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JP4480655B2 - Method and apparatus for measuring unwanted wave component of transmission signal - Google Patents
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JP4480655B2 - Method and apparatus for measuring unwanted wave component of transmission signal - Google Patents

Method and apparatus for measuring unwanted wave component of transmission signal Download PDF

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JP4480655B2
JP4480655B2 JP2005289555A JP2005289555A JP4480655B2 JP 4480655 B2 JP4480655 B2 JP 4480655B2 JP 2005289555 A JP2005289555 A JP 2005289555A JP 2005289555 A JP2005289555 A JP 2005289555A JP 4480655 B2 JP4480655 B2 JP 4480655B2
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wave component
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unnecessary wave
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幸男 森口
俊彦 月岡
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NEC Network and Sensor Systems Ltd
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Description

本発明は送信信号の不要波成分測定方法及び測定装置に係り、特に大電力増幅器により電力増幅されて送信されるマイクロ波帯やミリ波帯の送信信号中の不要波成分を正確に測定する送信信号の不要波成分測定方法及び測定装置に関する。   The present invention relates to a method and an apparatus for measuring an unnecessary wave component of a transmission signal, and in particular, a transmission for accurately measuring an unnecessary wave component in a transmission signal of a microwave band or a millimeter wave band transmitted after being amplified by a high power amplifier. The present invention relates to a method and apparatus for measuring an unwanted wave component of a signal.

マイクロ波帯やミリ波帯の高周波信号を大電力増幅する大電力増幅器は従来から知られている(例えば、特許文献1参照)。この大電力増幅器は、電力用増幅器の出力側に接続された負荷より反射される電力を、電力増幅器と負荷の間に接続されているサーキュレータにより反射電力出力が電力用増幅器の出力に逆戻りするのを防ぐと共に、サーキュレータの反射電力出力端に接続されている終端器で反射電力を吸収消費する構成であり、更に、負荷からの反射電力を検波し、その検波電圧が一定のしきい値を越えたときに、電力増幅器から負荷に供給される大電力増幅信号を遮断させる検波回路を設けた構成である。   Conventionally, a high power amplifier that amplifies a high frequency signal in a microwave band or a millimeter wave band with a high power is known (see, for example, Patent Document 1). In this large power amplifier, the power reflected from the load connected to the output side of the power amplifier is returned to the output of the power amplifier by the circulator connected between the power amplifier and the load. In addition, the reflected power is absorbed and consumed by the terminator connected to the reflected power output terminal of the circulator, and the reflected power from the load is detected and the detected voltage exceeds a certain threshold. In this case, a detection circuit that cuts off the large power amplification signal supplied from the power amplifier to the load is provided.

上記のような大電力増幅器はマイクロ波帯やミリ波帯の信号を送信する送信局などに設けられ、送信すべき信号の基本周波数帯の電力増幅機能を有するが、その大電力増幅の際に微弱な不要波成分(高調波)を発生し、その不要波成分が他の機器に悪影響を与える。このため、遠方にまで送信するために大電力増幅器により大電力増幅されて送信されるマイクロ波帯やミリ波帯の信号の送受信システムでは、送信信号中の不要波成分のレベルが所定値以下となるように電波法で規定されている。   The high power amplifier as described above is provided in a transmission station that transmits a signal in the microwave band or the millimeter wave band, and has a power amplification function of the fundamental frequency band of the signal to be transmitted. A weak unwanted wave component (harmonic) is generated, and the unwanted wave component adversely affects other devices. For this reason, in the transmission / reception system of microwave band signals and millimeter wave band signals that are transmitted after being amplified by a large power amplifier in order to transmit far away, the level of unwanted wave components in the transmission signal is below a predetermined value. It is regulated by the Radio Law.

そのため、大電力増幅されて送信される上記の高周波数帯の送信信号中に含まれる不要波成分のレベルを測定する好ましい不要波成分測定方法が電波法で推奨されているが、その測定方法は、所定増幅率で大電力増幅された高周波数帯の送信信号を送信アンテナより空間に放出し、所定距離離れた位置に設けられた受信アンテナで受信し、その受信信号中の基本周波数の高調波である不要波成分のレベルを例えばスペクトラムアナライザ等の測定器で測定する方法である。   For this reason, a preferred method for measuring unwanted wave components that measures the level of unwanted wave components contained in the transmission signal in the high frequency band transmitted with high power amplification is recommended in the Radio Law. , A high-frequency band transmission signal that has been amplified with high power at a predetermined amplification rate is emitted from the transmission antenna to the space, received by a receiving antenna provided at a predetermined distance away, and a harmonic of the fundamental frequency in the received signal In this method, the level of the unwanted wave component is measured by a measuring instrument such as a spectrum analyzer.

