Elongated twin feed line rfid antenna with distributed radiation perturbations
AssigneesWistron Neweb Corp., The Ohio State University Research Foundation
InventorsWalter D. Burnside, Robert J. Burkholder, Feng-Chi Eddie Tsai
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Abstract
An RFID antenna comprising an elongated structure existing along an axis that is long compared to the signal wavelength and including twin ribbon-like feed lines of electrically conductive material, the feed lines being in a common plane and being uniformly laterally spaced from one another, and a plurality of radiating perturbations associated with the feed lines at a plurality of locations spaced along the feed lines, at each location each feed line has its own individual perturbation or portion of a perturbation.
Claims44
An RFID antenna comprising an elongated structure existing along an axis that is long compared to the signal wavelength and including twin ribbon-like feed lines of electrically conductive material, the feed lines being in a common plane and being generally uniformly laterally spaced from one another at areas along the antenna length, and a plurality of radiating perturbations associated with the feed lines at a plurality of locations spaced along the feed lines, at each location each feed line having a perturbation.
An RFID antenna having twin feed lines extending along an axis and radiation perturbations associated with the feed lines spaced along the axis, the perturbations being arranged to radiate electric fields having polarized components parallel to the axis and orthogonal to the axis, the electric field component polarized orthogonally to the axis radiating in beams transverse to the axis and the parallel polarized field component radiating in beams at substantial angles from said transverse beams whereby the antenna is diverse in both the polarization and beam direction of its radiation.
An RFID antenna comprising a pair of twin feed lines extending along an axis, the feed lines comprising flat ribbon-like electrical conductors with a uniform gap size, the feed lines having a serpentine configuration crossing back and forth across the axis, a plurality of radiation stubs associated with the feed lines, the stubs being arranged in collinear pairs, each stub of a pair being associated with a single one of the feed lines, each stub pair extending at an angle to the axis from the feed line adjacent where the feed line crosses the axis.
An RFID antenna having coplanar feed lines and pairs of stubs, the feed lines extending along an axis, the stubs extending laterally from the feed lines in pairs such that each stub of a pair is associated with a single one of the feed lines, the stub pairs being distributed along the length of the feed lines, the feed lines and stubs being ribbon-like conductors sandwiched between a pair of low density dielectric panels.
An RFID antenna installation comprising a plurality of elongated antennas of essentially the same construction, an antenna being constructed in a flat elongated package with a feed end and a terminal end to produce electric field radiation with a component polarized parallel to an axis along the length of the antenna and a component polarized at right angles to the axis such that the resultant radiation polarization is at an angle with respect to the axis, the antennas being located parallel to one another and, with respect to one, the other being flipped over the axis 180° or being inverted end-for-end, or being flipped and inverted whereby a high degree of diversity of radiation signal polarization and beam direction is obtained in the zone intended to be illuminated by said antennas.
An RFID antenna for identifying objects present in a space including an RFID tag permanently attached to the antenna and having an identity unique to the antenna whereby a reader associated with the antenna can test the functionality of the antenna by determining whether or not the antenna detects the presence of its own integrated RFID tag.
Dependencies are inferred from the claim text.