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Generation of trigger events by RFID labels

  • US 9,460,324 B2
  • Filed: 02/15/2013
  • Issued: 10/04/2016
  • Est. Priority Date: 03/07/2012
  • Status: Active Grant
First Claim
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1. An apparatus for detecting a tag, having a transponder with a first antenna, for identification by electromagnetic waves and triggering of a supplementary system, the apparatus comprising:

  • second and third antennas electromagnetically coupled together;

    a reader, electrically connected to the second antenna, supplying energy to the transponder via electromagnetic coupling between the first and second antennas and interchanging data with the transponder; and

    a synchronization unit, electrically connected to the third antenna, outputting a trigger signal activating the supplementary system based on occurrence of the data interchange between the transponder and the reader when detected using the third antenna, wherein the supplementary system, during output of the trigger signal, introduces modulation enabling determination of a distance to the reader using the third antenna.

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