しかしながら、この不要波成分測定方法は、大型の送信側装置及び受信側装置が必要で、またそれらを比較的長い距離離して設ける必要があり、更に送信側装置から実際に電波を送信する人間や、送信側装置及び受信側装置の同期をとるための方法などが必要で大規模となり、また、すべての測定装置の校正が整備されないと正確には測定できない。   However, this unnecessary wave component measurement method requires a large transmission side device and a reception side device, and they need to be provided at a relatively long distance, and a person who actually transmits radio waves from the transmission side device In addition, a method for synchronizing the transmission side device and the reception side device is necessary and becomes large-scale, and accurate measurement cannot be performed unless calibration of all measurement devices is provided.

そこで、簡易的に不要波成分を測定する方法として、従来は例えば図3に示す如き構成により不要波成分を測定している。同図において、所定レベルの送信すべきRF信号は大電力増幅器1で大電力増幅された後、方向性結合器2に供給され、その大部分がアンテナ4を介して空間に放出され、その一部分が例えばスペクトラムアナライザ等の測定器3に供給されて、その信号中に含まれる所定の高調波である不要波成分のレベルが測定される。ここで、方向性結合器2は上記の不要波成分の周波数帯で校正してある。   Therefore, as a simple method of measuring the unwanted wave component, conventionally, the unwanted wave component is measured by a configuration as shown in FIG. 3, for example. In the figure, an RF signal to be transmitted at a predetermined level is amplified by a high power amplifier 1 and then supplied to a directional coupler 2, most of which is emitted into space via an antenna 4, and a part thereof. Is supplied to a measuring instrument 3 such as a spectrum analyzer, and the level of an unwanted wave component which is a predetermined harmonic contained in the signal is measured. Here, the directional coupler 2 is calibrated in the frequency band of the unnecessary wave component.

特開昭63−198405号公報JP 63-198405 A

しかしながら、図3と共に説明した従来の送信信号の不要波成分測定方法及び測定装置では、大電力増幅器1の出力導波管系が基本周波数で設計しており、不要波成分の周波数まで保証していないということと、方向性結合器2から測定器3へ供給される信号は大電力増幅器1の出力送信電力全体でなく、その一部の電力のみであるので、導波管の伝送系を直接モニタしていないということから、測定器3による測定データの正確性に疑問がある。   However, in the conventional method and apparatus for measuring the unnecessary wave component of the transmission signal described with reference to FIG. 3, the output waveguide system of the high power amplifier 1 is designed at the fundamental frequency, and the frequency of the unnecessary wave component is guaranteed. This means that the signal supplied from the directional coupler 2 to the measuring instrument 3 is not the entire output transmission power of the large power amplifier 1, but only a part of the power. Since it is not monitored, there is a question about the accuracy of the measurement data obtained by the measuring instrument 3.

なお、特許文献1には、負荷における反射電力が増大した場合に、電源を遮断して負荷系のダメージを軽減する技術は開示されているが、大電力増幅された送信信号に含まれている不要波成分のレベルを測定する方法は開示されていない。   Patent Document 1 discloses a technique for reducing damage to a load system by shutting off a power supply when reflected power in a load increases, but is included in a transmission signal amplified with high power. A method for measuring the level of the unwanted wave component is not disclosed.

本発明は以上の点に鑑みなされたもので、大電力増幅された高周波数帯の送信信号の不要波信号のレベルを簡易的に、しかも正確に測定し得る送信信号の不要波成分測定方法及び測定装置を提供することを目的とする。   The present invention has been made in view of the above points, and a method for measuring an unnecessary wave component of a transmission signal which can easily and accurately measure the level of an unnecessary wave signal of a high frequency amplified transmission signal in a high frequency band, and It aims at providing a measuring device.

