Surface acoustic wave systems and methods

Details Surface acoustic wave systems and methods Surface acoustic wave systems and methods

1985-05-09

1986-10-28

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333153, 358201, 358213, 357 26, 357 30, H03H 912, H03H 9145, H04N 530

Patent

active

046201670

ABSTRACT:
Dynamic variation of the functional properties of a surface acoustic wave (SAW) device is achieved by using photoconductive material on a wave propagating substrate and illuminating the material with changing light patterns. Photoconductive materials, such as lead sulfide or cadmium sulfide, are used that are essentially dielectrics and have substantially no effect on SAW propagation when not illuminated, but under suitable levels of illumination become resistive and interact with the electric fields of the waves to dissipate energy as heat. Scanning control of the areas of illumination may be used to attenuate sidelobes and scattering in a wideband system, while intensity variations may be used to amplitude modulate the waves.

REFERENCES:
patent: 3893047 (1975-07-01), Lardat
patent: 4012586 (1977-03-01), Roos
patent: 4084189 (1978-04-01), Lean
patent: 4142212 (1979-02-01), Scott et al.

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