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Frequency-hopping RFID system

  • US 20020149484A1
  • Filed: 04/11/2001
  • Published: 10/17/2002
  • Est. Priority Date: 04/11/2001
  • Status: Active Grant
First Claim
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1. A radio-frequency identification interrogator for use with a passive radio frequency identification (RFID) tag, the interrogator comprising:

  • a frequency-hopping source configured to sequentially generate radio-frequency signals at pseudo-randomly selected frequencies;

    a transmitter coupled to the frequency-hopping source and to an antenna circuit and configured to transmit the generated radio-frequency signals on the antenna circuit;

    a heterodyne receiver coupled to the antenna circuit and configured to receive on the antenna circuit reflected radio-frequency signals from the RFID tag; and

    a signal processor coupled to the antenna circuit and to the heterodyne receiver, wherein the signal processor is configured to receive the reflected radio-frequency signals and to extract data contained within the reflected radio-frequency signals that correspond to the frequency of the transmitted radio-frequency signals.

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