Contactless identification device
First Claim
1. An antenna, comprising:
- a conducting wire including a first single-turn loop;
a capacitor coupled to the conducting wire in parallel, the capacitor having a first conductor spaced apart from a second conductor by a gap, the first conductor, the second conductor, and the gap being arranged as a second single-turn loop that is generally co-planar with the first single-turn loop; and
wherein at least one of the conducting wire and the gap of the capacitor includes a portion shaped as a space-filling curve having a plurality of connected straight segments spatially arranged so that none of the adjacent and connected segments form a straight segment longer than the individual segments, the straight segments having generally the same length.
5 Assignments
0 Petitions
Accused Products
Abstract
A contactless identification device includes a flat conducting structure as an electromagnetic sensor or transducer. An electromagnetic sensor architecture is suitable for all 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 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.
17 Citations
16 Claims
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1. An antenna, comprising:
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a conducting wire including a first single-turn loop; a capacitor coupled to the conducting wire in parallel, the capacitor having a first conductor spaced apart from a second conductor by a gap, the first conductor, the second conductor, and the gap being arranged as a second single-turn loop that is generally co-planar with the first single-turn loop; and wherein at least one of the conducting wire and the gap of the capacitor includes a portion shaped as a space-filling curve having a plurality of connected straight segments spatially arranged so that none of the adjacent and connected segments form a straight segment longer than the individual segments, the straight segments having generally the same length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic device, comprising:
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a conductive circuit having a first conducting arm and a second conducting arm, a first end of the first conducting arm forming a first terminal and a second end of the second conducting arm forming a second terminal; a capacitive element having a first conducting surface and a second conducting surface spaced apart from the first conducting surface by a gap, the first and second conducting surfaces being on a common layer as the first and second conducting arms of the conductive circuit, the first conducting surface being coupled to the first conducting arm at the first terminal, the second conducting surface being coupled to the second conducting arm at the second terminal; and wherein at least one of the first and second conducting arms, the first and second conducting surfaces, and the gap includes a portion shaped as a space-filling curve having a plurality of connected straight segments spatially arranged so that none of the adjacent and connected segments form a straight segment longer than the individual segments. - View Dependent Claims (11, 12, 13, 14)
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15. An identification device, comprising:
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an electromagnetic sensor configured as a dipole having a first terminal and a second terminal spaced apart from the first terminal; a generally planar capacitor on a common layer as the electromagnetic sensor; and wherein at least a portion of at least one of the electromagnetic sensor and the capacitor includes a portion shaped as a space-filling curve having a plurality of connected straight segments spatially arranged so that none of the adjacent and connected segments form a straight segment longer than the individual segments. - View Dependent Claims (16)
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Specification