上記の目的を達成するため、本発明の不要波成分測定方法は、大電力増幅器により大電力増幅された高周波数帯の送信信号に含まれる基本周波数帯以外の不要波成分のレベルを測定する送信信号の不要波成分測定方法において、大電力増幅された送信信号を、3端子サーキュレータ機能導波管を通して、カットオフ周波数が基本周波数帯に設定され、かつ、不要波成分を通過させるように設定された1本のテーパ導波管へ供給する第1のステップと、テーパ導波管で全反射された送信信号中の基本周波数帯の信号を、3端子サーキュレータ機能導波管を通して、大電力ダミーに供給して吸収させる第2のステップと、テーパ導波管から取り出された送信信号中の不要波成分を通過させて測定器に供給して測定させる第3のステップとを含むことを特徴とする。 In order to achieve the above object, the unnecessary wave component measuring method of the present invention is a transmission that measures the level of unnecessary wave components other than the fundamental frequency band included in a high frequency band transmission signal amplified by a high power amplifier. In the method for measuring the unwanted wave component of the signal, the cut-off frequency is set to the fundamental frequency band and the unwanted wave component is passed through the transmission signal amplified with high power through the three-terminal circulator function waveguide. one of the first step of supplying to the tapered waveguide of the signal of the fundamental frequency band of the transmitting signal which has been totally reflected by the tapered waveguide, 3 through terminal circulator functions waveguide, high power dummy A second step of supplying and absorbing, and a third step of passing an unnecessary wave component in the transmission signal extracted from the tapered waveguide and supplying the measured signal to the measuring instrument for measurement. The features.

ここで、上記の不要波成分は基本周波数帯の高調波であり、また、上記の第3のステップは、テーパ導波管から取り出された送信信号中の不要波成分を同軸導波管変換器で変換して不要波成分を出力することを特徴とする。   Here, the unwanted wave component is a harmonic in the fundamental frequency band, and the third step is to convert the unwanted wave component in the transmission signal extracted from the tapered waveguide into a coaxial waveguide converter. To output an unnecessary wave component.

また、上記の目的を達成するため、本発明の不要波成分測定装置は、大電力増幅器により大電力増幅された高周波数帯の送信信号に含まれる基本周波数帯以外の不要波成分のレベルを、測定器により測定する送信信号の不要波成分測定装置において、第1、第2及び第3の端子を有し、そのうち第1の端子が大電力増幅器の出力端に接続され、大電力増幅器から出力された高周波数帯の送信信号が入力される3端子サーキュレータ機能導波管と、カットオフ周波数が基本周波数帯に設定され、かつ、不要波成分を通過させるように設定され、一端が3端子サーキュレータ機能導波管の第2の端子に接続された1本のテーパ導波管と、3端子サーキュレータ機能導波管の第3の端子に接続された大電力ダミーと、テーパ導波管の他端に入力端が接続され、出力端が測定器に接続された同軸導波管変換器とを有し、3端子サーキュレータ機能導波管の第2の端子を介してテーパ導波管に供給された大電力増幅された送信信号中の基本周波数帯の信号成分を、テーパ導波管により全反射して、3端子サーキュレータ機能導波管の第2の端子及び第3の端子を介して大電力ダミーに供給すると共に、テーパ導波管により通過した送信信号中の不要波成分を同軸導波管変換器へ出力することを特徴とする。
In order to achieve the above object, the unwanted wave component measuring apparatus of the present invention is configured to reduce the level of unwanted wave components other than the fundamental frequency band included in the transmission signal of the high frequency band that has been amplified by the high power amplifier. An apparatus for measuring an unwanted wave component of a transmission signal measured by a measuring instrument has first, second, and third terminals, of which the first terminal is connected to the output terminal of the large power amplifier and is output from the large power amplifier. 3 terminal circulator function waveguide to which the transmitted signal of the high frequency band is inputted, the cutoff frequency is set to the fundamental frequency band and is set so as to pass the unwanted wave component, and one end is a 3 terminal circulator One tapered waveguide connected to the second terminal of the functional waveguide, a high power dummy connected to the third terminal of the three-terminal circulator functional waveguide, and the other end of the tapered waveguide The input end is And a coaxial waveguide converter whose output end is connected to the measuring instrument, and a high power amplifier supplied to the tapered waveguide through the second terminal of the three-terminal circulator function waveguide The signal component of the fundamental frequency band in the transmitted signal is totally reflected by the taper waveguide and supplied to the high power dummy through the second terminal and the third terminal of the three-terminal circulator function waveguide. The unnecessary wave component in the transmission signal passed through the taper waveguide is output to the coaxial waveguide converter.

