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Transponder for use in a radio frequency communication system

  • US 3,946,393 A
  • Filed: 01/24/1974
  • Issued: 03/23/1976
  • Est. Priority Date: 01/24/1974
  • Status: Expired due to Term
First Claim
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1. In a radio frequency transponder wherein a received radio frequency signal is linearily amplified and then retransmitted as a radio frequency signal, the improvement comprising:

  • a. first heterodyning means, responsive to the received radio frequency signal, for converting such signal to a corresponding intermediate frequency signal;

    b. means, responsive to the amplitude of the intermediate frequency signal, for distorting such intermediate frequency signal in accordance with the amplitude of the intermediate frequency signal;

    c. second heterodyning means, for converting such distorted intermediate frequency signal to a distorted radio frequency signal; and

    ,d. a nonlinear radio frequency amplifier, fed by the second heterodyning means, adapted to operate in its nonlinear region near saturation to amplify and redistort such distorted radio frequency signal into the linearily amplified and retransmitted radio frequency signal, the characteristics of the distorting means being related to the nonlinear characteristics of the nonlinear radio frequency amplifier.

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