A portable card with an rfid coil

Details A portable card with an rfid coil A portable card with an rfid coil

H - Electricity

04

B

H04B 5/02 (2006.01)

Patent

CA 2684408

An RFID-type system is described in which a portable card receives a signal from a transceiver and outputs a phase modulated or amplitude modulated signal from which the transceiver derives information transmitted from the card. Alternatively, the card may have a coil with a self inductance of 3mH or more which, by altering the characteristics ofthe coil or a circuit connected thereto (loading the coil) facilitates a loading of the signal from the transceiver, which load change may be used for extracting the additional information.

L'invention concerne un système de type à identification par radiofréquence (RFID), dans lequel une carte portable reçoit un signal en provenance d'un émetteur-récepteur et émet un signal modulé en phase ou modulé en amplitude à partir duquel l'émetteur-récepteur déduit des informations transmises à partir de la carte. En variante, la carte peut avoir une bobine avec une inductance propre de 3 mH ou davantage qui, par altération des caractéristiques de la bobine ou d'un circuit connecté à celle-ci (chargeant la bobine) facilite un chargement du signal provenant de l'émetteur-récepteur, lequel changement de charge peut être utilisé pour extraire les informations supplémentaires.

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