ここで、上記のテーパ導波管及び同軸導波管変換器は、それぞれ基本波周波数帯の第n次高調波(nは2以上の自然数)を通過するように設定されており、第n次高調波のレベルを不要波成分として測定することを特徴とする。   Here, the tapered waveguide and the coaxial waveguide converter are each set to pass the nth harmonic (n is a natural number of 2 or more) in the fundamental frequency band, and the nth order. The harmonic level is measured as an unnecessary wave component.

本発明の送信信号の不要波成分の測定方法及び測定装置によれば、3端子サーキュレータ機能導波管からの大電力増幅された送信信号中の基本周波数帯の信号成分を、テーパ導波管により全反射して、3端子サーキュレータ機能導波管に供給すると共に、テーパ導波管により通過した送信信号中の不要波成分を同軸導波管変換器へ出力するようにしたため、大電力増幅された送信信号中の基本波周波数成分と不要波成分とを分離でき、分離した送信信号中の不要波成分だけを同軸導波管変換器を介して測定器へ出力することができる。   According to the method and apparatus for measuring an unnecessary wave component of a transmission signal of the present invention, a signal component in a fundamental frequency band in a transmission signal amplified by a high power from a three-terminal circulator function waveguide is converted by a tapered waveguide. The total reflected wave is supplied to the three-terminal circulator function waveguide, and the unnecessary wave component in the transmission signal that has passed through the tapered waveguide is output to the coaxial waveguide converter. The fundamental frequency component and the unwanted wave component in the transmission signal can be separated, and only the unwanted wave component in the separated transmission signal can be output to the measuring device via the coaxial waveguide converter.

本発明によれば、大電力増幅された送信信号中の基本波周波数成分と不要波成分とを分離し、分離した不要波成分だけを同軸導波管変換器を介して測定器へ出力することにより、送信信号中の微弱な不要波成分の電力のみを直接測定器で測定できるようにしたため、送信される送信信号中の不要波成分を正確に測定でき、また、大規模な送信設備や受信設備が不要であるので、簡単な構成により不要波成分の測定ができる。   According to the present invention, the fundamental frequency component and the unwanted wave component in the transmission signal amplified with high power are separated, and only the separated unwanted wave component is output to the measuring instrument via the coaxial waveguide converter. As a result, only the power of the weak unwanted wave component in the transmission signal can be directly measured by the measuring instrument, so the unwanted wave component in the transmitted transmission signal can be measured accurately, and large-scale transmission equipment and reception can be used. Since no equipment is required, the unnecessary wave component can be measured with a simple configuration.

次に、本発明の実施の形態について図面と共に説明する。図1は本発明になる送信信号の不要波成分測定装置の一実施の形態のブロック図を示す。同図に示すように、本実施の形態の不要波成分測定装置は、送信すべきマイクロ波帯又はミリ波帯等の高周波数信号を大電力増幅する大電力増幅器11と、大電力増幅器11の出力端に第1の端子が接続された3端子サーキュレータ機能導波管12と、3端子サーキュレータ機能導波管12の第2の端子に接続されたテーパ導波管13と、3端子サーキュレータ機能導波管12の第3の端子に接続された大電力ダミー15と、テーパ導波管13の一端に接続された同軸導波管変換器14とから構成されており、同軸導波管変換器14の出力端にはスペクトラムアナライザ等の測定器(図示せず)が接続されている。   Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of a transmission signal unwanted wave component measuring apparatus according to the present invention. As shown in the figure, the unnecessary wave component measuring apparatus of the present embodiment includes a high power amplifier 11 that amplifies a high frequency signal such as a microwave band or a millimeter wave band to be transmitted, and a high power amplifier 11. A three-terminal circulator function waveguide 12 having a first terminal connected to the output end, a tapered waveguide 13 connected to a second terminal of the three-terminal circulator function waveguide 12, and a three-terminal circulator function guide A high-power dummy 15 connected to the third terminal of the wave tube 12 and a coaxial waveguide converter 14 connected to one end of the tapered waveguide 13 are provided. A measuring instrument (not shown) such as a spectrum analyzer is connected to the output terminal.

