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Spatially Confined UHF RFID Detection with a Metamaterial Wire Grid

Morgado, T. A. ; Alves, J. A. ; Marcos, J. ; Maslovski , S. ; Costa, J.R. ; Fernandes, C. A. ; Silveirinha, M. G.

IEEE Trans. on Antennas and Propagation Vol. 62, Nº 1, pp. 378 - 384, January, 2014.

ISSN (print): 0018-926X
ISSN (online): 0018-926X

Journal Impact Factor: 2,181 (in 2014)

Digital Object Identifier: 10.1109/TAP.2013.2287027

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Abstract
The confinement of the detection region is one of the most challenging issues inUltra-High Frequency (UHF) Radio Frequency Identification (RFID) systems.Here, we propose a new paradigm to confine the interrogation zone of standard UHF RFID systems. Our approach relies on the use of an all-planar metamaterial wire grid to block the radiation field (i.e., the far-field) of the reader antenna, and thereby obtain a spatially well-confined detection region in the near-field. This solution is analytically and numerically investigated, and then experimentally verified through near-field and tag-reading measurements, demonstrating its effectiveness and robustness under external perturbations.