Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1990-02-20
1991-10-15
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333191, 310320, 310366, H03H 954
Patent
active
050578014
ABSTRACT:
A piezoelectric filter device of an energy-trapped type utilizing a higher harmonic in the thickness-extensional vibration mode, having a plate-shaped body made of a piezoelectric material. At least three electrodes are arranged so as to overlap each other while being separated by layers of the piezoelectric material in the direction of thickness of the plate-shaped body. At least one of the electrodes comprises a plurality of divided electrodes which are substantially coplanar. At least one of the divided edlectrodes constitutes an input terminal and at least one of the remaining divided electrodes constitutes an output terminal. A region of the body, around the vibrating region, where the electrodes are overlapped with each other, is uniformly subjected to polarization processing in the direction of thickness.
REFERENCES:
patent: 2976650 (1961-03-01), Mattiat
patent: 3590287 (1971-06-01), Berlincourt et al.
patent: 3961210 (1976-06-01), Nagata et al.
patent: 4900970 (1990-12-01), Ando et al.
patent: 4918350 (1990-04-01), Ando et al.
patent: 4939403 (1990-07-01), Kittaka et al.
Ando Akira
Kittaka Toshihiko
Tamura Hiroshi
LaRoche Eugene R.
Lee Benny
Murata Mfg. Co. Ltd.
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