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Cloaking circuit for use in a radiofrequency identification and method of cloaking RFID tags to increase interrogation reliability

  • US 5,963,144 A
  • Filed: 05/30/1997
  • Issued: 10/05/1999
  • Est. Priority Date: 05/30/1997
  • Status: Expired due to Term
First Claim
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1. An improvement in an RFID tag passively powered through an antenna comprising:

  • a series switch coupled between said antenna and said RFID tag; and

    a time-delay circuit coupled to and controlling said series switch to activate said series switch to disconnect said RFID tag from said antenna for a predetermined time delay, said timed-delay circuit being activated upon a logic command, CLOAK, generated by said RFID tag, so that said antenna is provided during said predetermined time period with a high antenna load, thereby reducing the effective absorption and scattering aperture of said antenna during said predetermined time period.

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