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LONG RANGE SELECTIVE RFID USING LASER PHOTODETECTION WAKEUP

  • US 20110091216A1
  • Filed: 10/20/2009
  • Published: 04/21/2011
  • Est. Priority Date: 10/20/2009
  • Status: Active Grant
First Claim
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1. A data transfer system comprising:

  • a) a radio frequency identification (RFID) reader comprising;

    i) a radio frequency transmitter and receiver;

    ii) a laser in the hand held device; and

    b) a RFID tag on a container comprising;

    i) a tag antenna coupled to an electronic circuit for receiving radio signals from the radio frequency transmitter and transmitting radio frequency signals to the receiver;

    ii) a first photosensitive device coupled to the electronic circuit which is in a first state when light from the laser is not striking the photosensitive device and in a second state when light from the laser is striking the photosensitive device such that the RFID tag transmits a signal only when a light beam from the laser is striking the photosensitive device;

    c) wherein the radio frequency transmitter provides power to the RFID tag sufficient to power the electronic circuit and to transmit a signal to the receiver which can be decoded by the RFID reader; and

    d) wherein the RFID reader is at least 40 feet away from the RFID tag.

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