Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

2007-03-06

2007-03-06

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R, C310S363000, C333S193000

Reexamination Certificate

active

10763178

ABSTRACT:
In a surface acoustic wave filter, an input-side IDT electrode and an output-side IDT electrode are arranged on a piezoelectric substrate so as to be separated from each other in the propagation of a surface acoustic wave. The thickness of the IDT electrodes is set so that the first coefficient of the velocity-dispersion has a negative value.

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Toshikazu Kodama et al.; “Design of Low-Loss SAW Filters Employing Distributed Acoustic Reflection Transducers”; '86/10 vol. J69-C No. 10; pp. 1297-1308.

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