is a signal having a transmission frequency different from the reception frequency and transmitting the signal from the antenna under measurement. It is characterized by.
[0018]
According to the above configuration, it is possible to obtain information on the reception level of the first frequency signal at the measured antenna of the portable wireless device based on the reception information of the second frequency signal detected by the antenna measurement device. Therefore, it is possible to accurately and accurately measure and evaluate the antenna characteristics of the antenna to be measured mounted on the portable wireless device in an actual use state without being affected by the high-frequency cable, the small oscillator, and the like. In addition, since the transmission and reception are switched by making the transmission antenna and the reception antenna common in the antenna measurement device, a plurality of antennas are not required for measurement, the device configuration can be simplified, and the cost can be reduced.
[0019]
Further, the portable wireless device includes transmission / reception switching means for switching between a transmission state and a reception state for each predetermined measurement unit related to the measurement of the antenna under measurement.
[0020]
According to the above configuration, for example, the transmission and reception of the portable wireless device are switched and performed alternately for each predetermined rotation angle of the antenna to be measured as a predetermined measurement unit, so that the frequency interval between the first frequency signal and the second frequency signal is changed. Even in a narrow case, the reception level information of the first frequency signal at the antenna under test can be obtained without being affected by the second frequency signal. Note that a configuration in which switching between transmission and reception in the portable wireless device and switching between transmission and reception in the antenna measurement device can be performed simultaneously is also possible.
[0021]
Further, the antenna measuring device includes a first communication system transmitting unit that generates the first frequency signal according to a first communication system as the transmitting unit, and a second communication system different from the first communication system as the receiving unit. A second communication system receiving unit that obtains reception information of the second frequency signal according to the communication system, wherein the portable wireless device uses the first communication system received by the antenna under measurement as the reception level detection unit. A first communication system receiving means for detecting a reception level of one frequency signal; and a signal conversion transmitting means for converting information of a reception level at the antenna under measurement into a second frequency signal according to the second communication method. It is characterized by comprising a second communication system transmitting means for transmitting.
[0022]
According to the above configuration, transmission and reception for measurement can be performed by different communication schemes, and antenna characteristics can be accurately measured without being affected by the first frequency signal and the second frequency signal. Is possible.
[0023]
The antenna measuring device may further include a signal distribution unit that distributes a second frequency signal from the portable wireless device, and a second frequency signal of the antenna under measurement based on one of the signals distributed by the signal distribution unit. Transmission level detection means for detecting a transmission level, wherein the reception means obtains information on the reception level of the first frequency signal at the antenna under measurement based on the other signal distributed by the signal distribution means. And
[0024]
According to the above configuration, it is possible to simultaneously obtain the information on the reception level of the first frequency signal and the information on the transmission level of the second frequency signal at the antenna under measurement, and it is possible to reduce the measurement time.
[0025]
An antenna measurement system according to an aspect of the invention includes a portable wireless device and an antenna measurement device, and is an antenna measurement system that measures antenna characteristics of an antenna to be measured provided in the portable wireless device. A transmitting antenna for transmitting a first frequency signal which is a signal of a receiving frequency of the portable wireless device, a transmitting unit for generating the first frequency signal, and an information acquiring unit for acquiring received information in the portable wireless device. The portable radio device includes: a reception level detection unit that detects a reception level of the first frequency signal received by the antenna under measurement; and a storage unit that stores information of the reception level at the antenna under measurement. It is characterized by the following.
[0026]
According to the above configuration, the reception level of the antenna under measurement detected by the portable wireless device is stored in the storage unit in the device, so that the reception level information can be read out from the storage unit and acquired after the measurement without transmitting the reception level information. This makes it possible to accurately measure the radiation characteristics of the antenna to be measured in the actual use state without being affected by a high-frequency cable or a small oscillator. Further, the antenna measurement device requires only one antenna for communicating the measurement signal with the portable wireless device, so that the configuration can be simplified and the cost can be reduced.
[0027]
An antenna measuring device of the present invention is an antenna measuring device of an antenna measuring system for measuring an antenna characteristic of an antenna to be measured provided in a portable wireless device, wherein the first frequency signal is a signal of a reception frequency of the portable wireless device. , A receiving antenna for receiving a second frequency signal which is a signal of the transmission frequency of the portable radio device, a transmitting means for generating the first frequency signal, and receiving information of the second frequency signal. Receiving means, wherein the receiving means receives the second frequency signal transmitted by converting the information of the reception level of the first frequency signal detected in the portable wireless device to the transmission frequency, The reception level information of the first frequency signal at the antenna under measurement is obtained based on the reception information of the second frequency signal.
