JP4643666B2 - Second harmonic suppression filter - Google Patents

Second harmonic suppression filter Download PDF

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JP4643666B2
JP4643666B2 JP2008041371A JP2008041371A JP4643666B2 JP 4643666 B2 JP4643666 B2 JP 4643666B2 JP 2008041371 A JP2008041371 A JP 2008041371A JP 2008041371 A JP2008041371 A JP 2008041371A JP 4643666 B2 JP4643666 B2 JP 4643666B2
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治夫 小島
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Toshiba Corp
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Description

本発明は、高周波回路のフィルタ装置に係り、特に基本波の２次高調波を抑圧する高調波抑圧フィルタに関する。   The present invention relates to a filter device of a high frequency circuit, and more particularly to a harmonic suppression filter that suppresses a second harmonic of a fundamental wave.

高周波回路において高調波は高周波回路の性能を悪化させる。このためこの高調波を抑圧するフィルタが提案されている（例えば、特許文献１）。   In the high frequency circuit, harmonics deteriorate the performance of the high frequency circuit. For this reason, a filter for suppressing this harmonic has been proposed (for example, Patent Document 1).

図４は従来の高調波抑圧フィルタの例である。図４に示すように、従来の高調波抑圧フィルタは、入力端子１０に接続する基本波の１／８波長の長さの第１の開放線路１１１と、入力端子１０と第１の開放線路１１１とに一端を接続する５０Ω線路１１４と、５０Ω線路１１４の他端に接続する基本波の１／８波長の長さの第２の開放線路１１２と、を備える。   FIG. 4 shows an example of a conventional harmonic suppression filter. As shown in FIG. 4, the conventional harmonic suppression filter includes a first open line 111 having a length of 1/8 wavelength of the fundamental wave connected to the input terminal 10, and the input terminal 10 and the first open line 111. And a second open line 112 having a length of 1/8 wavelength of the fundamental wave connected to the other end of the 50Ω line 114.

図５は従来の高調波抑圧フィルタの２次高調波のインピーダンスの遷移を示すイミッタンスチャートである。基本波の１／８波長の長さの第１の開放線路１１１は２次高調波には１／４波長の長さを有する開放スタブ回路として機能する。このため、図４のＦ点におけるインピーダンスは図５のＦ１点となる。   FIG. 5 is an immittance chart showing the transition of the impedance of the second harmonic of the conventional harmonic suppression filter. The first open line 111 having a length of 1/8 wavelength of the fundamental wave functions as an open stub circuit having a length of 1/4 wavelength for the second harmonic. Therefore, the impedance at point F in FIG. 4 is point F1 in FIG.

５０Ω線路１１４は任意の長さを有するため、この長さに対応したインピーダンスが生じる。このため、図４のＧ点におけるインピーダンスは図５のＧ１点となる。   Since the 50Ω line 114 has an arbitrary length, an impedance corresponding to this length is generated. Therefore, the impedance at point G in FIG. 4 is point G1 in FIG.

出力側にインピーダンスが５０Ωの負荷が接続されているとき、図４のＨ点からみると、基本波の１／８波長の長さの第２の開放線路１１２は２次高調波には１／４波長の長さを有する開放スタブ回路として機能する。このため、図４のＨ点におけるインピーダンスは図５のＨ１点となる。   When a load having an impedance of 50Ω is connected to the output side, the second open line 112 having a length of 1/8 wavelength of the fundamental wave is 1/2 for the second harmonic when viewed from point H in FIG. It functions as an open stub circuit having a length of 4 wavelengths. Therefore, the impedance at point H in FIG. 4 is point H1 in FIG.

このことは、従来の高調波フィルタは、２次高調波にとってＨ点において短絡し、ＶＳＷＲ（電圧定在波比）が大きくなり、反射損失が最大となることを意味する。このため、２次高調波を抑圧できる。
特開平８−２７４５０４号公報 This means that the conventional harmonic filter is short-circuited at the H point for the second harmonic, and the VSWR (voltage standing wave ratio) becomes large and the reflection loss is maximized. For this reason, the second harmonic can be suppressed.
JP-A-8-274504

しかし、従来の高調波フィルタは出力側に接続される負荷が、アンテナなどのようにインピーダンスが正確に５０Ωでなく、ＶＳＷＲが大きい場合には、２次高調波の抑圧が悪化するという問題点があった。   However, when the load connected to the output side of the conventional harmonic filter is not exactly 50Ω like an antenna or the like and the VSWR is large, the suppression of the second harmonic is worsened. there were.

