Patent ID: 9407307
Filing Date: 2016-08-02
CPC Classification: G06K,H04B

Claim Text:
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.