Surface acoustic wave element having a wide bandwidth and a low

Details Surface acoustic wave element having a wide bandwidth and a low Surface acoustic wave element having a wide bandwidth and a low

1992-03-26

1993-10-26

Stephan, Steven L.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313R, H01L 4108

Patent

active

052569276

ABSTRACT:
A surface acoustic wave element has a low insertion loss in one direction and a wide band width. This surface acoustic wave element has first and second interdigital electrodes each having a thickness on a piezoelectric or electrostrictive substrate. In a first interdigital electrode for exciting a surface acoustic wave, positive and negative electrodes are alternately arranged such that their electrode widths and periods are gradually decreased in a direction of propagation of the surface acoustic wave. In a second interdigital electrode for receiving the surface acoustic wave, positive and negative electrodes are alternately arranged such that their electrode widths and periods are gradually increased or decreased in the direction of propagation of the surface acoustic wave.

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patent: 4701657 (1987-10-01), Grassl
patent: 4918349 (1990-03-01), Shiba et al.

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