Surface acoustic wave filter, boundary acoustic wave filter,...

Details Surface acoustic wave filter, boundary acoustic wave filter,... Surface acoustic wave filter, boundary acoustic wave filter,...

2008-06-06

2010-10-12

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S196000

Reexamination Certificate

active

07812688

ABSTRACT:
A surface acoustic wave filter includes a piezoelectric substrate including lithium niobate, a series resonator including a first interdigital transducer electrode provided on the piezoelectric substrate, and a parallel resonator including a second interdigital transducer electrode provided on the piezoelectric substrate and being electrically connected to the series resonator. An apodized weighting factor of the first interdigital transducer electrode is smaller than an apodized weighting factor of the second interdigital transducer electrode. This surface acoustic wave filter has a small loss.

REFERENCES:
patent: 5654680 (1997-08-01), Kwan et al.
patent: 6025763 (2000-02-01), Morimoto
patent: 08-032397 (1996-02-01), None
patent: H09-246911 (1997-09-01), None
patent: 2001-500697 (2001-01-01), None
patent: WO 2005/011117 (2005-02-01), None

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