3端子サーキュレータ機能導波管12は、出力導波管系に実装されており、フェライト等の磁化作用により送信電力を回転させる機能を有する導波管であり、第1乃至第3の端子のうち、第1の端子から送信電力を取り入れ、第2の端子から送信電力を出力し、またテーパ導波管13により全反射された信号を第2の端子に入力され、それを第3の端子を介して大電力ダミー15に出力する。   The three-terminal circulator function waveguide 12 is mounted on the output waveguide system and is a waveguide having a function of rotating transmission power by a magnetization action of ferrite or the like, and among the first to third terminals. The transmission power is taken in from the first terminal, the transmission power is output from the second terminal, and the signal totally reflected by the tapered waveguide 13 is input to the second terminal, and the third terminal is connected to the third terminal. To the high power dummy 15.

テーパ導波管13は、送信信号の基本周波数をカットオフ周波数とし、かつ、第2次高調波の周波数帯を通過させるように設計されている。このテーパ導波管13自体は公知の構成である(例えば、特開平4−36608号公報参照)。上記の設計によりテーパ導波管13は、大電力増幅器11から入力された大電力増幅後の送信電力中、カットオフ周波数にあたる基本周波数帯の電力を全反射し、3端子サーキュレータ機能導波管12の第2の端子に伝送する一方、大電力増幅後の送信電力中の第2次高調波は同軸導波管変換器14へ出力する。   The tapered waveguide 13 is designed so that the fundamental frequency of the transmission signal is a cutoff frequency and the second harmonic wave frequency band is passed. The tapered waveguide 13 itself has a known configuration (see, for example, Japanese Patent Laid-Open No. 4-36608). With the above design, the taper waveguide 13 totally reflects the power in the fundamental frequency band corresponding to the cut-off frequency in the transmission power after the high power amplification input from the large power amplifier 11, and the three-terminal circulator function waveguide 12. The second harmonic in the transmission power after high power amplification is output to the coaxial waveguide converter 14.

3端子サーキュレータ機能導波管12は、第2の端子に入力された基本周波数帯の電力を第3の端子より出力して大電力ダミー15に吸収させる。大電力ダミー15は、導波管内で送信周波数帯の電力を抵抗体(セメントの炭素を混ぜて段差をつけたもの)で熱として吸収させる装置で、一般的に知られている。同軸導波管変換器14は、大電力増幅後の送信電力中の第2次高調波を不要波成分として測定器(図示せず)へ出力する。これにより、大電力増幅器11で増幅された大電力を除去し、微弱である不要波成分を直接測定することが可能になる。   The three-terminal circulator function waveguide 12 outputs the fundamental frequency band power input to the second terminal from the third terminal and causes the high power dummy 15 to absorb it. The large power dummy 15 is generally known as a device that absorbs power in the transmission frequency band in a waveguide as heat by a resistor (mixed with cemented carbon to form a step). The coaxial waveguide converter 14 outputs the second harmonic in the transmission power after high power amplification as an unnecessary wave component to a measuring device (not shown). As a result, it is possible to remove the high power amplified by the high power amplifier 11 and directly measure the weak unnecessary wave component.

次に、本実施の形態の動作を図2の周波数スペクトラム図と共に説明する。送信されるべき送信信号は、図示しない前段の増幅器により増幅されて、図2(A)に示すように、基本周波数f0とその第2次高調波2×f0とからなる、マイクロ波帯又はミリ波帯の高周波数のRF信号とされて大電力増幅器11に入力されて、所定の増幅度(例えば、50〜60dB程度)で大電力増幅される。なお、上記の第2次高調波2×f0は、前段の増幅器により基本周波数f0の送信信号を増幅した時に発生した不要波成分である。   Next, the operation of the present embodiment will be described with reference to the frequency spectrum diagram of FIG. A transmission signal to be transmitted is amplified by a preceding amplifier (not shown), and, as shown in FIG. 2 (A), a microwave band or millimeter having a fundamental frequency f0 and its second harmonic 2 × f0. A high frequency RF signal in a waveband is input to the high power amplifier 11 and is amplified with a predetermined amplification degree (for example, about 50 to 60 dB). The second harmonic 2 × f0 is an unnecessary wave component generated when the transmission signal having the fundamental frequency f0 is amplified by the amplifier in the previous stage.

