JPS6224963Y2 - - Google Patents

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Publication number
JPS6224963Y2
JPS6224963Y2 JP9547180U JP9547180U JPS6224963Y2 JP S6224963 Y2 JPS6224963 Y2 JP S6224963Y2 JP 9547180 U JP9547180 U JP 9547180U JP 9547180 U JP9547180 U JP 9547180U JP S6224963 Y2 JPS6224963 Y2 JP S6224963Y2
Authority
JP
Japan
Prior art keywords
directional coupler
transmission line
microwave
wavelength
resistive load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP9547180U
Other languages
Japanese (ja)
Other versions
JPS5719602U (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP9547180U priority Critical patent/JPS6224963Y2/ja
Publication of JPS5719602U publication Critical patent/JPS5719602U/ja
Application granted granted Critical
Publication of JPS6224963Y2 publication Critical patent/JPS6224963Y2/ja
Expired legal-status Critical Current

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Description

【考案の詳細な説明】 本考案はマイクロ波ミキサや周波数逓倍回路な
どの基本波に対して2倍波の出力を得るマイクロ
波フイルタに関する。
[Detailed Description of the Invention] The present invention relates to a microwave filter that outputs a double wave of a fundamental wave, such as a microwave mixer or a frequency multiplier circuit.

従来、この種のマイクロ波フイルタは、第1図
a,bに示す構成のものが用いられていた。
Conventionally, this type of microwave filter has the configuration shown in FIGS. 1a and 1b.

第1図aの構造のものは通過帯域が非常に狭帯
域になるという欠点があり、第1図bの構造のも
のは良好な特性を得る為にフイルタの段数を多く
しなければならず構成が複雑になつてしまうとい
う欠点があつた。
The structure shown in Fig. 1a has the disadvantage that the pass band becomes extremely narrow, while the structure shown in Fig. 1b requires a large number of filter stages in order to obtain good characteristics. The drawback was that it became complicated.

本考案の目的は、これら欠点を除き、構造が簡
単でかつ良好な通過及び阻止特性の得られるマイ
クロ波フイルタを提供することにある。
An object of the present invention is to eliminate these drawbacks and provide a microwave filter that has a simple structure and provides good pass and block characteristics.

本考案は、出力位相差が実質的に90度で電力分
配比が1/2の方向性結合器と、この方向性結合
器の入出力端と接地間に接続された整合抵抗負荷
と、この抵抗負荷と並列に接続された伝送線路か
ら構成され、前記伝送線路が、前記方向性結合器
の入出力端において波長の1/4の、奇数倍とな
るマイクロ波周波数に対して開放となり偶数倍と
なるマイクロ波周波数に対して短絡となるような
電気長を有するようにしたマイクロ波フイルタに
ある。
The present invention consists of a directional coupler with an output phase difference of substantially 90 degrees and a power distribution ratio of 1/2, a matched resistive load connected between the input and output terminals of this directional coupler and ground, and It consists of a transmission line connected in parallel with a resistive load, and the transmission line is open to microwave frequencies that are odd multiples of 1/4 of the wavelength at the input and output ends of the directional coupler, and is even multiples of the wavelength. The microwave filter has an electrical length that causes a short circuit at the microwave frequency.

以下、本考案を図面により詳細に説明する。 Hereinafter, the present invention will be explained in detail with reference to the drawings.

第2図は本考案の実施例の構成図である。すな
わち、出力位相差90゜電力分配比1/2の方向性
結合器1と、この方向性結合器1の端子3,4と
接地間に所定長の伝送線路6および抵抗負荷7を
並列に接続することにより構成されている。この
構成により、入力端子2に入射したマイクロ波信
号のうち、伝送線路6の電気長が波長の1/2の
整数倍となる周波数の信号は、端子3,4におけ
る伝送線路6のインピーダンスが短絡となる。従
つて信号は端子3,4において全反射され出力端
子5に現われる。また、伝送線路6の電気長が波
長の1/4の奇数倍となる周波数の信号は、端子
3,4における伝送線路6のインピーダンスが開
放となるので、この信号は抵抗負荷7に吸収され
出力端子5には現われない。この時方向性結合器
1の中心周波数を通過帯域周波数に設定にするこ
とにより、通過帯域における損失を少なくするこ
とができる。このような方向性結合器1として
は、例えば実願昭53−63087に記載のものが適用
できる。
FIG. 2 is a configuration diagram of an embodiment of the present invention. That is, a directional coupler 1 with an output phase difference of 90° and a power distribution ratio of 1/2, a transmission line 6 of a predetermined length and a resistive load 7 are connected in parallel between the terminals 3 and 4 of this directional coupler 1 and the ground. It consists of: With this configuration, among the microwave signals incident on the input terminal 2, signals of a frequency such that the electrical length of the transmission line 6 is an integral multiple of 1/2 of the wavelength can be detected by short-circuiting the impedance of the transmission line 6 at the terminals 3 and 4. becomes. Therefore, the signal is totally reflected at terminals 3 and 4 and appears at output terminal 5. Furthermore, for a signal at a frequency where the electrical length of the transmission line 6 is an odd multiple of 1/4 of the wavelength, the impedance of the transmission line 6 at the terminals 3 and 4 becomes open, so this signal is absorbed by the resistive load 7 and output. It does not appear on terminal 5. At this time, by setting the center frequency of the directional coupler 1 to the passband frequency, loss in the passband can be reduced. As such a directional coupler 1, for example, the one described in Japanese Utility Model Application No. 53-63087 can be applied.

