Abstract
In this work, RFID readers and active tags, operating at 2.4GHz and 5.8GHz, are simulated to calculate the electromagnetic fleld distribution generated in their surroundings, considering the presence of the user's body and possible scattering obstacles, and including the analysis of the speciflc absorption rate (SAR) in the human models (which can be very close to the tag). The flnite-difierence time-domain (FDTD) method and the flnite elements (FE) method are used. Results show that signiflcant fleld level can be found in regions far from the tag-reader direction. This fact could constitute a risk because of the possible presence of general public and eventual eavesdroppers. Nevertheless, the calculated values of SAR are always below the basic restrictions.
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