[0028]
According to the above configuration, it is possible to obtain information on the reception level of the first frequency signal at the measured antenna of the portable wireless device based on the reception information of the second frequency signal detected by the antenna measurement device. Therefore, it is possible to accurately and accurately measure and evaluate the antenna characteristics of the antenna to be measured mounted on the portable wireless device in an actual use state without being affected by the high-frequency cable, the small oscillator, and the like.
[0029]
An antenna measuring device of the present invention is an antenna measuring device of an antenna measuring system for measuring an antenna characteristic of an antenna to be measured provided in a portable wireless device, wherein the first frequency signal is a signal of a reception frequency of the portable wireless device. Transmitting and receiving antenna for transmitting a second frequency signal which is a signal of the transmission frequency of the portable radio device, transmitting means for generating the first frequency signal, and receiving means for obtaining reception information of the second frequency signal And a measurement switching unit for switching between a transmission state by the transmitting unit and the transmitting and receiving antenna and a receiving state by the receiving unit and the transmitting and receiving antenna, wherein the receiving unit is configured to detect the first frequency detected by the portable wireless device. Receiving the second frequency signal transmitted by converting the signal reception level information to the transmission frequency; Wherein the received information of the second frequency signal based on; and obtaining information of the received level of the first frequency signal in the measurement antenna.
[0030]
According to the above configuration, it is possible to obtain information on the reception level of the first frequency signal at the antenna to be measured of the portable wireless device based on the reception information of the second frequency signal detected by the antenna measuring device, and it is possible to obtain a high-frequency cable It is possible to accurately and accurately measure and evaluate the antenna characteristics of the antenna to be measured mounted on the portable wireless device in an actual use state without being affected. Further, since transmission and reception are switched by sharing the transmission antenna and the reception antenna, the apparatus configuration can be simplified and the cost can be reduced without providing a plurality of antennas for measurement.
[0031]
A portable wireless device according to the present invention is a portable wireless device in an antenna measuring system for measuring antenna characteristics, wherein a reception level of a first frequency signal transmitted from the antenna measuring device and received by an antenna under measurement is received. Receiving level detecting means for detecting, and signal conversion transmitting means for converting information of the receiving level at the antenna under measurement into a second frequency signal which is a signal having a transmission frequency different from the receiving frequency and transmitting the signal from the antenna under measurement. It is characterized by having.
[0032]
According to the above configuration, by receiving the second frequency signal in the antenna measurement device, it is possible to obtain information on the reception level of the first frequency signal at the antenna to be measured of the portable wireless device based on the reception information of the second frequency signal. It becomes. For this reason, the electromagnetic field near the antenna to be measured is not disturbed by the influence of a high-frequency cable, a small oscillator, or the like. It is possible to accurately and accurately measure and evaluate the antenna characteristics of the measured antenna under actual use.
[0033]
Further, transmission / reception switching means for switching between a transmission state and a reception state for each predetermined measurement unit related to the measurement of the antenna under measurement is provided.
[0034]
According to the above configuration, for example, by switching the transmission and reception of the portable wireless device alternately for each predetermined rotation angle of the antenna to be measured as a predetermined measurement unit, even when the frequency interval between the reception frequency and the transmission frequency is narrow, Thus, it is possible to obtain the reception level information of the first frequency signal at the antenna to be measured without being affected by the second frequency signal in the antenna measurement device.
[0035]
In addition, the reception level detection means includes a first communication method reception means for detecting a reception level of a first frequency signal according to a first communication method received by the antenna under measurement, and the signal conversion transmission means includes the first communication method reception means. There is provided a second communication system transmitting means for converting the information of the reception level at the antenna into a second frequency signal based on a second communication system different from the first communication system and transmitting the second frequency signal.
[0036]
According to the above configuration, transmission and reception for measurement can be performed by different communication schemes, and antenna characteristics can be accurately measured without being affected by the first frequency signal and the second frequency signal. Is possible.
[0037]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1st Embodiment)
FIG. 1 is a block diagram showing the configuration of the antenna measurement system according to the first embodiment of the present invention. In the present embodiment, a configuration example of an antenna measurement system of a portable wireless device such as a mobile phone will be described as a system for measuring antenna characteristics of a small antenna.
