Contactless identification device
First Claim
1. - A contactless identification device such as contactless card, hybrid card and/or electronic label including an integrated circuit, a conducting wire or strip as an electromagnetic sensor, and a capacitive element connected in parallel with said conducting wire or strip, characterized in that the conducting wire or strip is a single-turn flat conducting wire and the capacitive element is a flat capacitor, wherein the conducting wire or strip and the capacitive element are lying on a common single layer of the device, and wherein at least a portion of said conducting wire or strip and/or at least a portion of said capacitive element is shaped as a space-filling curve, being said space-filling curve defined as a curve composed by at least ten connected straight segments, wherein said segments are smaller than a tenth of the operating free-space wave length and they are spatially arranged in such a way that none of said adjacent and connected segments form another longer straight segment.
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Accused Products
Abstract
The invention relates to a contact-less identification device comprising a flat conducting structure as an electromagnetic sensor or transducer, and more particularly the invention relates to contactless cards, hybrid cards and radio operated electronic labels and tags. The electromagnetic sensor architecture according to the invention is suitable for all the applications where contactless or hybrid cards are of advantage: high volume paying and toll applications (public transportation, public sport events, person and good identification, access to controlled areas, control of shipment of goods, handling of luggage, product control in chain production environments), etc. The contact-less identification device according to the invention has had its performance enhanced by the use of space-filling techniques in the design of its electromagnetic sensor and by the use of a planar capacitor in conjunction with said flat conducting structure.
23 Citations
19 Claims
- 1. - A contactless identification device such as contactless card, hybrid card and/or electronic label including an integrated circuit, a conducting wire or strip as an electromagnetic sensor, and a capacitive element connected in parallel with said conducting wire or strip, characterized in that the conducting wire or strip is a single-turn flat conducting wire and the capacitive element is a flat capacitor, wherein the conducting wire or strip and the capacitive element are lying on a common single layer of the device, and wherein at least a portion of said conducting wire or strip and/or at least a portion of said capacitive element is shaped as a space-filling curve, being said space-filling curve defined as a curve composed by at least ten connected straight segments, wherein said segments are smaller than a tenth of the operating free-space wave length and they are spatially arranged in such a way that none of said adjacent and connected segments form another longer straight segment.
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6. - A contactless identification device according to previous claims, characterized in that at least a part of said conducting wire or strip is shaped either as a Hilbert or a Peano curve, and/or where at least a part of said capacitive element is shaped either as a Hilbert or a Peano curve.
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8. - A contactless identification device according to previous claims characterized in that said conducting wire or strip is shaped as a single-turn flat loop, in which at least a part of said loop is shaped as a space-filling curve.
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9. - A contactless identification device according to previous claims, characterized in that the conducting wire or strip forms a dipole electromagnetic sensor comprising two conducting arms in which at least a part of said conducting arms is shaped either as an space-filling curve, Hilbert, Peano, HilbertZZ, SZ, Peanoinc, Peanodec, PeanoZZ, or ZZ.
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12. - A contactless identification device according to previous claims characterized in that the conductive wire or strip and/or the capacitive element is integrated in some of the inner layers of the identification device body.
- 15. - Method of manufacturing a contactless identification device, characterized in that comprises forming a flat conducting strip and a flat capacitor element on a common single layer of a dielectric substrate, in such a way that the conducting strip and the capacitor are connected in parallel, and wherein the conducting strip and/or the capacitor are formed following a space-filling curve.
Specification