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Electronic transponder tuning procedure

  • US 5,396,251 A
  • Filed: 12/15/1992
  • Issued: 03/07/1995
  • Est. Priority Date: 12/15/1992
  • Status: Expired due to Term
First Claim
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1. A method of communicating between an interrogator unit having a first resonant circuit and a responder unit having a second resonant circuit, said method comprising the steps of:

  • a) storing energy in a responder unit energy accumulator in a contactless fashion by RF energy transmitted from said interrogator unit to said responder unit;

    b) exciting within the resonant circuit of said responder unit an RF carrier wave;

    c) measuring the signal strength of said RF carrier wave; and

    d) adjusting the resonant frequency of one of said resonant circuits responsive to said signal strength measurement.

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