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Identification of objects using frequency characteristics of RFID tags

  • US 9,818,053 B2
  • Filed: 12/09/2008
  • Issued: 11/14/2017
  • Est. Priority Date: 12/19/2007
  • Status: Active Grant
First Claim
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1. An apparatus that identifies an object, comprising:

  • a plurality of RFID tags disposed with the object, wherein each RFID tag includes an integrated circuit for storing information in memory, processing information, and modulating or demodulating a radio frequency (RF) signal and an antenna for receiving and transmitting RF signals;

    an RFID reader that receives signals including information comprising content stored in memory from the plurality of RFID tags, the RFID reader further including a frequency detector that detects a plurality of frequencies over which the plurality of RFID tags transmit said information;

    a frequency pattern generator that receives frequency information detected by the RFID reader and generates a frequency pattern based on the received frequency information, the frequency pattern having the general form {Af1;

    Bf2;

    . . . Xfn}, where A, B, . . . X are integers that indicate the number of RFID tags that transmit respective signals including information over each respective frequency f1, f2, . . . , fn, and n is a number of frequencies detected; and

    an object identifier that receives the generated frequency pattern and compares the generated frequency pattern to known frequency patterns and, based on the comparison, identifies the object.

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