Surface acoustic wave delay line with bulk wave discrimination

Details Surface acoustic wave delay line with bulk wave discrimination Surface acoustic wave delay line with bulk wave discrimination

1974-01-24

1976-06-29

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 81, 310 82, 310 95, H03H 930, H03H 926, H01L 4118, H01L 4110

Patent

active

039672212

ABSTRACT:
The disclosure relates to an acoustic surface wave device and method for long signal delays and bulk wave discrimination through the folding of a surface wave propagation path. A surface wave device is formed on the surface of an acoustic substrate and a surface wave, acoustic discontinuity is formed in the propagation path of surface waves propagated along the surface of the substrate. The acoustic discontinuity defines a reflecting surface for acoustic surface waves thereby deflecting incident surface waves along a reflecting path differing from the propagation path. Substantially all of the bulk waves propagated along the propagation path continue along this path and can be absorbed or otherwise dissipated. As a result, a substantially pure surface wave mode signal can be detected along the reflecting path. The surface waves may be reflected in this manner, i.e., by folding the path of the surface waves, a number of times as required to obtain a desired delay.

REFERENCES:
patent: 3568102 (1971-03-01), Tseng
patent: 3753164 (1973-08-01), DeVries
patent: 3771072 (1973-11-01), Slobodnik, Jr.
patent: 3772618 (1973-11-01), Slobodnik, Jr.
patent: 3883831 (1975-05-01), Williamson et al.
Wiliamson et al.,--Electronic Letters" vol. 8, No. 16, Aug. 10, 1972; pp. 401-402.

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