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Surface acoustic wave devices and systems including such devices

  • US 4,353,043 A
  • Filed: 10/15/1980
  • Issued: 10/05/1982
  • Est. Priority Date: 10/22/1979
  • Status: Expired due to Term
First Claim
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1. A surface acoustic wave device comprising:

  • a substrate having two surface acoustic wave propagation tracks;

    input means, at one end of the two tracks, including at least one input transducer, for launching surface acoustic waves on each track, in response to an electrical input signal;

    two output transducers, one at the end of each track;

    an output coupler having two input ports and two output ports, the two input ports being arranged to couple the two tracks; and

    ,phase differentiation means for providing a non-zero phase difference φ

    between the two input ports of the coupler;

    the output coupler giving a constructive output signal at one of the output ports when signals of phase difference φ

    are presented to the input ports, and an effectively null output signal at this output port when signals of phase difference 3φ

    are presented.

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