[0038]
The antenna measurement system includes an antenna measurement device and the portable wireless device 2, and measures an antenna radiation characteristic and the like of the portable wireless device 2. The antenna measuring device includes a transmitting device 1 as a transmitting means, a first antenna 3 which is a transmitting antenna of a measuring antenna, a turntable 7 for installing and rotating the portable radio device 2, and a receiving antenna of the measuring antenna. It includes a certain second antenna 8, a receiving device 9 as receiving means, a control unit 10, and an anechoic chamber 11. The portable wireless device 2 includes an antenna under test 4 that is a small antenna such as a whip antenna, and a wireless unit 5 and a terminal control unit 6 that constitute a reception level detection unit and a signal conversion transmission unit.
[0039]
In the anechoic chamber 11, the first antenna 3, the turntable 7, and the second antenna 8 are arranged, and the portable wireless device 2 is placed on the turntable 7. The measurement is performed while rotating 4.
[0040]
The transmitting device 1 of the antenna measuring device is, for example, a signal generator (SG), and outputs a first frequency signal having a frequency and an output level desired by a measurer. The first frequency signal is a signal of the reception frequency of the portable wireless device 2, and is, for example, a W-CDMA modulated signal wave having a frequency of 2140 MHz. The first antenna 3 is an antenna that transmits a first frequency signal, is connected to the transmitting device 1 by a high-frequency cable or the like, and has a main radiation direction mounted on the portable wireless device 2 mounted on the turntable 7. It is fixed to the measurement antenna 4.
[0041]
A wireless unit 5 provided inside the portable wireless device 2 is electrically connected to the antenna 4 to be measured, and performs, for example, W-CDMA transmission, reception, and modulation / demodulation. The radio unit 5 receives the first frequency signal of the reception frequency, detects the reception level thereof, converts the information of the detected reception level into the second frequency signal of the transmission frequency, and transmits the signal. I have. The terminal control unit 6 is electrically connected to the wireless unit 5 and controls each unit in the terminal such as the wireless unit 5.
[0042]
The turntable 7 rotates in the horizontal direction about a rotation axis, and its rotation angle is controlled at a maximum of 360 degrees, and the angular resolution is, for example, about 0.1 to 5 degrees. The time required for one rotation of the turntable 7 is about 15 seconds. The turntable 7 is made of, for example, a non-metallic material such as resin or styrene foam, and is configured not to disturb the radio wave radiated from the antenna 4 to be measured.
[0043]
The second antenna 8 is an antenna that receives the second frequency signal transmitted by the portable wireless device 2, and has a main radiation direction fixed to the measured antenna 4 of the portable wireless device 2 mounted on the turntable 7. ing. The second frequency signal is a signal of the transmission frequency of the portable wireless device 2, and is, for example, a 1950 MHz frequency W-CDMA modulated signal wave.
[0044]
The receiving device 9 is connected to the second antenna 8 via a high-frequency cable or the like, and demodulates the second frequency signal. The control device 10 is composed of, for example, a personal computer, is connected to the turntable 7 and the receiving device 9 by control lines, and controls the turntable 7 and the receiving device 9. Further, antenna radiation characteristic data of the measured antenna 4 is created from the rotation angle information of the turntable 7 and the reception level information of the second frequency signal demodulated by the receiving device 9.
[0045]
The anechoic chamber 11 has a radio wave absorber attached to a surface of the room, forms a quiet zone in which no standing wave exists in a central portion of the room, and provides an environment suitable for antenna measurement.
[0046]
The operation of the antenna measurement system thus configured will be described. The first frequency signal for measurement output from the transmitting device 1 is transmitted from the first antenna 3, and the first frequency signal from the first antenna 3 is received by the antenna under measurement 4 in the portable wireless device 2, and the radio unit 5 To detect the reception level. Then, the radio control unit 5 is controlled by the terminal control unit 6, the reception level information is converted into a second frequency signal and output, and transmitted from the antenna 4 to be measured. The transmitted second frequency signal is received by the second antenna 8 and demodulated by the receiving device 9 to detect a reception level. In addition, the turntable 7 drives the portable wireless device 2 to rotate, and transmits rotation angle information at that time to the control device 10. The control device 10 obtains antenna radiation directivity information of the measured antenna 4 based on the rotation angle information from the turntable 7 and the reception level information obtained by the reception device 9.
[0047]
In the present embodiment, the first frequency signal for measurement is transmitted from the first antenna and received by the portable wireless device, and the information of the reception level detected by the portable wireless device is converted into a second frequency signal of a different frequency and transmitted. Then, the second antenna receives the second frequency signal from the portable wireless device and obtains reception level information, thereby obtaining the radiation characteristic of the measured antenna of the portable wireless device. As a result, a small antenna such as an antenna receiving characteristic and an antenna radiation characteristic in an actual use state of a portable wireless device can be obtained without being affected by a high-frequency cable and a small oscillator as in the related art and without disturbing an electromagnetic field near the antenna. Antenna characteristics can be accurately and accurately measured and evaluated.
