Surface acoustic wave device and duplexer and communication...

Details Surface acoustic wave device and duplexer and communication... Surface acoustic wave device and duplexer and communication...

2008-03-28

2010-02-09

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000

Reexamination Certificate

active

07659796

ABSTRACT:
A surface acoustic wave device includes a first surface acoustic wave filter forming a ladder filter circuit; and a second surface acoustic wave filter having a passband at a frequency range higher than that of the first surface acoustic wave filter. The first surface acoustic wave filter includes a series-arm surface acoustic wave resonator, a parallel-arm surface acoustic wave resonator and an additional surface acoustic wave resonator. The series-arm surface acoustic wave resonator is on a series arm of the ladder filter circuit and includes an IDT electrode. The parallel-arm surface acoustic wave resonator is on a parallel arm of the ladder filter circuit and includes an IDT electrode. The additional surface acoustic wave resonator includes an IDT electrode, is connected in parallel with the series-arm surface acoustic wave resonator, and has a resonance frequency higher than the frequency range of the passband of the second surface acoustic wave filter.

REFERENCES:
patent: 6710677 (2004-03-01), Beaudin et al.
patent: 7271684 (2007-09-01), Nishihara et al.
patent: 7385464 (2008-06-01), Shibagaki et al.
patent: 7573354 (2009-08-01), Nishihara et al.

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