Piezoelectric filter using LiTaO.sub.3 substrate

Details Piezoelectric filter using LiTaO.sub.3 substrate Piezoelectric filter using LiTaO.sub.3 substrate

1994-04-14

1997-03-04

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333189, 333186, 310361, H03H 900, H03H 958

Patent

active

056083629

ABSTRACT:
A multi-mode piezoelectric filter includes a piezoelectric substrate made of a LiTaO.sub.3 single crystal, a plurality of spaced electrodes which are formed adjacently on a front major surface of the substrate, and a counter electrode which is formed on a rear major surface of the substrate in opposition to the spaced electrodes. The spaced electrodes and the counter electrode coact with the intervening portion of the substrate to form two or more energy trapped type multi-mode filter elements vibrating in the thickness shear mode such that the filter elements are coupled to form a cascade connection. Damping material such as silicone gel is applied at least on the filter elements.

REFERENCES:
patent: 3644761 (1972-02-01), Doi et al.
patent: 3906410 (1975-09-01), Williams
patent: 4066986 (1978-01-01), Takano et al.
patent: 4159435 (1979-06-01), Lewis
patent: 4809244 (1989-02-01), Penneck et al.
patent: 4825983 (1989-05-01), Nakanishi
Patent Abstracts of Japan, vol. 14, No. 154 (E-0907) 23 Mar. 1990 & JP-A-02 013 0078 Jan. 17, 1990.
S. A. Sakharov, et al. "Monolithic Filters Using Strong Piezoelectrics", Forty-Fifth Annual Symposium of Frequency Control, IEEE Catalog No. 91CH2965-2, May 29, 1991, pp. 181-183.

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