本発明は上記のような問題点に鑑みてなされたものであり、２次高調波における周波数においてＶＳＷＲが大きい負荷を接続しても２次高調波の抑圧が悪化しない２次高調波抑圧フィルタを提供することを目的とする。   The present invention has been made in view of the above problems, and a second-order harmonic suppression filter in which suppression of second-order harmonics does not deteriorate even when a load having a large VSWR is connected at a frequency in the second-order harmonics. The purpose is to provide.

この目的を達成するために本発明の一実施形態は、出力側が２次高調波にとって短絡となる高調波フィルタと、前記高調波フィルタの出力側に接続され、出力側が２次高調波にとって開放となる高周波回路と、一端が高周波回路の出力側と出力端子に接続する終端抵抗と、基本波の１／４波長の長さを有し、一端が抵抗の他端に接続し、他端がグランドに接地する線路とを有する短絡線路と、を備える２次高調波抑圧フィルタを提供する。 In order to achieve this object, an embodiment of the present invention includes a harmonic filter whose output side is short-circuited for the second harmonic, and an output side of the harmonic filter that is connected to the output side of the harmonic filter. A high-frequency circuit having one end connected to the output side and output terminal of the high-frequency circuit, a quarter wavelength of the fundamental wave, one end connected to the other end of the resistor, and the other end to the ground A second-order harmonic suppression filter comprising a short-circuited line having a line grounded on the first line.

本発明によれば、アンテナ等の２次高調波にとってＶＳＷＲが大きい負荷を接続しても、２次高調波の抑圧が悪化しないという効果がある。   According to the present invention, even if a load having a large VSWR for the second harmonic, such as an antenna, is connected, there is an effect that suppression of the second harmonic does not deteriorate.

以下、本発明による２次高調波抑圧フィルタの一実施の形態を、図面を用いて詳細に説明する。なお、各図において同一箇所については同一の符号を付すとともに、重複した説明は省略する。   Hereinafter, an embodiment of a second harmonic suppression filter according to the present invention will be described in detail with reference to the drawings. In addition, while attaching | subjecting the same code | symbol about the same location in each figure, the overlapping description is abbreviate | omitted.

図１は本実施形態の２次高調波抑圧フィルタ１を示す回路図である。図１に示すように、２次高調波抑圧フィルタ１は、出力側が短絡となる高調波フィルタ２と、高調波フィルタ２の出力側に接続された、出力側が２次高調波にとって開放となる高周波回路と、高周波回路の出力側と出力端子１４に接続する５０Ωの終端抵抗１２に直列に接続された基本波の１／４波長の長さの短絡線路１３と、を備える。   FIG. 1 is a circuit diagram showing a second harmonic suppression filter 1 of the present embodiment. As shown in FIG. 1, the second harmonic suppression filter 1 includes a harmonic filter 2 whose output side is short-circuited, and a high frequency which is connected to the output side of the harmonic filter 2 and whose output side is open to the second harmonic. And a short-circuit line 13 having a quarter wavelength of the fundamental wave connected in series to a 50Ω termination resistor 12 connected to the output side and the output terminal 14 of the high-frequency circuit.

高周波回路は例えば高調波フィルタ２の出力側に接続された基本波の１／８波長の長さの５０Ω線路１１３が挙げられる。高周波回路はこれに限られるものではない。   Examples of the high-frequency circuit include a 50Ω line 113 having a length of 1/8 wavelength of the fundamental wave connected to the output side of the harmonic filter 2. The high frequency circuit is not limited to this.

