Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1992-12-21
1995-01-17
Lee, Benny
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333192, 310321, H03H 956, H03H 958
Patent
active
053829301
ABSTRACT:
This invention discloses a monolithic multipole stacked crystal filter comprised of a series of cascaded 2-port semiconductor bulk acoustic resonator stacked crystal filters electrically cascaded and a shunt inductor connected between each of the 2-port filters. Each of the 2-port filters including a first and second piezoelectric layer, typically aluminum nitride. A first input electrode is positioned on a top surface of one of the piezoelectric layers and a second output electrode is positioned on a bottom surface of the other of the piezoelectric layers. A ground electrode is positioned between the piezoelectric layers. In this regard, the piezoelectric layers will resonate at a resonant frequency and provide bandpass filter characteristics. The complete monolithic multipole filter provides control of the passband shape which yields highly desirable filter characteristics.
REFERENCES:
patent: 3344369 (1967-09-01), Bies et al.
patent: 3624564 (1971-11-01), Ise et al.
patent: 3983518 (1976-09-01), Bezemer
patent: 5185589 (1993-02-01), Krishnaswamy et al.
patent: 5194836 (1993-03-01), Vale et al.
Crawford Jay D.
Cushman Drew
Garber Edward M.
Stokes Robert B.
Lee Benny
TRW Inc.
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