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RFID receive-only system

  • US 7,986,235 B2
  • Filed: 03/23/2007
  • Issued: 07/26/2011
  • Est. Priority Date: 03/23/2007
  • Status: Expired due to Fees
First Claim
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1. An apparatus, comprisinga receive-only radio device to receive concurrent wireless signals from multiple radio frequency identification (RFID) tags and to receive a first wireless signal directed to a first RFID tag, the first wireless signal transmitted by a primary RFID reader, the radio device comprising:

  • a digital signal processor to convert the received wireless signals into digitized data representing contents of the wireless signals, wherein the digital signal processor is configured to process the first wireless signal and determine a type of response to expect from the first RFID tag based on the first wireless signal;

    a counting module to count a number of times a particular RFID tag has responded in a read cycle; and

    a communications interface to transmit digitized data received in a response from the particular RFID tag to the primary RFID reader only once in the read cycle when multiple responses are received from the particular RFID tag during the read cycle.

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