Surface acoustic wave device and communication device

Details Surface acoustic wave device and communication device Surface acoustic wave device and communication device

2005-01-25

2005-01-25

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

06847154

ABSTRACT:
A Shear Horizontal-type end-surface-reflection-type surface acoustic wave device includes a piezoelectric substrate having end surfaces. The most appropriate positions of the end surfaces of the piezoelectric substrate are determined. Interdigital transducers are disposed on the main surface of the piezoelectric substrate having a comparatively low relative dielectric constant ∈11T(for example, a relative dielectric constant of about 40 or less). The positions of the end surfaces are determined so that the distance from the center of the second electrode finger, counting from the outermost side in the surface acoustic wave propagation direction among the interdigital transducers, to the end surfaces (end surfaces for reflecting the surface acoustic wave) of the piezoelectric substrate satisfy the relationship (N+⅝)λs≦L≦(N+⅞)λs, where λs is the wavelength of the surface acoustic wave, and N is 0 or a positive integer.

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