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Optical interface between receiver and tag response signal analyzer in RFID system for detecting low power resonant tags

  • US 5,959,531 A
  • Filed: 07/24/1998
  • Issued: 09/28/1999
  • Est. Priority Date: 07/24/1998
  • Status: Expired due to Term
First Claim
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1. In a radio frequency identification (RFID) system having a detection zone for detecting the presence of an article in the detection zone wherein the article is tagged with a resonant intelligent tag,(a) a receiver circuit which outputs a demodulated analog tag response signal upon detection of the intelligent tag in the detection zone;

  • (b) a tag response signal analyzing circuit including(i) an input, and(ii) a digital signal processing circuit which processes the analog tag response signal and outputs therefrom intelligent tag data; and

    (c) an optical interface connected at one end to the output of the receiver circuit and connected at the other end to the input of the tag response signal analyzing circuit for communicating the analog tag response signal from the receiver circuit to the tag response signal analyzing circuit.

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