Detection of an electric signature of an electromagnetic transponder
First Claim
1. A terminal for generating a high-frequency electromagnetic field by means of an oscillating circuit (R1, L1, 31), adapted to cooperating with at least one transponder when said transponder enters this field, and characterized in that it includes:
- means (37) for regulating the signal phase in the oscillating circuit with respect to a reference value; and
means for detecting, based on a measurement of the current in the oscillating circuit and on a measurement of the voltage across a capacitive element (31) of the oscillating circuit, an electric signature (K2) of a transponder.
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Abstract
The invention concerns a terminal generating a high-frequency electromagnetic field by means of an oscillating circuit, adapted to co-operate with at least a transponder when the latter enters said field, comprising means (37) for regulating the phase of the signal in the oscillating circuit with respect to a reference value, and means for detecting, on the basis of a current measurement in the oscillating circuit and a voltage measurement at the terminals of a capacitive element (31) of said oscillating circuit, an electric signature of a transponder.
105 Citations
13 Claims
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1. A terminal for generating a high-frequency electromagnetic field by means of an oscillating circuit (R1, L1, 31), adapted to cooperating with at least one transponder when said transponder enters this field, and characterized in that it includes:
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means (37) for regulating the signal phase in the oscillating circuit with respect to a reference value; and
means for detecting, based on a measurement of the current in the oscillating circuit and on a measurement of the voltage across a capacitive element (31) of the oscillating circuit, an electric signature (K2) of a transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13)
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- 9. A method for establishing at least one communication between a terminal (1) of generation of a high-frequency magnetic field and an electromagnetic transponder (10), characterized in that it consists of determining a type of a transponder from among a set of types identified by characteristic electric parameters, before exchanging any data message between the transponder and the terminal.
Specification