Surface acoustic wave ladder filter device having resonators...

Details Surface acoustic wave ladder filter device having resonators... Surface acoustic wave ladder filter device having resonators...

2005-12-06

2005-12-06

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S31300R

Reexamination Certificate

active

06972644

ABSTRACT:
A surface acoustic wave device that has surface acoustic wave resonators connected in a multi-stage ladder arrangement, includes: two or more different pitches of comb-like drive electrodes of parallel-arm resonators (P1˜P3) and two or more different pitches of comb-like drive electrodes of series-arm resonators (S1˜S3); reflection electrodes (12, 14) placed at either side of a comb-like drive electrode having a pitch different from that of said comb-like drive electrode; and two or more different electrostatic capacitances of parallel-arm resonators and two or more different electrostatic capacitances of series-arm resonators.

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