Electronic article surveillance system

Details Electronic article surveillance system Electronic article surveillance system

G - Physics

08

B

G08B 13/22 (2006.01) G08B 13/24 (2006.01) H01Q 7/04 (2006.01)

Patent

CA 2251326

An EAS system capable of reliable operation at high frequencies such as about 8 MHz, has an arrangement of transmitter and receiver antennas (20, 18) each lying in a flat, horizontal plane in substantial alignment, with the receiver antenna (18) positioned at the floor of a passageway and the transmitter antenna (20) positioned overhead. Each antenna takes the form of a pair of parallel-connected, coplanar loops (36, 40), with the transmitter antenna loops (36) having current flowing in the same direction while the receiver antenna loops (40) having current flowing in opposing directions.

Système électronique de surveillance d'articles fonctionnant de manière fiable à des fréquences élevées, de l'ordre de 8 Mhz, et disposant d'antennes émettrice et réceptrice (20, 18) situées sur le plan horizontal et alignées l'une par rapport à l'autre, l'antenne réceptrice (18) étant située dans le plancher de la sortie d'un magasin et l'antenne émettrice (20) étant placée sous le plafond. Chaque antenne prend la forme d'une paire de cadres (36, 40) coplanaires connectés en parallèle, où les flux de courant des cadres de l'antenne émettrice (36) prennent une même direction tandis que les flux de courant de l'antenne réceptrice (40) prennent des directions opposées.

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