Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

1981-02-18

1982-07-27

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333193, 331107A, H03H 942, H03H 964, H03B 532, H01L 4118

Patent

active

043420125

ABSTRACT:
A surface acoustic wave device in which an X-cut LiTaO.sub.3 single crystal substrate has its one major surface coated with a SiO.sub.2 film and the direction of propagation of surface acoustic waves is selected between 80.degree. and 180.degree. measured from the Y-axis toward the Z-axis. The surface acoustic wave devices in accordance with the present invention has an extremely low temperature coefficient change and a high electro-mechanical coupling coefficient, exhibits a higher degree of both short- and long-term stability, and can suppress the generation of unwanted waves to a minimum or negligible degree.

REFERENCES:
patent: 3786373 (1974-01-01), Schulz et al.
patent: 3965444 (1976-06-01), Willingham et al.
patent: 4245201 (1981-01-01), Takahashi et al.

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