Electromagnetic Characteristics of the RFID System in Proximity to Metal


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Abstract


The objective of this work was to investigate the fundamental electromagnetic characteristics of the Radio Frequency Identification systems i.e. RFID systems in proximity to metal in order to improve performance and/or range of RFID system. The simulation efforts have been concentrated on how the flux is affected by the metallic disc. A finite element electromagnetic model has been developed to predict magnetic field distribution. This model consisted of a reader coil, a circular metallic disc and a tag coil. Various configuration sets have been considered. For each configuration the magnetic field distribution of desired locations of RFID system has been calculated; taking the eddy currents into consideration. The obtained results have been presented and the performance of RFID tags in presence of metals was examined.
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Keywords


RFID; Inductive Coupling; EM Modeling; Finite Elements Method; Compatibility

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References


K. Finkenzelle, “RFID Handbook”, Hanser Verlag, 2003.

P.H. Cole, “Coupling and quality factors in RFID”, Proceeding of SPIE, Vol 4593, pp. 1-11, 2001.

F.A. Mohammadi, M.C.E. Yagoub, and K. Raahemifar, “Time-Domain 3D Electromagnetic Model for Hybrid and Monolithic Microwave and Optoelectronic Integrated Circuits”, Microwave and Optical Technology Letters, Vol. 43, No. 4, pp. 276-280, 2004.
http://dx.doi.org/10.1002/mop.20444

COMSOL Inc., “COMSOL Documentation, Modeling Guide,” Burlington, MA 01803, 2005.


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