Surface acoustic wave filer device having a cascade filter struc

Details Surface acoustic wave filer device having a cascade filter struc Surface acoustic wave filer device having a cascade filter struc

1995-10-05

1998-01-20

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 310313R, H03H 964, H03H 925

Patent

active

057105294

ABSTRACT:
A surface acoustic wave filter device includes a piezoelectric substrate having mirror-polished surfaces on both sides, so that it is essentially free from warping. One surface of the substrate is provided with two filter stages which are cascade connected with each other thereby to sufficiently attenuate bulk wave spurious noise below a practically negligible extent. The filter device can be manufactured with an improved yield.

REFERENCES:
patent: 3675163 (1972-07-01), Hartmann et al.
patent: 4004254 (1977-01-01), DeVries
patent: 4178571 (1979-12-01), Mitchell
patent: 4396851 (1983-08-01), Kishimoto et al.
patent: 4803449 (1989-02-01), Hikita et al.
patent: 4939487 (1990-07-01), Yuhara et al.
patent: 5202652 (1993-04-01), Tabuchi et al.

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