High-frequency ladder type piezoelectric filter and piezoelectri

Details High-frequency ladder type piezoelectric filter and piezoelectri High-frequency ladder type piezoelectric filter and piezoelectri

1995-02-17

1996-11-12

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310357, 333191, 333186, H03H 900/9/205

Patent

active

055744141

ABSTRACT:
A ladder type piezoelectric filter of the present invention is made usable in high frequency ranges by employing a piezoelectric resonator having the second harmonic wave mode SM. A series resonator and a parallel resonator of the ladder type piezoelectric filter of the present invention are so arranged that center electrode regions and outer electrode regions are mutually polarized along opposite directions, and the center electrode regions are connected to the outer electrode regions, respectively.

REFERENCES:
patent: 4633204 (1986-12-01), Gounji et al.
patent: 5057801 (1991-10-01), Kittaker et al.
patent: 5084647 (1992-01-01), Inoue et al.
patent: 5130680 (1992-07-01), Nagai et al.
patent: 5168253 (1992-12-01), Nakagawa et al.
patent: 5260675 (1993-11-01), Ogawa et al.
patent: 5294862 (1994-03-01), Banno et al.

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