第3図は本考案の実施例をマイクロストリツプ
ラインによつて構成した例の特性図を示してい
る。このフイルタはアルミナセラミツク基板(誘
電率10.1)の上に、12GHzでλ/4(2.35mm)の
長さの方向性結合器と、この方向性結合器の両端
にλ/2(4.7mm)の長さの線路との50Ω薄膜抵
抗とを設けたもので、マイクロストリツプ線路に
より非常に小型なフイルタを構成している。この
場合通過帯域周波数が12GHz、阻止帯域周波数が
6GHzとなつており、阻止帯域及び通過帯域にお
いて良好なV.S.W.Rを得て、広い通過帯域幅を得
ている。さらに本実施例におけるフイルタは、マ
イクロストリツプラインで構成することにより形
状を小形にすることができ、特にマイクロ波集積
回路内におけるフイルタとして広い周波数範囲で
適用可能とするものである。
FIG. 3 shows a characteristic diagram of an example in which the embodiment of the present invention is constructed using microstrip lines. This filter has a directional coupler with a length of λ/4 (2.35 mm) at 12 GHz on an alumina ceramic substrate (dielectric constant 10.1), and a directional coupler with a length of λ/2 (4.7 mm) on both ends of this directional coupler. The microstrip line constitutes a very small filter. In this case, the passband frequency is 12GHz and the stopband frequency is
6GHz, good VSWR in the stopband and passband, and a wide passband width. Furthermore, the filter in this embodiment can be made compact by being constructed with microstrip lines, and can be applied particularly as a filter in a microwave integrated circuit over a wide frequency range.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図a,bは従来のフイルタの構成図、第2
図は本考案の実施例の構成図、第3図は本考案の
実施例の電気特性図である。図において 1……出力位相差90゜電力分配比1/2の方向
性結合器、2……入力端子、3,4……方向性結
合器1の出力端子、5……出力端子、6……伝送
線路、7……抵抗負荷、である。
Figures 1a and b are configuration diagrams of conventional filters;
The figure is a configuration diagram of an embodiment of the present invention, and FIG. 3 is an electrical characteristic diagram of the embodiment of the present invention. In the figure, 1... Directional coupler with output phase difference of 90° and power distribution ratio 1/2, 2... Input terminal, 3, 4... Output terminal of directional coupler 1, 5... Output terminal, 6... ...Transmission line, 7...Resistive load.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 出力位相差が実質的に90度で電力分配比が1/
2の方向性結合器と、この方向性結合器の入出力
端と接地間に接続された整合抵抗負荷と、この抵
抗負荷と並列に接続された伝送線路から構成さ
れ、前記伝送線路が、前記方向性結合器の入出力
端において波長の1/4の、奇数倍となるマイク
ロ波周波数に対して開放となり偶数倍となるマイ
クロ波周波数に対して短絡となるような電気長を
有することを特徴とするマイクロ波フイルタ。
The output phase difference is essentially 90 degrees and the power distribution ratio is 1/
2, a matching resistive load connected between the input/output end of the directional coupler and ground, and a transmission line connected in parallel with the resistive load, and the transmission line is connected to the It is characterized by having an electrical length at the input/output end of the directional coupler that is open to microwave frequencies that are odd multiples of 1/4 of the wavelength and short-circuited to microwave frequencies that are even multiples of the wavelength. microwave filter.
JP9547180U 1980-07-07 1980-07-07 Expired JPS6224963Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9547180U JPS6224963Y2 (en) 1980-07-07 1980-07-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9547180U JPS6224963Y2 (en) 1980-07-07 1980-07-07

Publications (2)

Publication Number Publication Date
JPS5719602U JPS5719602U (en) 1982-02-01
JPS6224963Y2 true JPS6224963Y2 (en) 1987-06-26

Family

ID=29457360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9547180U Expired JPS6224963Y2 (en) 1980-07-07 1980-07-07

Country Status (1)

Country Link
JP (1) JPS6224963Y2 (en)

Also Published As

Publication number Publication date
JPS5719602U (en) 1982-02-01

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