Technique for widening the temperature range of surface acoustic

Details Technique for widening the temperature range of surface acoustic Technique for widening the temperature range of surface acoustic

1978-06-27

1980-07-01

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333196, H03H 926, H03H 932

Patent

active

042108837

ABSTRACT:
For widening the temperature range of a reflective array device configured on a substrate having an anisotropic temperature coefficient of delay, such as ST-quartz material, so that the signal strength does not decrease appreciably as the temperature of the device is changed over a broad range, the structural shape of the reflective array is configured such that the reflection angles of the discontinuity-creating surface structure vary across the reflecting edges of the discontinuity stripe (e.g. groove or rib) pattern. In one embodiment, the stripe pattern of the grating may be varied so that the reflection angles vary for alternating stripes. In another embodiment, opposite edges of a stripe may be non-parallel so that the reflection angles vary for each stripe. It is also possible to amplitude weight the frequency response characteristic of a grating by controlling the physical structure of the individual stripes of which a grating pattern is formed. The use of a dot array configuration is especially advantageous in this regard since amplitude weighting can be achieved simply by controlling the dot array density of each stripe, implemented in a straightforward manner by suitable design of the grating mask.

REFERENCES:
patent: 3883831 (1975-05-01), Williamson et al.
patent: 3978437 (1976-08-01), Paige
patent: 4055820 (1977-10-01), Solie
patent: 4146852 (1979-03-01), Godfrey et al.
Meyer et al.--"Reflective Surface Acoustic Wave Delay Line Material Parameters" in IEEE Ultrasonics Symposium Proceedings, 1973; pp. 500-502.

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