大電力増幅器11により大電力増幅されて取り出された送信信号(送信電力)は、図2(B)に示すように、基本周波数f0成分が入力信号よりも大電力増幅により大レベルとされており、3端子サーキュレータ機能導波管12の第1の端子に入力され、それをそのまま第2の端子からテーパ導波管13へ出力する。従って、3端子サーキュレータ機能導波管12の第2の端子からテーパ導波管13へ出力される送信信号(送信電力)も、図2(C)に示すように、同図(B)と同様となる。   As shown in FIG. 2 (B), the transmission signal (transmission power) extracted by high power amplification by the high power amplifier 11 has a fundamental frequency f0 component at a higher level than the input signal by high power amplification. The signal is input to the first terminal of the three-terminal circulator function waveguide 12 and is output as it is from the second terminal to the tapered waveguide 13. Accordingly, the transmission signal (transmission power) output from the second terminal of the three-terminal circulator function waveguide 12 to the taper waveguide 13 is also the same as that shown in FIG. 2C. It becomes.

テーパ導波管13は、前述したように送信信号の基本周波数f0がカットオフ周波数とされ、かつ、第2次高調波の周波数2f0を通過させるように設計されているため、入力された図2(C)に示す周波数スペクトラムの送信信号中、大レベルの基本周波数f0の信号成分(送信電力)を全反射して3端子サーキュレータ機能導波管12の第2の端子へ出力する一方、微弱なレベルの周波数2f0の第2次高調波、すなわち不要波成分を通過させて同軸導波管変換器14へ出力する。   As described above, the tapered waveguide 13 is designed so that the fundamental frequency f0 of the transmission signal is the cut-off frequency and the second harmonic frequency 2f0 is allowed to pass. In the transmission signal of the frequency spectrum shown in (C), the signal component (transmission power) of the large level fundamental frequency f0 is totally reflected and outputted to the second terminal of the three-terminal circulator function waveguide 12, while weak. The second harmonic of the level frequency 2 f 0, that is, the unnecessary wave component is passed through and output to the coaxial waveguide converter 14.

従って、同軸導波管変換器14には、図2(D)に示すように、送信信号(送信電力)中の周波数2f0の不要波成分のみが入力され、同軸導波管変換器14は周波数2f0を出力するよう設定されているため、入力された不要波成分を出力して図示しないスペクトラムアナライザ等の測定器へ出力する。一方、テーパ導波管13で全反射された基本周波数f0成分は、3端子サーキュレータ機能導波管12の第2の端子から第3の端子を介して大電力ダミー15に入力される。従って、3端子サーキュレータ機能導波管12の第2の端子から第3の端子を介して大電力ダミー15に入力される信号は図2(E)に示されるように、大電力の基本周波数f0成分となり、この大電力の基本周波数f0成分は、大電力ダミー15により吸収される。   Therefore, as shown in FIG. 2D, only the unnecessary wave component of the frequency 2f0 in the transmission signal (transmission power) is input to the coaxial waveguide converter 14, and the coaxial waveguide converter 14 has the frequency Since it is set to output 2f0, the input unnecessary wave component is output and output to a measuring instrument such as a spectrum analyzer (not shown). On the other hand, the fundamental frequency f0 component totally reflected by the tapered waveguide 13 is input from the second terminal of the three-terminal circulator function waveguide 12 to the high power dummy 15 via the third terminal. Therefore, the signal input to the high power dummy 15 from the second terminal of the three-terminal circulator function waveguide 12 through the third terminal is the basic frequency f0 of the high power as shown in FIG. This high power fundamental frequency f 0 component is absorbed by the high power dummy 15.

このように、本実施の形態によれば、送信信号中の大電力の基本周波数f0成分のみを除去し、不要波成分の微弱な電力を送信信号から直接取り出して、同軸導波管変換器14から測定器に出力して直接モニタするようにしたため、不要波成分のレベル(電力)を正確に測定でき、しかも、電波法で推奨された測定方法に比べて簡易的に測定できる。   Thus, according to the present embodiment, only the high-power fundamental frequency f0 component in the transmission signal is removed, and the weak power of the unnecessary wave component is directly extracted from the transmission signal, so that the coaxial waveguide converter 14 Therefore, it is possible to accurately measure the level (electric power) of the unwanted wave component as compared with the measurement method recommended by the Radio Law.

