Surface acoustic wave devices

Details Surface acoustic wave devices Surface acoustic wave devices

1975-06-27

1976-08-31

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310 81, 310 98, 333 30R, H03H 926, H03H 930

Patent

active

039784371

ABSTRACT:
A surface acoustic wave device comprises a piezoelectric substrate which carries input and output transducers for launching and receiving surface acoustic waves on the substrate, one or more reflective arrays for reflecting surface acoustic waves between the two transducers, wherein at least one array comprises numerous spaced reflecting elements of varying lengths arranged in two sets, one set being angled to reflect surface acoustic wave in one direction while the other set is angled to reflect surface acoustic wave in another direction. Varying the lengths of the reflecting elements provides weighting of signals passing through the device. Additionally pulse compression and expansion may be arranged with or without frequency dispersion.

REFERENCES:
patent: 3568102 (1971-03-01), Tseng
patent: 3680007 (1972-07-01), Tseng
patent: 3727718 (1973-04-01), Whitehouse
patent: 3873946 (1975-03-01), Weglien
patent: 3883831 (1975-05-01), Williamson et al.

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