Core antenna for eas and rfid applications

H - Electricity – 01 – Q

Patent

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Details

H01Q 7/08 (2006.01)

Patent

CA 2596858

A core antenna system for use in electronic article surveillance (EAS) and radio frequency identification (RFID) systems. The core antenna system may include a core antenna. The core antenna may include a core, a first resonant winding disposed around at least a portion of the core, the first resonant winding having a first number of winding turns Nl, and a second non-resonant winding disposed around at least a portion of the core, the second non- resonant winding having a second number of winding turns N2, the second number of turns greater than or equal to the first number of turns. The core antenna may be mounted on a shield plate and tuned to an operating frequency on the shield plate such that when the shielded core antenna is further mounted on a mounting surface, e.g., of a checkstand, no significant de-tuning of the antenna takes lace.

L'invention concerne un système d'antenne centrale utilisé dans des systèmes de surveillance électronique d'articles (EAS) et d'identification par radiofréquence (RFID). Le système d'antenne centrale comprend une antenne centrale. L'antenne centrale comprend un noyau, un premier bobinage résonant disposé autour d'au moins une partie du noyau, le premier bobinage résonant présentant un premier nombre de spires N1, et un second bobinage non résonant disposé autour d'au moins une partie du noyau, le second bobinage non résonant présentant un second nombre de spires N2, le second nombre de spires étant supérieur ou égal au premier nombre de spires. L'antenne centrale peut être montée sur une plaque de protection et accordée sur une fréquence d'exploitation sur la plaque de protection de manière que, lorsque l'antenne centrale protégée est montée sur une surface de montage, par exemple, d'un poste à encaissement, aucun désaccord significatif de l'antenne ne soit nécessaire.

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