Variable capacitance coupling antenna

H - Electricity – 01 – Q

Patent

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Details

H01Q 7/00 (2006.01) G06K 7/08 (2006.01) G06K 19/077 (2006.01) H01Q 1/22 (2006.01) H05K 1/16 (2006.01)

Patent

CA 2362415

The invention concerns a coupling antenna connected to a device transmitting/receiving electromagnetic waves containing one or several integrated capacitors. Said coupling antenna comprises at least a turn (24) screen printed on a support (28) consisting of an insulating dielectric substrate and further comprises a capacitor screen printed on the support, connected in parallel, thereby enabling to reduce the capacitance supplied by the capacitor(s) incorporated in the device, so that the resulting capacitance forms a resonating circuit with the turn. The invention also concerns the method for making such an antenna and the use of said antenna in a non-contact or hybrid contact smart card.

L'invention concerne donc une antenne de couplage connectée à un dispositif d'émission/réception d'ondes électromagnétiques contenant un ou plusieurs condensateurs intégrés. Cette antenne de couplage comprend au moins une spire (24) sérigraphiée sur un support (28) constitué par un substrat diélectrique isolant et comprend également un condensateur sérigraphié sur le support, connecté en parallèle, permettant ainsi de réduire la capacité fournie par le(s) condensateur(s) intégré(s) dans le dispositif, pour que la capacité résultante forme un circuit résonant avec la spire. L'invention concerne également le procédé de fabrication d'une telle antenne et l'utilisation de cette antenne dans une carte à puce sans contact ou hybride contact - sans contact.

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