なお、本発明は以上の実施の形態に限定されるものではなく、上記の実施の形態では、不要波成分として第2次高調波を例にとって説明したが、実際には送信信号中には不要波成分として、第3次高調波以上の高調波も含まれているので、第3次高調波の不要波成分のレベルを測定するときには、テーパ導波管13と同軸導波管変換器14としてそれぞれ第3次高調波を通過できる構成に設定したものを使用すればよい。同様に、測定する所望の高調波成分の周波数を、通過する周波数に設定したテーパ導波管13と同軸導波管変換器14を使用することで、所望の高調波成分の不要波成分のレベルを正確に測定することができる。   Note that the present invention is not limited to the above-described embodiment. In the above-described embodiment, the second harmonic has been described as an example of the unnecessary wave component. Since the harmonic components higher than the third harmonic are included as the wave component, when measuring the level of the unnecessary wave component of the third harmonic, the taper waveguide 13 and the coaxial waveguide converter 14 are used. What is necessary is just to use what was set to the structure which can each pass a 3rd harmonic. Similarly, by using the tapered waveguide 13 and the coaxial waveguide converter 14 in which the frequency of the desired harmonic component to be measured is set to the passing frequency, the level of the unwanted wave component of the desired harmonic component is obtained. Can be measured accurately.

また、上記の実施の形態では、大電力増幅器11に供給される信号に既に不要波成分が含まれているように説明したが、大電力増幅器11での大電力増幅の際に不要波成分が発生する場合も上記と同様にして不要波成分を測定することができる。   Further, in the above embodiment, the signal supplied to the large power amplifier 11 has been described as including an unnecessary wave component. However, when the large power amplifier 11 performs the large power amplification, the unnecessary wave component is generated. Even if it occurs, the unwanted wave component can be measured in the same manner as described above.

本発明の送信信号の不要波成分測定装置の一実施の形態のブロック図である。It is a block diagram of an embodiment of an apparatus for measuring an unnecessary wave component of a transmission signal of the present invention. 図1の各部の信号の周波数スペクトラムを示す図である。It is a figure which shows the frequency spectrum of the signal of each part of FIG. 従来の送信信号の不要波成分測定装置の一例のブロック図である。It is a block diagram of an example of the conventional unnecessary wave component measuring device of a transmission signal.

符号の説明Explanation of symbols

11 大電力増幅器
12 3端子サーキュレータ機能導波管
13 テーパ導波管
14 同軸導波管変換器
15 大電力ダミー



11 High Power Amplifier 12 3 Terminal Circulator Waveguide 13 Tapered Waveguide 14 Coaxial Waveguide Converter 15 High Power Dummy



Claims (6)

