Surface acoustic wave filter and surface acoustic wave...

Details Surface acoustic wave filter and surface acoustic wave... Surface acoustic wave filter and surface acoustic wave...

2005-12-13

2005-12-13

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000

Reexamination Certificate

active

06975185

ABSTRACT:
A surface acoustic wave filter includes a series-arm resonators and parallel-arm resonators that are connected in a ladder-like structure, each having an interdigital transducer formed on a piezoelectric substrate, and at least one of the series-arm resonators having a different static capacitance from the other series-arm resonators. In this surface acoustic wave filter, at least one of the series-arm resonators except the series-arm resonator located at the first stage in the ladder-like structure has a lower average resonant frequency than the other series-arm resonators.

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patent: 6201457 (2001-03-01), Hickernell
patent: 6777855 (2004-08-01), Bergmann et al.
patent: 6828878 (2004-12-01), Takamine et al.
patent: 10-303698 (1998-11-01), None
patent: 2000-114923 (2000-04-01), None

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