Surface acoustic wave filter having reference potential package

Details Surface acoustic wave filter having reference potential package Surface acoustic wave filter having reference potential package

1997-12-30

2000-11-21

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313B, H03H 964

Patent

active

061509043

ABSTRACT:
A surface acoustic wave filter includes a surface acoustic wave filter element and a package for holding the surface acoustic wave filter element. The surface acoustic wave filter element includes a plurality of series arm resonators and first, second and third parallel arm resonators each disposed on a piezoelectric substrate so as to define a ladder-type circuit. The first and second parallel arm resonators are close to input and output terminals of the filter element, respectively. Reference potential electrodes of the first and second parallel arm resonators are electrically connected to first and second electrode lands which are provided on the package and electrically isolated from each other while a reference potential electrode of the third parallel arm resonator is short-circuited with the reference potential electrode of either the first or second parallel arm resonator within the package.

REFERENCES:
patent: 5506552 (1996-04-01), Seki et al.
patent: 5559481 (1996-09-01), Satoh et al.
patent: 5682126 (1997-10-01), Plesski et al.
patent: 5905418 (1999-05-01), Ehara et al.
patent: 5945893 (1999-08-01), Plessky et al.
Patent Abstracts of Japan, JP 07-176979 dated Jul. 14, 1995.
Patent Abstracts of Japan, JP 07-273597 dated Oct. 20, 1995.
Y. Satoh et al., "A Ladder Filter Using One-Port SAW Resonators", Technical Report of the Institute of Electronics, Information and Communication Engineers, US95-25, EMD95-21, CPM95-33 (Jul. 1995).

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