RFID tag with small aperture antenna
First Claim
1. A RFID tag to be attached to an object to identify the object or a characteristic or feature thereof from data stored in the tag accessible by a RFID reader, said RFID tag comprising a relatively flat structure having a small aperture antenna positioned on or proximate the tag in the form of a polygon having electrically conductive sides.
3 Assignments
0 Petitions
Accused Products
Abstract
A RFID tag to be attached to an object to identify the object or a characteristic or feature thereof from data stored in the tag accessible by a RFID reader includes a relatively flat structure having a small aperture antenna positioned on or proximate the tag in the form of a polygon having electrically conductive sides. The flat structure, which may be fabricated as a sticker or label, incorporates a small aperture antenna, such as a slot antenna, in the form of a polygon having electrically conductive sides. The polygon may be triangular, rectangular, square, elliptical, circular, or other polygonal figure depending on number of its plurality of sides. A constitutes the aperture of the antenna. An integrated circuit chip containing the electronics of the tag is secured to the flat structure within the boundary of the aperture constituting the central open portion within the polygon, and substantially equidistant from a pair of opposite sides of the polygon, with a pair of conductive impedance matching elements of substantially equal length confronting each other in the aperture from the opposite sides. Methods of use are disclosed.
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Citations
46 Claims
- 1. A RFID tag to be attached to an object to identify the object or a characteristic or feature thereof from data stored in the tag accessible by a RFID reader, said RFID tag comprising a relatively flat structure having a small aperture antenna positioned on or proximate the tag in the form of a polygon having electrically conductive sides.
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25. A radio frequency identification (RFID) tag, comprising:
- a flat structure with an integrated circuit (IC) chip containing electronic circuitry of said tag on a major side and a small aperture antenna in the shape of a polygon with a central aperture on the other major side, and an impedance matching circuit with elements on both sides operatively connected between said antenna and said IC chip for complex impedance matching between the two.
- View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
- 33. A method of enabling a vehicle to be detected automatically as being authorized for passage through a restricted lane equipped with a RFID reader, which comprises the step of making available to the vehicle a RFID tag in the form of a planar compact sticker that incorporates a storage medium programmed with authorization data that identifies the vehicle as being permitted to pass through said lane without stopping, said sticker further including a small aperture antenna implemented as a polygon with central aperture for optimized communication of the stored authorization data from said antenna in a backscatter RF signal in response to an interrogating RF signal from said RFID reader when within RF communication range of said RFID tag.
- 41. An antenna configuration, comprising a small aperture antenna formed as a polygon having electrically conductive sides on a major surface of an electrically insulative sheet, and at least a portion of an impedance matching circuit on said surface electrically connected to said polygon for coupling said antenna to a load, for substantial impedance matching over a band of frequencies in which said antenna is designed to operate.
Specification