Removable card for a contactless communication, its...

H - Electricity – 01 – Q

Patent

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Details

H01Q 7/06 (2006.01) G06K 19/077 (2006.01) H01Q 1/22 (2006.01)

Patent

CA 2732235

Removable card for a contactless communication contains an anten-na (4) formed of threads (10) placed on the external surface of the body (1) of the card and covered by a layer (7) of a ferromagnetic material. In advantageous ad-justment the antenna (4) contains on one area (2) of the card eight threads (10) and both areas (2) of the card are covered by a layer (7) of a ferritic foil. The antenna (4) is connected to the series with element (12) with capacity and the resistance (11) on the other side. Resonant circuit is tuned in for the final frequency from 13.0 to 15.0 MHz. The signal from the antenna (4) is read between the first and the sec-ond thread (10) from the side of the element (12) with capacity. The production method for the antenna on the body of the removable card resides in the fact that a groove of the conductive path (5) shape is dredged on the surface of the card's body (1), the groove is filled with a conductive material and a ferromagnetic mate-rial layer (7) is applied on the surface of the area (2) covering the antenna (4).

La présente invention concerne une carte amovible pour une communication sans contact. La carte contient une antenne (4) formée de filets (10) placés sur la surface externe du corps (1) de la carte et recouverts dune couche (7) dun matériau ferromagnétique. Dans une adaptation avantageuse, lantenne (4) contient, sur une zone (2) de la carte, huit filets (10) et les deux surfaces (2) de la carte sont recouvertes dune couche (7) dune feuille ferritique. Lantenne (4) est reliée en série à lélément (12) présentant une capacité et à la résistance (11) sur lautre côté. Un circuit résonant est syntonisé pour la fréquence finale de 13,0 à 15,0 MHz. Le signal provenant de lantenne (4) est lu entre le premier et le second filet (10) à partir du côté de lélément (12) présentant une capacité. Le procédé de fabrication de lantenne sur le corps de la carte amovible réside dans le fait quune rainure de la forme du trajet conducteur (5) est creusée à la surface du corps de carte (1), la rainure est remplie dun matériau conducteur et une couche de matériau ferromagnétique (7) est appliquée sur la surface de la zone (2) recouvrant lantenne (4).

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