Rfid device with position insensitivity

Details Rfid device with position insensitivity Rfid device with position insensitivity

H - Electricity

01

Q

H01Q 1/22 (2006.01) H01Q 5/00 (2006.01) H01Q 9/28 (2006.01)

Patent

CA 2580333

An RFID device (10) includes an antenna structure (12) that provides good performance throughout a range of different positions relative to nearby materials, such as metallic objects in a carton or other container. The antenna structure has compensation elements (24/26/30/32) that interact with the nearby materials to provide good performance over the range of different positions. The compensation elements include both electrical compensation elements, which interact with the nearby materials primarily using electric fields, and magnetic compensation elements, which interact with the nearby materials primarily using magnetic fields. The electrical compensation elements and the magnetic compensation elements may be selected and may be positioned within the antenna structure such that the performance of the antenna structure is substantially unchanged (or at least acceptable) through the range of different positions.

L'invention concerne un dispositif RFID (10) comprenant une structure d'antenne (12) fournissant de bonnes performances dans une gamme de positions distinctes par rapport à des matériaux proximaux, tels que des objets métalliques dans un carton ou un autre contenant. La structure d'antenne comprend des éléments de compensation (24/26/30/32) interagissant avec les matériaux proximaux, de manière à fournir de bonnes performances dans la gamme de positions distinctes. Les éléments de compensation comprennent aussi bien des éléments de compensation électriques interagissant avec les matériaux proximaux principalement au moyen de champs électriques, que des éléments de compensation magnétiques interagissant avec les matériaux proximaux principalement au moyen de champs magnétiques. Les éléments de compensation électriques et les éléments de compensation magnétiques peuvent être sélectionnés et positionnés dans la structure d'antenne de manière que les performances de celle-ci demeurent sensiblement inchangées (ou au moins acceptables) pour la gamme de positions distinctes.

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