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Transponder positioning aid

  • US 9,407,307 B2
  • Filed: 04/18/2012
  • Issued: 08/02/2016
  • Est. Priority Date: 06/03/2011
  • Status: Active Grant
First Claim
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1. A method to assist a user positioning an electromagnetic transponder with respect to a terminal, comprising:

  • calculating by the terminal a first ratio relating a first coupling factor between the electromagnetic transponder and the terminal to a selected optimum coupling factor, the selected optimum coupling factor based on a first resistive load value;

    storing the calculated first ratio;

    controlling a variable capacitance circuit of the terminal with control information generated by a phase interval detection circuit, the phase interval detection circuit arranged to receive data representative of current flowing through a measurement element of the terminal, the current flowing through the measurement element of the terminal corresponding to a current coupling factor between the electromagnetic transponder and the terminal;

    calculating by the terminal a current ratio relating the current coupling factor between the electromagnetic transponder and the terminal to the selected optimum coupling factor;

    comparing by the terminal said current ratio with said first ratio; and

    controlling at least one output data element according to said comparison.

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