Flat loop antenna in a single plane for use in radio frequency identification tags
First Claim
1. A loop antenna comprising:
- a substrate having a first surface and an opposing second surface, and a peripheral area;
a pair of terminals disposed on said first surface of said substrate, said terminals being positioned at a distance from each other no greater than a predetermined maximum separation; and
a continuous wire loop having two ends and a length between said two ends, each of said ends coupled to a different one of said pair of terminals, said conductive loop being disposed only on said first surface of said substrate in a serpentine pattern, without being disposed through said substrate and without self-crossing, so that said length of said loop is increased multiple times relative to a net fixed area enclosed within said loop, said serpentine pattern forming multiple coiled subloops in and substantially filling at least a portion of said peripheral area of said substrate.
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Accused Products
Abstract
A flat compact loop pattern provides an antenna for radio frequency identification tags with an enhanced voltage and/or current across two closely adjacently spaced terminals which are disposed on the same side of an insulating substrate. The amount of voltage supplied by the antenna loop to the RFID tag depends not only on the surface area included within the loop but also on the length of the planar loop or winding. The loop is comprised of a serpentine non-crossing wire disposed all on one side of the substrate, typically in the pattern of either a raster patterns in areas adjacent to one or more of the sides of the rectangular substrate, or a radial array of loops extending between the periphery and center of the substrate as the loops are azimuthally advanced around the center like spokes on a wheel or slices of pie.
177 Citations
19 Claims
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1. A loop antenna comprising:
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a substrate having a first surface and an opposing second surface, and a peripheral area; a pair of terminals disposed on said first surface of said substrate, said terminals being positioned at a distance from each other no greater than a predetermined maximum separation; and a continuous wire loop having two ends and a length between said two ends, each of said ends coupled to a different one of said pair of terminals, said conductive loop being disposed only on said first surface of said substrate in a serpentine pattern, without being disposed through said substrate and without self-crossing, so that said length of said loop is increased multiple times relative to a net fixed area enclosed within said loop, said serpentine pattern forming multiple coiled subloops in and substantially filling at least a portion of said peripheral area of said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An antenna pattern for use on a single surface of an insulated substrate having a perimeter comprising:
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a first and second conductive terminal disposed on said single surface, said first and second terminals being adjacent to each other and separated by not more than a pre-determined maxim separation distance; and a continuous serpentine wire disposed on said surface without crossing itself and extending from said first to said second terminal to form a continuous, conductive path there between, said surface having a perimeter, said serpentine wire having a length between said first and second terminals exceeding said perimeter of said substrate, said serpentine wire forming multiple coiled subloops in and substantially filling at least one peripheral area of said substrate included within said perimeter. - View Dependent Claims (10, 11, 12, 13)
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14. An antenna pattern for with an RFID tag comprising:
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a single surface with an insulated surface, said single surface having at least one peripheral area; closely adjacent first and second conductive terminal disposed on said insulated surface; and a continuous wire loop disposed on said surface in a pattern folded on itself a plurality of times without crossing itself and extending from said first said second terminal to form a continuous, conductive path therebetween, said loop having two opposing ends, said ends being coupled to said first and second conductive terminals, said pattern forming multiple coiled subloops in and substantially filling said at least one peripheral area. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification