JPH0370414U

JPH0370414U -

Info

Publication number: JPH0370414U
Application number: JP13210689U
Authority: JP
Priority date: 1989-11-15
Filing date: 1989-11-15
Publication date: 1991-07-15

Description

[Brief explanation of drawings]

第１図から第４図は、本考案に係る高周波帯域
用フイルタの第１から第４実施例に相当する回路
図、第５図は、従来一般的に用いられている定Ｋ
型のπ型フイルタの一例を示す図、第６図は、従
来一般的に用いられている定Ｋ型のＴ型フイルタ
の一例を示す図、第７図は、第１図、第５図及び
第６図に示した各フイルタの周波数−インピーダ
ンス及び周波数−反射係数を示す特性線図、第８
図は、第１図、第５図及び第６図に示した各フイ
ルタの周波数−伝達特性線図である。１０，２０，３０……フイルタ、１１，２１，
３１……入力端子、１２，２２，３２……信号源
インピーダンス、１３，２３，３３……信号源、
１５，２５，３５……出力端子、１６，２６，３
６……負荷側インピーダンス、Ｌ１，Ｌ２，…，
Ｌｎ……インダクタンス（信号伝送ライン）、Ｃ
１，Ｃ２，…，Ｃｎ，Ｃｎ＋１……コンデンサ、
Ｒ１，Ｒ２，…Ｒｍ，Ｒｍ＋１……抵抗器。 1 to 4 are circuit diagrams corresponding to the first to fourth embodiments of the high frequency band filter according to the present invention, and FIG. 5 is a circuit diagram corresponding to a conventionally commonly used constant K filter.
FIG. 6 is a diagram showing an example of a constant K-type T-type filter that is commonly used in the past. FIG. 7 is a diagram showing an example of a constant K-type T-type filter, Characteristic diagram showing the frequency-impedance and frequency-reflection coefficient of each filter shown in Fig. 8.
The figure is a frequency-transfer characteristic diagram of each filter shown in FIGS. 1, 5, and 6. 10, 20, 30...filter, 11, 21,
31...Input terminal, 12,22,32...Signal source impedance, 13,23,33...Signal source,
15, 25, 35...output terminal, 16, 26, 3
6...Load side impedance, L1, L2,...,
Ln...Inductance (signal transmission line), C
1, C2,..., Cn, Cn+1... capacitor,
R1, R2,...Rm, Rm+1...Resistor.

Claims

[Claims for Utility Model Registration] A high-frequency band filter consisting of electrical circuit elements such as resistors, inductances, and capacitors connected in series and parallel in any combination, which is connected to an input terminal connected to a signal source and a load. The output terminal is connected to a signal transmission line in which a plurality of inductances are connected in series, and one end of the inductance located closest to the input side and the output side among the plurality of inductances is connected to a grounded resistor and a capacitor. While connecting a series circuit,
A grounded circuit including at least a capacitor is connected to the other end and both ends of the other inductance, and the impedance is gradually changed from the input terminal to the output terminal to match the impedance between the input and output terminals. A filter for high frequency bands that is characterized by: