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Methods and systems for activating a proximity information device

  • US 8,314,702 B2
  • Filed: 01/13/2009
  • Issued: 11/20/2012
  • Est. Priority Date: 01/13/2009
  • Status: Active Grant
First Claim
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1. A proximity information device comprising:

  • a body;

    a radio frequency identification (RFID) integrated circuit (IC) supported by the body; and

    a threshold detector coupled to the RFID IC;

    wherein the RFID IC is operative to transmit a response message in response to an interrogation signal only if the threshold detector indicates that a detected magnetic and electric field satisfy a predetermined threshold comprising a ratio of the detected electric field to the detected magnetic field.

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