Ceramic filter vibrating in the thickness shear-slide mode with

Details Ceramic filter vibrating in the thickness shear-slide mode with Ceramic filter vibrating in the thickness shear-slide mode with

1993-10-14

1998-09-29

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333192, 310326, 310366, H03H 956

Patent

active

058150536

ABSTRACT:
In an energy trapping type ceramic filter vibrating in the thickness shear-slide mode, vibrating electrodes are formed on opposite sides of a piezoelectric ceramic substrate, while an input terminal electrode and an output terminal electrode are provided on both end portions of the substrate so that lead terminals are soldered to the terminal electrodes. A distance l.sub.5 between the input terminal electrode and the adjacent vibrating electrode and a distance l.sub.6 between the output terminal electrode and the adjacent vibrating electrode are set within a range of one to three times the thickness of the substrate. Thus, it is possible to suppress undesired vibration other than principal vibration, thereby improving filter characteristics.

REFERENCES:
patent: 4066986 (1978-01-01), Takano et al.

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