High speed read/write AVI system

  • US 5,374,930 A
  • Filed: 11/12/1993
  • Issued: 12/20/1994
  • Est. Priority Date: 04/14/1993
  • Status: Expired due to Term
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First Claim
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1. A method of communicating between an interrogator and a transponder, the method comprising:

  • a) sending RF powering signals of frequency f1 from said interrogator to said transponder;

    b) receiving said RF powering signals in a resonant circuit of said transponder, said resonant circuit having a resonant frequency of approximately f1 ;

    c) controlling a tuning circuit in electrical communication with said resonant circuit to change the resonant frequency of said resonant circuit to approximately f3 ;

    d) sending RF communications from said interrogator, said RF communications having a carrier frequency of approximately f3 ; and

    e) receiving by said resonant circuit said RF communications.

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