Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

2006-09-05

2006-09-05

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C333S195000

Reexamination Certificate

active

07102269

ABSTRACT:
A surface acoustic wave device includes first and second surface acoustic wave resonator filters connected in parallel to each other. The first double-mode surface acoustic wave resonator filter has resonance frequencies f1L and f1H and the second double-mode surface acoustic wave resonator filter has resonance frequencies f2L and f2H, where f1H=f2L. A Q factor of a resonance mode of one of the first and the second double-mode surface acoustic wave resonator filter is less than that of the other surface acoustic wave resonator filter, or an energy transmittance of the reflectors in at least one of the first and the second surface acoustic wave resonator filters ranges from about 12% to about 28%.

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