Surface acoustic wave device and portable telephone using same

Details Surface acoustic wave device and portable telephone using same Surface acoustic wave device and portable telephone using same

1997-03-06

1998-12-29

Dougherty, Thomas J.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310360, H03H 925, H01L 4108

Patent

active

058545271

ABSTRACT:
The surface acoustic wave device of the invention comprises a piezoelectric substrate of lithium niobate or lithium tantalate and electrodes formed on the substrate for propagating surface acoustic waves. The substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles and within ranges substantially equivalent thereto. When the substrate is made of lithium niobate, .phi., .theta. and .psi. are 0.degree.-86.degree. or 95.degree.-180.degree., 73.degree.-118.degree. and 0.degree.-44.degree., respectively. When the substrate is made of lithium tantalate, .phi., .theta. and .psi. are 0.degree.-87.degree. or 91.degree.-180.degree., 80.degree.-120.degree. and 0.degree.-44.degree., respectively. This enables the device to exhibit high performance.

REFERENCES:
patent: 4409571 (1983-10-01), Milsom et al.
patent: 5081389 (1992-01-01), Abbott et al.
patent: 5420472 (1995-05-01), Cho et al.
patent: 5548256 (1996-08-01), Watanabe et al.

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