Surface acoustic wave filter, branching filter, and...

Details Surface acoustic wave filter, branching filter, and... Surface acoustic wave filter, branching filter, and...

2005-08-23

2005-08-23

Cho, James H. (Department: 2819)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S196000, C310S31300R

Reexamination Certificate

active

06933803

ABSTRACT:
A surface acoustic wave filter includes a piezoelectric substrate and a plurality of one-terminal-pair surface acoustic wave resonators, which are disposed on the piezoelectric substrate in a ladder pattern and each of which includes an IDT electrode having a pair of comb electrodes. The one-terminal-pair surface acoustic wave resonators disposed in a ladder pattern include series resonators, all of which are thinned. The electrode pitch of the IDT electrode of at least one of the series resonators is different from that of the IDT electrodes of the other series resonators.

REFERENCES:
patent: 6208224 (2001-03-01), Taniguchi et al.
patent: 6489863 (2002-12-01), Taniguchi
patent: 5-183380 (1993-07-01), None
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patent: 10242799 (1998-09-01), None
patent: 11-163664 (1999-06-01), None
patent: 2001-500697 (2001-01-01), None

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