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Assistance for positioning a transponder

  • US 9,356,656 B2
  • Filed: 04/18/2012
  • Issued: 05/31/2016
  • Est. Priority Date: 06/03/2011
  • Status: Active Grant
First Claim
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1. A method to assist a user to position an electromagnetic transponder with respect to a terminal, comprising:

  • storing a no-load value representing a current in an oscillating circuit of the terminal when no transponder is in a field of the terminal;

    periodically determining an immediate load value representing an immediate current in the oscillating circuit of the terminal;

    repeatedly calculating a ratio between the no-load value and the immediate load value;

    determining whether the distance between a transponder and the terminal is too far, too close, or sufficient;

    communicating information to the user based on the act of determining whether the distance between the transponder and the terminal is too far, too close, or sufficient.

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