Evaluation of the coupling factor of an electromagnetic transponder by capacitive detuning
AssigneeSTMicroelectronics (Rousset) SAS
InventorLuc Wuidart
Life of this patent
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Abstract
A method for evaluating the current coupling factor between an electromagnetic transponder and a terminal, and a transponder implementing this method, wherein a ratio between data representative of a voltage across an oscillating circuit of the transponder and obtained for two capacitance values of the oscillating circuit is compared with one or several thresholds.
Claims7
A method for evaluating the current coupling factor between an electromagnetic transponder and a terminal, wherein a ratio between data representative of a voltage across an oscillating circuit of the transponder and obtained for two capacitance values of the oscillating circuit, is compared with one or several thresholds.
Dependencies are inferred from the claim text.