[0048]
(2nd Embodiment)
FIG. 2 is a block diagram illustrating a configuration of the antenna measurement system according to the second embodiment of the present invention. The same components as those in the first embodiment shown in FIG.
[0049]
The antenna measurement system according to the second embodiment includes a measurement switching unit 12 that is a measurement switching unit in the antenna measurement device. A transmission / reception antenna 13 as a measurement antenna is connected to one of the measurement switching units 12 by a high-frequency cable, and the transmission device 1 and the reception device 9 are switchably connected to the other. The transmitting and receiving antenna 13 is an antenna that transmits a first frequency signal for measurement to the antenna 4 to be measured of the portable wireless device 2 and receives a second frequency signal from the antenna 4 to be measured of the portable wireless device 2. The radiation direction is fixed toward the measured antenna 4 mounted on the portable wireless device 2.
[0050]
The operation of the antenna measurement system thus configured will be described. The measurement switching unit 12 can alternately switch between a state in which the transmitting apparatus 1 and the transmitting / receiving antenna 13 are connected and a state in which the transmitting / receiving antenna 13 and the receiving apparatus 9 are connected. First, in a state where the transmitting apparatus 1 and the transmitting / receiving antenna 13 are connected by the measurement switching unit 12, the transmitting apparatus 1 outputs a first frequency signal for measurement and transmits the first frequency signal from the transmitting / receiving antenna 13; The first frequency signal from one antenna 3 is received by the antenna 4 to be measured, and the radio unit 5 detects the reception level. Then, the receiving unit 4 converts the reception level information into a second frequency signal by the radio unit 5 and outputs the second frequency signal.
[0051]
Next, the connection state is switched by the measurement switching unit 12 so that the transmission / reception antenna 13 and the reception device 9 are connected. In this state, the second frequency signal from the portable wireless device 2 is received by the transmitting / receiving antenna 13 and input to the receiving device 9 for demodulation to detect the reception level. The turntable 7 drives the portable wireless device 2 to rotate, and transmits rotation angle information at that time to the control device 10. The control device 10 obtains antenna radiation directivity information of the measured antenna 4 based on the rotation angle information from the turntable 7 and the reception level information obtained by the reception device 9. For example, when antenna radiation characteristics are obtained with an angular resolution of 10 °, the measurement switching unit 12 is switched 72 times while the turntable 7 makes one rotation.
[0052]
In the second embodiment, in the antenna measurement system that performs the same measurement as in the first embodiment, the transmission antenna and the reception antenna are shared, and the transmission and reception are switched by the measurement switching unit. Thus, the apparatus configuration can be simplified without providing a plurality of antennas for measurement, and the cost can be reduced.
[0053]
(Third embodiment)
FIG. 3 is a block diagram showing a configuration of the antenna measurement system according to the third embodiment of the present invention. The same components as those in the first embodiment shown in FIG.
[0054]
The antenna measurement system according to the third embodiment includes a transmission / reception switching unit 14 as a transmission / reception switching unit in the terminal control unit 6 of the portable wireless device 2. The transmission / reception switching unit 14 controls the operation of the radio unit 5 to exclusively switch between the transmission state and the reception state.
[0055]
The operation of the antenna measurement system thus configured will be described. First, the portable wireless device 2 selects the reception state by the transmission / reception switching unit 14 and sets the wireless unit 5 to the reception state. In this state, the first frequency signal transmitted from the first antenna 3 by the radio unit 5 and received by the antenna under measurement 4 is received, and the reception level is detected. After that, the transmission state is selected by the transmission / reception switching unit 14, and the wireless unit 5 is switched to the transmission state. In this state, the information of the reception level is converted into a second frequency signal by the radio unit 5 and output, and transmitted from the antenna 4 to be measured. Then, the transmitted second frequency signal is received by the second antenna 8 and demodulated by the receiving device 9 to detect a reception level. In addition, the turntable 7 drives the portable wireless device 2 to rotate, and transmits rotation angle information at that time to the control device 10. The control device 10 obtains antenna radiation directivity information of the measured antenna 4 based on the rotation angle information from the turntable 7 and the reception level information obtained by the reception device 9. For example, when antenna radiation characteristics are obtained with an angular resolution of 10 °, the transmission / reception switching unit 14 switches the transmission / reception state 72 times while the turntable 7 makes one rotation.
