Elastic surface wave transmitting device for eliminating multipl

Details Elastic surface wave transmitting device for eliminating multipl Elastic surface wave transmitting device for eliminating multipl

1976-04-27

1977-05-24

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310 83, 333 30R, H03H 904, H03H 926, H03H 932, H03H 930

Patent

active

040258807

ABSTRACT:
An elastic surface wave transmitting device comprising a piezoelectric substrate S.sub.1 on which is arranged a transmitting transducer T.sub.E placed on the center of the substrate S.sub.1, and two receiving transducers T.sub.R1 and T.sub.R2 arranged on either side of the transmitting transducer T.sub.E, means (a metallic wafer P.sub.1, for example deposited by evaporation on to the substrate S.sub.1) enabling the waves transmitted by the transmitting transducer T.sub.E towards each of the receiving transducers T.sub.R1 and T.sub.R2 to be phase-shifted so that the waves O.sub.1 and O.sub.2 respectively reflected by these receiving transducers T.sub.R1 and T.sub.R2 cancel one another out at the transmitting transducer T.sub.E.

REFERENCES:
patent: 3845420 (1974-10-01), Holland et al.
patent: 3868608 (1975-02-01), Williams
patent: 3872410 (1975-03-01), Zucker
patent: 3908137 (1975-09-01), Hunsinger et al.
patent: 3972011 (1976-07-01), Coussot et al.

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