Elastic surface wave propagation device

Details Elastic surface wave propagation device Elastic surface wave propagation device

1975-02-05

1976-10-19

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 95, 310 98, 333 72, H03H 926, H03H 930, H03H 932, H01L 4118

Patent

active

039873773

ABSTRACT:
An elastic surface wave propagation device is disclosed which is composed of a substrate for elastic surface wave propagation and at least one transducer disposed on the major surface of the substrate for converting an electric signal into an elastic surface wave or vice versa. The substrate is formed of quartz crystal and the major surface of the substrate is 43.degree. rotated Y cut plane of the quartz crystal. The angle between the direction of propagation of the elastic surface wave and the X-axis direction of the quartz crystal is selected to be in the range of 8.degree. to 12.degree. so that spurious components are sufficiently suppressed or negligible.

REFERENCES:
patent: 3818382 (1974-06-01), Holland et al.
patent: 3873946 (1975-03-01), Weglein
Hartmann et al., "Impulse Model Design of Acoustic Surface Wave Filters" in IEEE Trans on Microwave Theory and Techniques, vol. MTT-21 No. 4, Apr. 1973; pp. 162 and 171.
Schulz et al., "Surface Acoustic Wave Delay Lines With Small Temperature Coefficient" in Proceedings IEEE (USA) vol. 58 No. 9, Sept. 1970; pp. 1361-1362.

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