Antenna and transmitter arrangement for eas system

Details Antenna and transmitter arrangement for eas system Antenna and transmitter arrangement for eas system

H - Electricity

01

Q

H01Q 11/12 (2006.01) G08B 13/14 (2006.01) G08B 13/24 (2006.01) G08B 26/00 (2006.01) H01Q 7/00 (2006.01) H01Q 7/04 (2006.01) H01Q 11/14 (2006.01) H01Q 21/00 (2006.01)

Patent

CA 2312929

An antenna system for an electronic article surveillance system, comprising: a first, tunable transmitting loop (12); a second, tunable transmitting loop (14), the first and second transmitting loops being arranged for first and second modes of operation, the transmitting loops being field-coupled to one another such that tuning the antenna system for one of the modes of operation detunes the antenna system for the other mode of operation; a tunable compensation coil (16) field-coupled to each of the first and second transmitting loops, the tunable compensation coil enabling the antenna system to be tuned for operation in one of the modes at a first resonant frequency, and despite the detuning, enabling the antenna system to be tuned for operation in the other of the modes at a second frequency independently of the tuning for the first mode of operation. The compensation loop (16) encircles the first and second transmitting loops (12, 14).

L'invention concerne une configuration d'antenne pour système de surveillance électronique d'article, qui comprend les éléments suivants: première boucle d'émission réglable (12); seconde boucle d'émission réglable (14), lesdites boucles étant configurées respectivement pour des premier et second modes de fonctionnement, en couplage de champ réciproque de sorte que la configuration d'antenne correspondant à l'un des modes désyntonise la configuration d'antenne correspondant à l'autre mode de fonctionnement; une bobine de compensation réglable (16) à couplage de champ avec chacune des deux boucles précédentes, qui permet un réglage de la configuration d'antenne dans l'un des modes sur une première fréquence de résonance et qui, malgré la désyntonisation, permet un réglage dans l'autre mode sur une seconde fréquence de résonance, indépendamment du réglage correspondant au premier mode de fonctionnement. La boucle de compensation (16) encercle les première et seconde boucles d'émission (12, 14).

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