高調波フィルタ２は、例えば入力端子１０に接続する基本波の１／８波長の長さの第１の開放線路１１１と、入力端子１０と第１の開放線路１１１とに一端を接続する５０Ω線路１１４と、５０Ω線路１１４の他端に接続する基本波の１／８波長の長さの第２の開放線路１１２と、を備える。高周波フィルタ２はこれに限られるものではない。   The harmonic filter 2 includes, for example, a first open line 111 having a length of 1/8 wavelength of the fundamental wave connected to the input terminal 10, and a 50Ω line having one end connected to the input terminal 10 and the first open line 111. 114 and the second open line 112 having a length of 1/8 wavelength of the fundamental wave connected to the other end of the 50Ω line 114. The high frequency filter 2 is not limited to this.

以上の構成をとった場合、接続は次のようになる。すなわち、２次高調波抑圧フィルタ１においては、基本波の１／８波長の長さの第１の開放線路１１１は入力端子に接続する。５０Ω線路１１４は入力端子と前記第１の開放線路とに一端を接続する。基本波の１／８波長の長さの第２の開放線路１１２は５０Ω線路１１４の他端に接続する。基本波の１／８波長の長さの５０Ω線路１１３は５０Ω線路１１４の他端と第２の開放線路１１２とに一端を接続する。基本波の１／４波長の長さの短絡線路１３は５０Ω線路１１３の他端と出力端子に接続する５０Ωの終端抵抗１２に直列に一端を接続し、他端は接地する。   When the above configuration is adopted, the connection is as follows. That is, in the second harmonic suppression filter 1, the first open line 111 having a length of 1/8 wavelength of the fundamental wave is connected to the input terminal. One end of the 50Ω line 114 is connected to the input terminal and the first open line. The second open line 112 having a length of 1/8 wavelength of the fundamental wave is connected to the other end of the 50Ω line 114. One end of the 50Ω line 113 having a length of 1/8 wavelength of the fundamental wave is connected to the other end of the 50Ω line 114 and the second open line 112. One end of the short-circuit line 13 having a length of ¼ wavelength of the fundamental wave is connected in series to the other end of the 50Ω line 113 and the 50Ω termination resistor 12 connected to the output terminal, and the other end is grounded.

次に、２次高調波抑圧フィルタ１の動作について説明する。図２は２次高調波抑圧フィルタ１の２次高調波のインピーダンスの遷移を示すイミッタンスチャートである。基本波の１／８波長の長さの第１の開放線路１１１は２次高調波には１／４波長の長さを有する開放スタブ回路として機能する。このため、図１のＡ点におけるインピーダンスは図２のＡ１点となる。   Next, the operation of the second harmonic suppression filter 1 will be described. FIG. 2 is an immittance chart showing the transition of the impedance of the second harmonic of the second harmonic suppression filter 1. The first open line 111 having a length of 1/8 wavelength of the fundamental wave functions as an open stub circuit having a length of 1/4 wavelength for the second harmonic. For this reason, the impedance at point A in FIG. 1 is point A1 in FIG.

５０Ω線路１１４は任意の長さを有するため、この長さに対応したインピーダンスが生じる。このため、図１のＢ点におけるインピーダンスは図２のＢ１点となる。   Since the 50Ω line 114 has an arbitrary length, an impedance corresponding to this length is generated. For this reason, the impedance at point B in FIG. 1 is point B1 in FIG.

図１のＣ点からみると、基本波の１／８波長の長さの第２の開放線路１１２は２次高調波には１／４波長の長さを有する開放スタブ回路として機能する。このため、図１のＣ点におけるインピーダンスは図２のＣ１点となる。   From the point C in FIG. 1, the second open line 112 having a length of 1/8 wavelength of the fundamental wave functions as an open stub circuit having a length of 1/4 wavelength for the second harmonic. Therefore, the impedance at the point C in FIG. 1 is the point C1 in FIG.

このことは、従来の高調波フィルタは、２次高調波にとってＣ点において短絡し、ＶＳＷＲが大きくなり、反射損失が最大となることを意味する。このため、ほとんどの２次高調波を抑圧できる。   This means that the conventional harmonic filter is short-circuited at the point C for the second harmonic, resulting in a large VSWR and maximum reflection loss. For this reason, most second harmonics can be suppressed.

