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, adapted to cooperating with at least one transponder when said transponder enters this field, and including:
- means for regulating the signal phase in the oscillating circuit with respect to a reference value; and
means for detecting, based on a measurement of a current in the oscillating circuit and on a measurement of a voltage across a capacitive element of the oscillating circuit, an electric signature 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.
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Citations
34 Claims
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1. A terminal for generating a high-frequency electromagnetic field by means of an oscillating circuit, adapted to cooperating with at least one transponder when said transponder enters this field, and including:
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means for regulating the signal phase in the oscillating circuit with respect to a reference value; and means for detecting, based on a measurement of a current in the oscillating circuit and on a measurement of a voltage across a capacitive element of the oscillating circuit, an electric signature of a transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A method for establishing at least one communication between a terminal of generation of a high-frequency magnetic field and an electromagnetic transponder comprising determining a type of a transponder from among a set of types identified by characteristic electric parameters of the transponders linked to a sizing of an inductive resistor and/or a capacitor of oscillating circuits of the transponders, before exchanging any data message between the transponder and the terminal.
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14. A terminal for operation with at least one electromagnetic transponder, comprising:
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an oscillating circuit for generating a high-frequency electromagnetic field; and a circuit configured to detect an electrical signature of a transponder in the electromagnetic fields, wherein the electrical signature is indicative of one or more electrical characteristics linked to a sizing of an inductive resistor and/or a capacitor of an oscillating circuit of the transponder. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for operating a terminal with at least one transponder, comprising:
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generating a high-frequency electromagnetic field with an oscillating circuit; and detecting an electrical signature of a transponder in the electromagnetic field, wherein the electrical signature is indicative of one or more electrical characteristics linked to a sizing of an inductive resistor and/or a capacitor of an oscillating circuit of the transponder. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An apparatus for establishing communication between a terminal and an electromagnetic transponder, comprising:
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an oscillating circuit for generating a high-frequency electromagnetic field; and a circuit configured to determine a type of transponder in the electromagnetic field from a set of transponder types identified by characteristic electric parameters of the transponders linked to a sizing of an inductive resistor and/or a capacitor of oscillating circuits of the transponders, before exchanging any data message between the transponder and the terminal.
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Specification