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Surface acoustic wave transponder configuration

  • US 5,986,382 A
  • Filed: 08/18/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 08/18/1997
  • Status: Expired due to Term
First Claim
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1. An acoustic wave identification transponder device, having a substrate, an electroacoustic transducer generating an acoustic wave in said substrate and a set of encoding elements disposed in a path of the acoustic wave for modifying the acoustic wave, wherein the improvement comprises:

  • at least two reflective elements disposed in the acoustic path of the acoustic wave such that an acoustic path length of the acoustic wave on the substrate is longer than twice a largest linear dimension of the substrate.

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