２次高調波抑圧フィルタ１はさらに基本波の１／８波長の長さの５０Ω線路１１３を接続する。この第２の５０Ω線路１１３は２次高調波にとって１／４波長５０Ω線路として機能し、回路が開放となる。すなわち、図１のＤ点におけるインピーダンスは図２のＤ１点となる。   The second harmonic suppression filter 1 is further connected to a 50Ω line 113 having a length of 1/8 wavelength of the fundamental wave. The second 50Ω line 113 functions as a ¼ wavelength 50Ω line for the second harmonic, and the circuit is opened. That is, the impedance at point D in FIG. 1 is point D1 in FIG.

２次高調波抑圧フィルタ１はさらに５０Ωの終端抵抗１２に直列に接続された基本波の１／４波長の長さの短絡線路１３と、を備える。基本波の１／４波長の長さの短絡線路１３は２次高調波にとって１／２波長短絡線として機能し、終端抵抗１２のインピーダンスと同一になる。すなわち、出力端子１４から見たインピーダンスは終端抵抗１２のインピーダンスと同一になるため、ＶＳＷＲの値は小さく反射損失は最小となる。このため、２次高調波は終端抵抗１２において熱エネルギーに変換される。   The second-order harmonic suppression filter 1 further includes a short-circuit line 13 having a length of ¼ wavelength of the fundamental wave connected in series to a 50Ω termination resistor 12. The short-circuit line 13 having a length of 1/4 wavelength of the fundamental wave functions as a 1 / 2-wavelength short-circuit line for the second harmonic, and is the same as the impedance of the termination resistor 12. That is, since the impedance viewed from the output terminal 14 is the same as the impedance of the termination resistor 12, the value of VSWR is small and the reflection loss is minimized. For this reason, the second harmonic is converted into thermal energy in the termination resistor 12.

このようにして、２次高調波抑圧フィルタ１は２次高調波における周波数においてＶＳＷＲが大きい負荷を接続しても２次高調波を効率よく抑圧する。   In this way, the second harmonic suppression filter 1 efficiently suppresses the second harmonic even when a load having a large VSWR is connected at the frequency of the second harmonic.

ここで、基本波について説明する。図３は２次高調波抑圧フィルタ１の基本波のインピーダンスの遷移を示すイミッタンスチャートである。基本波の１／８波長の長さの第１の開放線路１１１は基本波には開放スタブ回路として機能する。このため、図１のＡ点におけるインピーダンスは図３のＡ２点となる。   Here, the fundamental wave will be described. FIG. 3 is an immittance chart showing the transition of the impedance of the fundamental wave of the second harmonic suppression filter 1. The first open line 111 having a length of 1/8 wavelength of the fundamental wave functions as an open stub circuit for the fundamental wave. For this reason, the impedance at point A in FIG. 1 is point A2 in FIG.

５０Ω線路１１４は任意の長さを有するため、この長さに対応したインピーダンスが生じる。このため、図１のＢ点におけるインピーダンスは図２のＢ２点となる。   Since the 50Ω line 114 has an arbitrary length, an impedance corresponding to this length is generated. For this reason, the impedance at point B in FIG. 1 is point B2 in FIG.

図１のＣ点からみると、基本波の１／８波長の長さの第２の開放線路１１２は基本波には開放スタブ回路として機能する。このため、図１のＣ点におけるインピーダンスは図３のＣ２点となる。すなわち、ＶＳＷＲの値は小さくなる。   From the point C in FIG. 1, the second open line 112 having a length of 1/8 wavelength of the fundamental wave functions as an open stub circuit for the fundamental wave. For this reason, the impedance at point C in FIG. 1 is point C2 in FIG. That is, the value of VSWR becomes small.

また、基本波の１／８波長の長さの５０Ω線路１１３はＶＳＷＲに影響を与えない。図１のＪ点のインピーダンスも基本波において１／４波長となる短絡線路１３の効果により開放となる。このため、出力端子１４から見たインピーダンスは図３のＣ２点と同一となり、ＶＳＷＲの値は小さく、反射損失は最小となる。   The 50Ω line 113 having a length of 1/8 wavelength of the fundamental wave does not affect the VSWR. The impedance at point J in FIG. 1 is also opened due to the effect of the short-circuit line 13 having a quarter wavelength in the fundamental wave. Therefore, the impedance viewed from the output terminal 14 is the same as the point C2 in FIG. 3, the value of VSWR is small, and the reflection loss is minimized.

