Surface acoustic wave device, equipment including the same with

Details Surface acoustic wave device, equipment including the same with Surface acoustic wave device, equipment including the same with

1995-05-30

1998-03-17

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, 310317, H03H 964

Patent

active

057290768

ABSTRACT:
A surface acoustic wave device having a novel structure capable of restricting TTE and ripple noise on a frequency characteristics and group delay time characteristics thereof is provided under a condition by which acoustic reflection is suppressed when there is internal dissipation in the device and/or a peripheral circuit thereof. When the device includes a unidirectional interdigital transducer, it is possible to restrict ripple of the frequency characteristics and the group delay time characteristics and to reduce loss without using a phase shifter. By using the surface acoustic wave device according to the present invention, a communication apparatus can be improved in performance.

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patent: 5473295 (1995-12-01), Turunen

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