JPS59169133U

JPS59169133U - ceramic filter

Info

Publication number: JPS59169133U
Application number: JP6203883U
Authority: JP
Inventors: 勝彦郡司; 友和駒崎; 川上　泉
Original assignee: 沖電気工業株式会社
Priority date: 1983-04-27
Filing date: 1983-04-27
Publication date: 1984-11-12

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は一般のセラミックフィルタの等価回路、第２図
はセラミック共振子部の等価回路、第３図は第２図の回
路を圧電セラミック共振子と容量により実現した等価回
路、第４図は本考案の実施例、第５図は第４図の主要部
の等価回路、第６図は本考案による静電容量の構造例、
第７図は第４図の装置の等価回路、第８図は圧電セラミ
ックの制動容量の温度特性を示す図である。１−２・・・電気信号入力端子、３−４・・・電気信号
出力端子、ＣＡ、Ｃ１，Ｃ２，Ｃ３・・・外付は容量、
Ｒ１゜Ｒ２，Ｒ３・；・圧電セラミックの共振子、Ｌ・
・・セラミック振動子電極部インダクタンス、Ｃ８・・
・セラミック振動子電極部容量、Ｃｃ・・・セラミック
の制動容量。 −イーレFigure 1 is an equivalent circuit of a general ceramic filter, Figure 2 is an equivalent circuit of a ceramic resonator section, Figure 3 is an equivalent circuit of the circuit in Figure 2 realized using a piezoelectric ceramic resonator and a capacitor, and Figure 4 is an equivalent circuit of a general ceramic filter. An embodiment of the present invention, FIG. 5 is an equivalent circuit of the main part of FIG. 4, and FIG. 6 is an example of the structure of the capacitance according to the present invention.
FIG. 7 is an equivalent circuit of the device shown in FIG. 4, and FIG. 8 is a diagram showing the temperature characteristics of the braking capacity of the piezoelectric ceramic. 1-2... Electrical signal input terminal, 3-4... Electrical signal output terminal, CA, C1, C2, C3... External capacitor,
R1゜R2,R3・;・Piezoelectric ceramic resonator, L・
...Ceramic resonator electrode inductance, C8...
・Ceramic vibrator electrode capacitance, Cc... Ceramic braking capacity. −Ile

Claims

[Scope of utility model registration request]

(1) In a ceramic filter consisting of an energy trapping type piezoelectric ceramic resonator and a capacitor connected thereto, at least one dielectric of the capacitor is made of a ceramic made of the same material as the piezoelectric ceramic constituting the resonator. 1. A ceramic filter, wherein counter electrodes are attached to both sides of the ceramic.

(2) The ceramic filter according to claim 1, wherein the capacitance is a trimmed capacitance whose capacitance can be adjusted by trimming the electrodes.