以上述べたように、本実施形態の２次高調波抑圧フィルタ１は、出力側が短絡となる高調波フィルタ２と、高調波フィルタ２の出力側に接続された、出力側が２次高調波にとって開放となる高周波回路と、高周波回路の出力側と出力端子１４に接続する５０Ωの終端抵抗１２に直列に接続された基本波の１／４波長の長さの短絡線路１３と、を備える。このため、アンテナ等の２次高調波にとってＶＳＷＲが大きい負荷を接続しても、２次高調波の抑圧が悪化しないという効果がある。   As described above, the second harmonic suppression filter 1 of the present embodiment is connected to the harmonic filter 2 whose output side is short-circuited and the output side of the harmonic filter 2, and the output side is open to the second harmonic. And a short-circuit line 13 having a quarter wavelength of the fundamental wave connected in series to a 50Ω termination resistor 12 connected to the output side and the output terminal 14 of the high-frequency circuit. For this reason, there is an effect that even if a load having a large VSWR for the second harmonic, such as an antenna, is connected, suppression of the second harmonic does not deteriorate.

なお、本発明は上記実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。また、上記実施形態に開示されている複数の構成要素の適宜な組み合わせにより、種々の発明を形成できる。例えば、実施形態に示される全構成要素から幾つかの構成要素を削除してもよい。さらに、異なる実施形態にわたる構成要素を適宜組み合わせてもよい。   Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

２次高調波抑圧フィルタ１を示す回路図である。2 is a circuit diagram showing a second harmonic suppression filter 1. FIG. ２次高調波抑圧フィルタ１の２次高調波のインピーダンスの遷移を示すイミッタンスチャートである。3 is an immittance chart showing a transition of impedance of a second harmonic of the second harmonic suppression filter 1. ２次高調波抑圧フィルタ１の基本波のインピーダンスの遷移を示すイミッタンスチャートである。3 is an immittance chart showing a transition of impedance of a fundamental wave of the second harmonic suppression filter 1; 従来の高調波抑圧フィルタの例である。It is an example of the conventional harmonic suppression filter. 従来の高調波抑圧フィルタの２次高調波のインピーダンスの遷移を示すイミッタンスチャートである。It is an immittance chart which shows the transition of the impedance of the 2nd harmonic of the conventional harmonic suppression filter.

符号の説明Explanation of symbols

１：２次高調波抑圧フィルタ、
２：高調波フィルタ、
１２：終端抵抗、
１３：基本波の１／４波長の長さの短絡線路、
１１１：基本波の１／８波長の長さの第１の開放線路、
１１２：基本波の１／８波長の長さの第２の開放線路、
１１３：基本波の１／８波長の長さの５０Ω線路、
１１４：５０Ω線路。 1: Second harmonic suppression filter,
2: Harmonic filter,
12: Termination resistance,
13: Short-circuit line with a quarter wavelength of the fundamental wave,
111: a first open line having a length of 1/8 wavelength of the fundamental wave,
112: a second open line having a length of 1/8 wavelength of the fundamental wave,
113: 50Ω line with a length of 1/8 wavelength of the fundamental wave,
114: 50Ω line.

Claims (3)

出力側が２次高調波にとって短絡となる高調波フィルタと、
前記高調波フィルタの出力側に接続され、出力側が２次高調波にとって開放となる高周波回路と、
一端が前記高周波回路の出力側と出力端子に接続された終端抵抗と、基本波の１／４波長の長さを有し、一端が前記抵抗の他端に接続され、他端がグランドに接地された線路とを有する短絡線路と、
を備える２次高調波抑圧フィルタ。 A harmonic filter whose output side is a short circuit for the second harmonic,
A high frequency circuit connected to the output side of the harmonic filter, the output side being open to the second harmonic;
One end is connected to the output side and output terminal of the high-frequency circuit, and has a length of 1/4 wavelength of the fundamental wave. One end is connected to the other end of the resistor, and the other end is grounded. A short-circuit line having
A second harmonic suppression filter comprising: 出力側が２次高調波にとって短絡となる高調波フィルタと、
前記高調波フィルタの出力側に接続され、基本波の１／８波長の長さを有し、出力側が２次高調波にとって開放となる第１の線路と、
一端が前記第１の線路の他端と出力端子に接続された終端抵抗と、基本波の１／４波長の長さを有し、一端が前記抵抗の他端に接続され、他端がグランドに接地された線路とを有する短絡線路と、
を備える２次高調波抑圧フィルタ。 A harmonic filter whose output side is a short circuit for the second harmonic,
Which is connected to the output side of the harmonic filter has a length of 1/8 wavelength of the fundamental wave, a first line output side is open to the second harmonic,
A terminal resistor having one end connected to the other end of the first line and the output terminal, a length of ¼ wavelength of the fundamental wave, one end connected to the other end of the resistor, and the other end to the ground A short-circuit line having a line grounded to
A second harmonic suppression filter comprising: 入力端子に接続する基本波の１／８波長の長さの第１の開放線路と、
前記入力端子と前記第１の開放線路とに一端を接続された第２の線路と、
前記第２の線路の他端に接続する基本波の１／８波長の長さの第２の開放線路と、
前記第２の線路の他端と前記第２の開放線路とに一端を接続され、基本波の１／８波長の長さを有し、出力側が２次高調波にとって開放となる第１の線路と、
一端が前記第１の線路の他端と出力端子に接続する終端抵抗と、基本波の１／４波長の長さを有し、一端が前記抵抗の他端に接続され、他端がグランドに接地された線路とを有する短絡線路と、
を備える２次高調波抑圧フィルタ。 A first open line having a length of 1/8 wavelength of the fundamental wave connected to the input terminal;
A second line having one end connected to the input terminal and the first open line;
A second open line length of 1/8 wavelength of the fundamental wave to be connected to the other end of the second line,
The second line is connected the other end with one end to said second open line of has a length of 1/8 wavelength of the fundamental wave, a first output side is open to the second harmonic Tracks,
One end has a termination resistor connected to the other end of the first line and the output terminal, and has a length of ¼ wavelength of the fundamental wave, one end connected to the other end of the resistor, and the other end to the ground A short circuit line having a grounded line; and
A second harmonic suppression filter comprising:
JP2008041371A 2008-02-22 2008-02-22 Second harmonic suppression filter Expired - Fee Related JP4643666B2 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN112909461A (en) * 2021-01-25 2021-06-04 北京邮电大学 Complementary duplex structure full-band absorption dual-frequency band-pass filter

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
JP5203775B2 (en) * 2008-03-31 2013-06-05 三菱電機株式会社 Double harmonic suppression circuit
JP6249631B2 (en) * 2013-05-10 2017-12-20 三菱電機株式会社 Harmonic processing circuit

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JPS56121330U (en) * 1980-02-18 1981-09-16
JPH04306906A (en) * 1991-04-04 1992-10-29 Nec Corp Balance type microwave band amplifier
JPH0537204A (en) * 1991-07-26 1993-02-12 Mitsubishi Electric Corp Microwave filter
JPH1117407A (en) * 1997-06-26 1999-01-22 Hitachi Ltd Circuit and method for supplying clock signal
JP2002305419A (en) * 2001-04-06 2002-10-18 Nec Corp Suppression circuit for reflection loss

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JPS56121330U (en) * 1980-02-18 1981-09-16
JPH04306906A (en) * 1991-04-04 1992-10-29 Nec Corp Balance type microwave band amplifier
JPH0537204A (en) * 1991-07-26 1993-02-12 Mitsubishi Electric Corp Microwave filter
JPH1117407A (en) * 1997-06-26 1999-01-22 Hitachi Ltd Circuit and method for supplying clock signal
JP2002305419A (en) * 2001-04-06 2002-10-18 Nec Corp Suppression circuit for reflection loss

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112909461A (en) * 2021-01-25 2021-06-04 北京邮电大学 Complementary duplex structure full-band absorption dual-frequency band-pass filter
CN112909461B (en) * 2021-01-25 2021-08-03 北京邮电大学 Complementary duplex structure full-band absorption dual-frequency band-pass filter

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