Surface acoustic wave filter with a ground pattern partially...

Details Surface acoustic wave filter with a ground pattern partially... Surface acoustic wave filter with a ground pattern partially...

2005-09-13

2005-09-13

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C333S133000, C310S31300R

Reexamination Certificate

active

06943649

ABSTRACT:
A surface acoustic wave filter includes multiple serial surface acoustic wave resonators and parallel surface acoustic wave resonators arranged in a ladder configuration between an input electrode pad and an output electrode pad on a piezoelectric substrate, and a grounded electrode pattern is arranged on the piezoelectric substrate so as to surround at least one of the input electrode pad and the output electrode pad. This provides a small-sized surface acoustic wave filter with improved attenuation near the pass band on the high-frequency side.

REFERENCES:
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patent: 9-199986 (1997-07-01), None
patent: 2000-196400 (2000-07-01), None
patent: 2000-341080 (2000-12-01), None

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