[0056]
In the third embodiment, the transmission / reception state is selected by the transmission / reception switching unit 14, so that the frequency signal used at the same time in the anechoic chamber 11 becomes either the first frequency signal or the second frequency signal. Therefore, even when the transmission and reception frequency intervals are narrow, such as in the PHS system, the reception level can be measured accurately without being affected by the first frequency signal and the second frequency signal.
[0057]
(Fourth embodiment)
FIG. 4 is a block diagram illustrating a configuration of an antenna measurement system according to a fourth embodiment of the present invention. Note that the same components as those in the second and third embodiments shown in FIGS. 2 and 3 are denoted by the same reference numerals and description thereof is omitted.
[0058]
The fourth embodiment has a configuration in which the transmission / reception switching unit 14 is provided in the terminal control unit 6 of the portable wireless device 2 as in the third embodiment, in the antenna measurement system of the second embodiment.
[0059]
In the fourth embodiment, the connection of the transmission / reception antenna 13 is switched by the measurement switching unit 12 to switch between the transmission system and the reception system of the antenna measurement device, and the operation of the radio unit 6 of the portable wireless device 2 is controlled by the transmission / reception switching unit 14. Switching between the transmission state and the reception state.
[0060]
According to the fourth embodiment, the configuration of the apparatus can be simplified by sharing the transmitting antenna and the receiving antenna for measurement, and the first frequency signal and the second frequency signal are not mixed in the anechoic chamber. Therefore, antenna characteristics can be measured with high accuracy even when the frequency interval between transmission and reception is narrow.
[0061]
(Fifth embodiment)
FIG. 5 is a block diagram illustrating a configuration of an antenna measurement system according to a fifth embodiment of the present invention. The same components as those in the first embodiment shown in FIG.
[0062]
The antenna measurement system according to the fifth embodiment includes an antenna duplexer 15, a first wireless unit 16 functioning as a first communication method receiving unit, and a second wireless unit functioning as a second communication method transmitting unit in the portable wireless device 2. And a communication system control unit 18.
[0063]
The antenna duplexer 15 is for sharing an antenna between the first communication system and the second communication system, and is connected to the antenna under test 4 via a high-frequency transmission line. The antenna duplexer 15 is also connected to the first wireless unit 16 and the second wireless unit 17 via high-frequency transmission lines. The first wireless unit 16 performs transmission, reception, and modulation / demodulation of the first communication method, and the second wireless unit 17 performs transmission, reception, and modulation / demodulation of the second communication method. The first wireless unit 16 and the second wireless unit 17 are electrically connected to the communication system control unit 18. The communication method control unit 18 controls the first wireless unit 16 and the second wireless unit 17, and controls the operation of the first wireless unit 16 and the second wireless unit 17 by sending a control signal. Note that a dedicated antenna may be provided for each communication system.
[0064]
The operation of the antenna measurement system thus configured will be described. The transmission device 1 functions as a first communication system transmission unit, outputs a first frequency signal that is a reception frequency of the first communication system, and transmits the first frequency signal from the first antenna 3. In the portable wireless device 2, the first frequency signal is received by the antenna under measurement 4, and the reception level of the first frequency signal is detected by the first wireless unit 16 based on the reception control of the communication system control unit 18. Then, based on the transmission control of the communication system control unit 18, the second radio unit 17 converts the information of the reception level into a second frequency signal which is the transmission frequency of the second communication system, and outputs the converted signal. Send.
[0065]
The second frequency signal transmitted from the portable wireless device 2 is received by the second antenna 8 and sent to the receiving device 9 via a high-frequency cable. The receiving device 9 functions as a second communication system receiving unit, and detects a reception level by demodulating the second frequency signal. The control device 10 obtains antenna radiation directivity information of the measured antenna 4 based on the rotation angle information from the turntable 7 and the reception level information obtained by the reception device 9.
[0066]
As described above, in the present embodiment, transmission and reception for measurement can be performed by different communication methods, and antenna characteristics can be accurately measured. As an example of the first communication system and the second communication system, a wireless unit of a mobile communication system such as a PDC system is provided as a first communication system, and a wireless unit of a short-range wireless system such as Bluetooth or IrDA is provided as a second communication system. , Portable wireless devices equipped with both PDC and PHS wireless units, portable wireless devices equipped with PDC 800 MHz and PDC 1.5 GHz wireless units, W-CDMA and PDC A portable wireless device equipped with a wireless unit of the W-CDMA system and a portable wireless device equipped with a wireless unit of the G-SM system are exemplified.
