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Transmission delay based RFID tag

  • US 8,179,231 B1
  • Filed: 09/28/2007
  • Issued: 05/15/2012
  • Est. Priority Date: 09/28/2006
  • Status: Active Grant
First Claim
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1. A chipless RFID tag system comprising:

  • a transmitter sending an input signal;

    a chipless RFID tag comprising a tag substrate having a first microstrip and a second microstrip, wherein the second microstrip is at least twice as long as the first microstrip and the first and second microstrips have substantially uniform impedance along its length;

    wherein said chipless RFID tag further comprises at least one tap positioned between the first and second microstrips allowing one-way transmission of the input signal from the second to the first microstrip;

    wherein the first and second microstrips have a common input port to receive said input signal;

    wherein the first microstrip outputs a tag response signal determined by said at least one tap.

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