Electronic article surveillance antenna coils with variable...

H - Electricity – 01 – Q

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H01Q 11/12 (2006.01) G08B 13/24 (2006.01) G08B 23/00 (2006.01) H01Q 7/00 (2006.01)

Patent

CA 2453244

An EAS antenna (1) having uniform antenna thickness along the antenna height is provided. The antenna contains at least two overlapping coils (2) where the individual coil cross-section are variable with respect to the circumference. If the individual coil thickness is halved at the overlap (8), the antenna will have uniform thickness along the antenna height. This is accomplished by reducing the number of wire turns per layer along one or more sections of the coil, and simultaneously increasing the number of wire layers on the same sections.

Cette invention concerne une antenne électronique de surveillance d'articles présentant une épaisseur d'antenne uniforme sur toute la hauteur de l'antenne. Cette antenne comprend au moins deux bobines superposées dont les sections transversales individuelles varient par rapport à la circonférence. Si l'épaisseur de la bobine individuelle est réduite de moitié au niveau du chevauchement, l'antenne présente alors une épaisseur uniforme sur toute la hauteur de l'antenne. L'épaisseur de la bobine peut être réduite par la réduction du nombre de tours de fils par couche sur une ou plusieurs sections de la bobine et par une augmentation simultanée du nombre de couches de fils sur ces mêmes sections.

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