Patent ID: 7916033
Filing Date: 2011-03-29
Classification: G06K

Abstract:
1. A radio frequency identification (RFID) tag, comprising: a substrate comprised of a material with a high dielectric constant of greater than 4 and having a first side and a second side, a patch antenna mounted to said first side of said substrate; a metallic ground plane mounted to said second side of said substrate, said ground plane including a feed through hole; a metallic backplane coupled with said ground plane, on a side of said ground plane opposite said substrate, at least one of said backplane and said ground plane including a recess; an RFID circuit positioned within said recess; a shorting wall including a plurality of through holes extending through said substrate and interconnecting said antenna with said ground plane, said plurality of through holes being generally linearly arranged relative to each other along an edge of said ground plane; and an electrically conductive via extending through said substrate and said feed through hole of said ground plane, said via having a diameter which is less than said feed through hole, said via interconnecting said antenna with the RFID circuit, said via being at a distance from said shorting wall whereby an impedance of said RFID circuit at least substantially matches an impedance of said antenna.