[0067]
(Sixth embodiment)
FIG. 6 is a block diagram showing the configuration of the antenna measurement system according to the sixth embodiment of the present invention. The same components as those in the first embodiment shown in FIG.
[0068]
The antenna measurement system according to the sixth embodiment includes an antenna measurement device, a high-frequency distributor 19 serving as a signal distribution unit connected to the second antenna 8, a reception device 9, and a level detection device 20 functioning as a transmission level detection unit. The receiving device 9 and the level detecting device 20 are connected to the output terminal of the high frequency distributor 19. The high-frequency distributor 19 distributes and outputs the second frequency signal received by the second antenna 8 to the receiving device 9 and the level detecting device 20. The receiving device 9 demodulates the input received signal and outputs it to the control unit 10. The level detection device 20 detects the signal level of the input received signal, and outputs the signal level to the control unit 10.
[0069]
The operation of the antenna measurement system thus configured will be described. In the present embodiment, it is assumed that the portable radio apparatus 2 is set in advance by the measurer so as to transmit the second frequency signal with a constant transmission power.
[0070]
The second frequency signal from the portable wireless device 2 received by the second antenna 8 is input to a high frequency distributor 19 via a high frequency cable, and the high frequency distributor 19 converts the second frequency signal into a third frequency signal and a fourth frequency signal. Frequency signal. The signal level of the third frequency signal and the signal level of the fourth frequency signal are respectively 3 [dB] smaller than the signal level of the second frequency signal (actually, 3 + n [dB] because of including the passage loss of the high frequency distributor 19). .
[0071]
The receiving device 9 demodulates the third frequency signal, thereby detecting reception level information of the first frequency signal, and outputs the reception level information to the control device 10. On the other hand, the level detection device 20 detects the signal level of the fourth frequency signal, calculates the signal level of the second frequency signal by adding 3 dB to the signal level, and transmits transmission level information based on the signal level to the control device 10. Output to
[0072]
The control device 10 uses the reception level information of the first frequency signal from the reception device 9 and the rotation angle information from the turntable 7 to determine the antenna radiation directivity information for the frequency of the first frequency signal of the antenna 4 to be measured, that is, the antenna Obtain reception characteristics. Also, based on the transmission level information of the second frequency signal from the level detector 20 and the rotation angle information from the turntable 7, antenna radiation directivity information for the frequency of the second frequency signal of the antenna 4 to be measured, that is, antenna transmission characteristics Get.
[0073]
In the sixth embodiment, while the turntable 7 makes one rotation, the antenna characteristics of the measured antenna 4 for the two frequencies of the first frequency signal and the second frequency signal can be obtained at the same time. Therefore, the measurement time can be reduced.
[0074]
In the configuration shown in FIGS. 2 and 4, a high-frequency distributor 19 is inserted between the measurement switching unit 12 and the receiving device 9, a level detector 20 is connected to the high-frequency distributor 19, and the third frequency A modification in which the reception level of the signal is detected by the reception device 9 and the signal level of the fourth frequency signal is detected by the level detection device 20 is also possible. Thereby, the number of antennas for transmitting and receiving the measurement signal to and from the portable wireless device 2 can be reduced to one, and the configuration can be simplified.
[0075]
(Seventh embodiment)
FIG. 7 is a block diagram illustrating a configuration of an antenna measurement system according to a seventh embodiment of the present invention. The same components as those in the first embodiment shown in FIG.
[0076]
The antenna measurement system according to the seventh embodiment includes a storage unit 19 in the portable wireless device 2. The storage unit 19 is electrically connected to and controlled by the terminal control unit 6, and reads and writes data.
[0077]
The operation of the antenna measurement system thus configured will be described. The portable wireless device 2 receives the first frequency signal from the first antenna 3 with the antenna under measurement 4 and detects the reception level with the wireless unit 5. The terminal control unit 6 controls the wireless unit 5 and the storage unit 19, and stores information on the reception level detected by the wireless unit 5 in the storage unit 19. At this time, the turntable 7 transmits the rotation angle information to the control device 10. Then, after the turntable 7 makes one rotation, the portable wireless device 2 and the control device 10 are connected by a control line.
[0078]
The control device 10 functions as an information acquisition unit, controls the terminal control unit 6 of the portable wireless device 2, and acquires the reception level information stored in the storage unit 19. Then, the control device 10 obtains the antenna radiation directivity information of the antenna 4 to be measured based on the rotation angle information from the turntable 7 and the reception level information from the portable wireless device 2. For example, if the time interval for storing the reception level information in the storage unit 19 is about 72 times or more during one rotation of the turntable 7, antenna radiation characteristics can be obtained with an angular resolution of 10 ° or less.
