METHOD AND SYSTEM FOR OPTIMIZED READING OF A RADIO FREQUENCY COMMUNICATION TRANSPONDER WITH THE AID OF A PASSIVE RESONANT CIRCUIT
First Claim
1. A method for reading RF transponders disposed in one and the same magnetic interrogation field, in which a magnetic coupling of the transponders is ensured with a passive resonant circuit during reading,wherein the passive antenna of the resonant circuit is associated with at least one transponder antenna, and the passive resonant circuit is tuned in such a way that the resonance frequency resulting from the association corresponds to one of the frequencies of the emission side bands of the transponder to be read.
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Accused Products
Abstract
The invention relates to a method of reading RF transponders disposed in one and the same magnetic interrogation field, in which a magnetic coupling of the transponders is ensured with a passive resonant circuit during reading. The method is distinguished in that the passive antenna of the resonant circuit is associated with at least one transponder antenna, and the passive resonant circuit is tuned in such a way that the resonant frequency resulting from the association corresponds to one of the frequencies of the emission side bands of the transponder to be read. The invention also relates to the system corresponding to the method, a transponder structure and an object containing the transponder, in particular a travel document.
61 Citations
20 Claims
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1. A method for reading RF transponders disposed in one and the same magnetic interrogation field, in which a magnetic coupling of the transponders is ensured with a passive resonant circuit during reading,
wherein the passive antenna of the resonant circuit is associated with at least one transponder antenna, and the passive resonant circuit is tuned in such a way that the resonance frequency resulting from the association corresponds to one of the frequencies of the emission side bands of the transponder to be read.
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14. A reading system with at least one RF transponder, with said system including
one reader able to emit an interrogation field on at least one transponder and to collect a response from the transponder, a passive resonant circuit to perform a magnetic coupling with at least one transponder during the reading, wherein the passive resonant circuit is tuned in such a way that the resonant frequency resulting from the association M of the resonant circuit with at least one transponder corresponds to one of the frequencies of the emission side bands of the transponder to be read.
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15. A supporting object containing at least one main transponder, one secondary transponder and an associated passive resonant circuit associated with at least the main transponder,
wherein the passive resonant circuit is tuned in such a way that the resonant frequency resulting from the association of the resonant circuit with at least the main transponder corresponds with one of the frequencies of the emission side bands of the secondary transponder.
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16. A supporting object containing at least one transponder and one passive resonant circuit associated with at least one transponder,
wherein the passive resonant circuit is tuned to a resonance frequency corresponding to one of the frequencies of the emission side bands of the transponder.
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17. A transponder including a flat antenna on a support defining an outer turn, wherein:
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the surface inside the outer turn is greater than a 15×
15 mm surface and smaller than or equal to a surface of approximately 30×
30 mm,the antenna includes about 13 to 18 turns, the tuning frequency is between 15 and 18 MHz, a quality factor is above 30. - View Dependent Claims (18, 19, 20)
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Specification