Abstract
In this paper, the performance of an RFID tag in presence of human body is studied. A commercial RFID tag is designed and simulated using CST Microwave Studio electromagnetic solver. Simulation results show good reflection coefficient and gain values for the RFID tag in free space. A human body model is then introduced and the performance of the tag as a function of the separation distance from body (Z) is investigated. It is found that the reflection coefficient presents considerable alterations at different separation distances. Results show that it is possible to predict a threshold distance Zth above which the RFID tag becomes detectable by the reader antenna.
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