大電力増幅器により大電力増幅された高周波数帯の送信信号に含まれる基本周波数帯以外の不要波成分のレベルを測定する送信信号の不要波成分測定方法において、
前記大電力増幅された送信信号を、3端子サーキュレータ機能導波管を通して、カットオフ周波数が前記基本周波数帯に設定され、かつ、前記不要波成分を通過させるように設定された1本のテーパ導波管へ供給する第1のステップと、
前記テーパ導波管で全反射された前記送信信号中の前記基本周波数帯の信号を、前記3端子サーキュレータ機能導波管を通して、大電力ダミーに供給して吸収させる第2のステップと、
前記テーパ導波管から取り出された前記送信信号中の前記不要波成分を通過させて測定器に供給して測定させる第3のステップと
を含むことを特徴とする送信信号の不要波成分測定方法。
In a method for measuring an unnecessary wave component of a transmission signal for measuring a level of an unnecessary wave component other than a fundamental frequency band included in a transmission signal of a high frequency band amplified by a high power amplifier,
The high-power amplified transmission signal is passed through a three-terminal circulator function waveguide, and a single taper guide whose cutoff frequency is set to the fundamental frequency band and the unnecessary wave component is set to pass therethrough. A first step of supplying to the wave tube;
A second step of supplying and absorbing a signal in the fundamental frequency band in the transmission signal totally reflected by the tapered waveguide through the three-terminal circulator function waveguide to a high power dummy;
A third step of passing the unnecessary wave component in the transmission signal taken out from the tapered waveguide and supplying the unnecessary wave component to a measuring instrument to measure the component. .
前記不要波成分は、前記基本周波数の高調波であることを特徴とする請求項1記載の送信信号の不要波成分測定方法。   2. The method of measuring an unnecessary wave component of a transmission signal according to claim 1, wherein the unnecessary wave component is a harmonic of the fundamental frequency. 前記第3のステップは、前記テーパ導波管から取り出された前記送信信号中の前記不要波成分を同軸導波管変換器で変換して前記不要波成分を出力することを特徴とする請求項1記載の送信信号の不要波成分測定方法。   The said 3rd step converts the said unnecessary wave component in the said transmission signal taken out from the said taper waveguide by a coaxial waveguide converter, and outputs the said unnecessary wave component. The method for measuring an unnecessary wave component of a transmission signal according to 1. 大電力増幅器により大電力増幅された高周波数帯の送信信号に含まれる基本周波数帯以外の不要波成分のレベルを、測定器により測定する送信信号の不要波成分測定装置において、
第1、第2及び第3の端子を有し、そのうち前記第1の端子が前記大電力増幅器の出力端に接続され、前記大電力増幅器から出力された前記高周波数帯の送信信号が入力される3端子サーキュレータ機能導波管と、
カットオフ周波数が前記基本周波数帯に設定され、かつ、前記不要波成分を通過させるように設定され、一端が前記3端子サーキュレータ機能導波管の前記第2の端子に接続された1本のテーパ導波管と、
前記3端子サーキュレータ機能導波管の前記第3の端子に接続された大電力ダミーと、 前記テーパ導波管の他端に入力端が接続され、出力端が前記測定器に接続された同軸導波管変換器と
を有し、前記3端子サーキュレータ機能導波管の前記第2の端子を介して前記テーパ導波管に供給された大電力増幅された前記送信信号中の基本周波数帯の信号成分を、前記テーパ導波管により全反射して、前記3端子サーキュレータ機能導波管の前記第2の端子及び第3の端子を介して前記大電力ダミーに供給すると共に、前記テーパ導波管により通過した前記送信信号中の不要波成分を前記同軸導波管変換器へ出力することを特徴とする送信信号の不要波成分測定装置。
In an unnecessary wave component measuring apparatus for a transmission signal in which a level of an unnecessary wave component other than a fundamental frequency band included in a transmission signal in a high frequency band amplified by a large power amplifier is measured by a measuring instrument,
The first terminal is connected to the output terminal of the high power amplifier, and the high frequency band transmission signal output from the high power amplifier is input. A three-terminal circulator function waveguide,
Set the cutoff frequency to the fundamental frequency band, and the set to pass the undesired wave components, one taper having one end connected to said second terminal of said 3-terminal circulator functions waveguide A waveguide;
A high power dummy connected to the third terminal of the three-terminal circulator function waveguide, and a coaxial conductor having an input end connected to the other end of the tapered waveguide and an output end connected to the measuring instrument. And a wave tube converter, and a signal in a fundamental frequency band in the transmission signal amplified by the high power supplied to the tapered waveguide through the second terminal of the three-terminal circulator function waveguide The component is totally reflected by the tapered waveguide and supplied to the high power dummy via the second terminal and the third terminal of the three-terminal circulator function waveguide, and the tapered waveguide An unnecessary wave component measurement apparatus for a transmission signal, wherein the unnecessary wave component in the transmission signal that has passed through is output to the coaxial waveguide converter.
前記不要波成分は、前記基本周波数の高調波であることを特徴とする請求項4記載の送信信号の不要波成分測定装置。   The apparatus for measuring an unnecessary wave component of a transmission signal according to claim 4, wherein the unnecessary wave component is a harmonic of the fundamental frequency. 前記テーパ導波管及び前記同軸導波管変換器は、それぞれ前記基本波周波数帯の第n次高調波(nは2以上の自然数)を通過するように設定されており、前記第n次高調波のレベルを前記不要波成分として測定することを特徴とする請求項4記載の送信信号の不要波成分測定装置。   Each of the tapered waveguide and the coaxial waveguide converter is set to pass the nth harmonic (n is a natural number of 2 or more) in the fundamental frequency band, and the nth harmonic. The apparatus according to claim 4, wherein a wave level is measured as the unnecessary wave component.
JP2005289555A 2005-10-03 2005-10-03 Method and apparatus for measuring unwanted wave component of transmission signal Expired - Lifetime JP4480655B2 (en)

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