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FREQUENCY CODED SENSORS INCORPORATING TAPERS

  • US 20070296305A1
  • Filed: 06/26/2007
  • Published: 12/27/2007
  • Est. Priority Date: 06/26/2006
  • Status: Active Grant
First Claim
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1. A coded surface acoustic wave device, comprising(a) a piezoelectric substrate;

  • (b) at least one first transducer arranged on at least a portion of said piezoelectric substrate wherein said first transducer includes at least two sub-transducers located in spatially adjacent acoustic stacks and wherein said at least two sub-transducers are electrically connected in parallel by busbars;

    (c) said at least two sub-transducers having electrode structures capable of generating and receiving acoustic waves of different frequencies, wherein a centerline of each of said at least two sub-transducers are coincident;

    (d) at least one second surface acoustic wave element formed on said piezoelectric substrate and spaced from said first transducer, said at least one second surface acoustic wave element comprising sub-elements equal in number and operating frequency to corresponding ones of said at least two sub-transducers of said first transducer; and

    (e) wherein the at least one second surface acoustic wave element is structured such that said sub-elements of said second surface acoustic wave element are spaced at different relative positions along the acoustic tracks from said first transducer, so as to effect different delays within each of said acoustic tracks, thereby effecting a code.

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