[0079]
Here, in order to synchronize the reception level information and the rotation angle information, the output of the transmission device 1 is changed from a no output to a constant output level at a certain moment by the control device 10, and the reception measured by the portable wireless device 2 is performed. Gives discontinuous changes to levels. Since the rotation angle information at the discontinuous point can be specified by the control device 10, as a result, the reception level information and the phase information can be synchronized.
[0080]
In the seventh embodiment, information on the reception level at the antenna under measurement is temporarily stored inside the portable wireless device, and the reception level information is read out after the measurement is completed. This makes it possible to accurately measure the antenna radiation characteristics of the antenna to be measured mounted on the portable wireless device in the actual use state without being affected by the high-frequency cable and the small oscillator. Furthermore, in the antenna measuring device, the number of antennas for communicating the measurement signal with the portable wireless device is one, so that the configuration can be simplified and the cost can be reduced.
[0081]
It should be noted that the present invention is not limited to the above-described embodiment at all, and can be implemented in various modes without departing from the gist thereof.
[0082]
【The invention's effect】
As described above, according to the present invention, it is possible to provide an antenna measuring apparatus and an antenna measuring system capable of measuring antenna characteristics of an antenna to be measured in a practical use state with high accuracy with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an antenna measurement system according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of an antenna measurement system according to a second embodiment of the present invention.
FIG. 3 is a block diagram showing a configuration of an antenna measurement system according to a third embodiment of the present invention.
FIG. 4 is a block diagram showing a configuration of an antenna measurement system according to a fourth embodiment of the present invention.
FIG. 5 is a block diagram showing a configuration of an antenna measurement system according to a fifth embodiment of the present invention.
FIG. 6 is a block diagram showing a configuration of an antenna measurement system according to a sixth embodiment of the present invention.
FIG. 7 is a block diagram showing a configuration of an antenna measurement system according to a seventh embodiment of the present invention.
FIG. 8 is a block diagram showing a configuration of a conventional antenna measurement system.
FIG. 9 is a block diagram showing a configuration of a small oscillator type antenna measurement system.
FIG. 10 is a block diagram illustrating a configuration of a measurement system that measures transmission characteristics of the portable wireless device.
[Explanation of symbols]
1 transmitting device
2 Portable wireless device
3 First antenna
4 Antenna to be measured
5 Radio section
6 Terminal control unit
7 Turntable
8 Second antenna
9 Receiver
10 Control device
11 Anechoic Chamber
12 Measurement switching unit
13 transmitting / receiving antenna
14 Transmission / reception switching unit
16 First wireless unit
17 Second wireless unit
18 Communication system control unit
19 High frequency distributor
20 level detector

Claims

An antenna measurement system that includes a portable wireless device and an antenna measuring device, and measures antenna characteristics of an antenna to be measured provided in the portable wireless device,
The antenna measuring device, a transmitting antenna that transmits a first frequency signal that is a signal of the receiving frequency of the portable wireless device, a receiving antenna that receives a second frequency signal that is a signal of the transmitting frequency of the portable wireless device, Transmitting means for generating the first frequency signal, and receiving means for obtaining received information of the second frequency signal,
The portable wireless device includes: a reception level detection unit configured to detect a reception level of the first frequency signal received by the antenna under measurement; and information of a reception level at the antenna under measurement by a signal having a transmission frequency different from the reception frequency. An antenna measurement system comprising: a signal conversion transmitting unit that converts the signal into a second frequency signal and transmits the signal from the antenna under measurement.

An antenna measurement system that includes a portable wireless device and an antenna measuring device, and measures antenna characteristics of an antenna to be measured provided in the portable wireless device,
A transmitting / receiving antenna that transmits a first frequency signal that is a signal of a reception frequency of the portable wireless device and receives a second frequency signal that is a signal of a transmission frequency of the portable wireless device; Transmitting means for generating a frequency signal, receiving means for obtaining reception information of the second frequency signal, and measurement switching means for switching between a transmitting state by the transmitting means and the transmitting / receiving antenna and a receiving state by the receiving means and the transmitting / receiving antenna With
The portable wireless device includes: a reception level detection unit configured to detect a reception level of the first frequency signal received by the antenna under measurement; and information of a reception level at the antenna under measurement by a signal having a transmission frequency different from the reception frequency. An antenna measurement system comprising: a signal conversion transmitting unit that converts the signal into a second frequency signal and transmits the signal from the antenna under measurement.

