In passive ultra-high frequency (UHF) radio frequency identification (RFID) systems the radar cross section (RCS) of the tag is an important factor affecting the performance of the system. One of the most challenging applications for passive UHF RFID systems is identification of industrial paper reels. In this paper we study the RCS of RFID tag antennas for paper reel identification with finite element method (FEM) modelling. In addition, the operation of one of the studied tags is verified and analyzed with read range and RFID signal measurements in the practical application environment.
[Show abstract][Hide abstract] ABSTRACT: This paper presents a method for measuring signal backscattering from RFID tags, and for calculating a tag's radar cross section (RCS). We derive a theoretical formula for the RCS of an RFID tag with a minimum-scattering antenna. We describe an experimental measurement technique, which involves using a network analyzer connected to an anechoic chamber with and without the tag. The return loss measured in this way allows us to calculate the backscattered power and to find the tag's RCS. Measurements were performed using an RFID tag operating in the UHF band. To determine whether the tag was turned on, we used an RFID tag tester. The tag's RCS was also calculated theoretically, using electromagnetic simulation software. The theoretical results were found to be in good agreement with experimental data
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