3. The antenna measurement system according to claim 1, wherein the portable wireless device includes a transmission / reception switching unit that switches between a transmission state and a reception state for each predetermined measurement unit related to the measurement of the antenna under measurement.

The antenna measuring apparatus includes a first communication system transmitting unit that generates the first frequency signal according to a first communication system as the transmitting unit, and a second communication different from the first communication system as the receiving unit. A second communication system receiving means for obtaining reception information of the second frequency signal by a system,
The portable wireless device includes, as the reception level detection unit, a first communication system reception unit that detects a reception level of a first frequency signal according to the first communication system received by the antenna under measurement, and the signal conversion transmission 3. The apparatus according to claim 1, further comprising a second communication system transmitting unit configured to convert information of a reception level at the antenna under measurement into a second frequency signal according to the second communication system and transmit the signal. Antenna measurement system.

The antenna measuring device includes: a signal distribution unit that distributes a second frequency signal from the portable wireless device; and a transmission level of the second frequency signal at the antenna under measurement based on one of the signals distributed by the signal distribution unit. Transmitting level detecting means for detecting the reception level of the first frequency signal at the antenna under measurement based on the other signal distributed by the signal distributing means. The antenna measurement system according to claim 1.

An antenna measurement system that includes a portable wireless device and an antenna measuring device, and measures antenna characteristics of an antenna to be measured provided in the portable wireless device,
The antenna measurement device is configured to transmit a first frequency signal that is a signal of a reception frequency of the portable wireless device, a transmitting unit that generates the first frequency signal, and acquire information received by the portable wireless device. Information acquisition means,
The portable wireless device includes: a reception level detection unit that detects a reception level of the first frequency signal received by the antenna under measurement; and a storage unit that stores information of a reception level at the antenna under measurement. Characteristic antenna measurement system.

An antenna measurement device for an antenna measurement system that measures antenna characteristics of an antenna to be measured provided in a portable wireless device,
A transmitting antenna that transmits a first frequency signal that is a signal of a receiving frequency of the portable wireless device, a receiving antenna that receives a second frequency signal that is a signal of a transmitting frequency of the portable wireless device, and the first frequency signal Transmitting means for generating, and receiving means for obtaining reception information of the second frequency signal,
The receiving means receives the second frequency signal transmitted by converting the information of the reception level of the first frequency signal detected in the portable wireless device into the transmission frequency, and receives the second frequency signal. An antenna measuring apparatus, wherein information on a reception level of a first frequency signal at the antenna under measurement is obtained based on the information.

An antenna measurement device for an antenna measurement system that measures antenna characteristics of an antenna to be measured provided in a portable wireless device,
A transmitting / receiving antenna for transmitting a first frequency signal which is a signal of a receiving frequency of the portable wireless device and receiving a second frequency signal which is a signal of a transmitting frequency of the portable wireless device, and transmitting for generating the first frequency signal Means, a receiving means for obtaining the reception information of the second frequency signal, and a measurement switching means for switching between a transmission state by the transmitting means and the transmitting and receiving antenna and a receiving state by the receiving means and the transmitting and receiving antenna,
The receiving means receives the second frequency signal transmitted by converting the information of the reception level of the first frequency signal detected in the portable wireless device into the transmission frequency, and receives the second frequency signal. An antenna measuring apparatus, wherein information on a reception level of a first frequency signal at the antenna under measurement is obtained based on the information.

A portable wireless device in an antenna measurement system that measures antenna characteristics,
Reception level detection means for detecting a reception level of a first frequency signal which is a signal of a reception frequency transmitted from the antenna measurement apparatus and received by the antenna under measurement, and transmitting information on the reception level at the antenna under measurement different from the reception frequency A portable radio apparatus, comprising: a signal conversion transmitting unit that converts the signal into a second frequency signal that is a frequency signal and transmits the signal from the antenna under measurement.

10. The portable wireless device according to claim 9, further comprising transmission / reception switching means for switching between a transmission state and a reception state for each predetermined measurement unit related to the measurement of the antenna under measurement.

A first communication method receiving means for detecting a reception level of a first frequency signal according to a first communication method received by the antenna under measurement as the reception level detecting means, and a signal conversion transmitting means in the antenna under measurement as the signal conversion transmitting means. 10. The portable device according to claim 9, further comprising a second communication system transmitting unit that converts reception level information into a second frequency signal according to a second communication system different from the first communication system and transmits the second frequency signal. Wireless device.