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http://dx.doi.org/10.5515/KJKIEES.2007.18.1.031

Analysis and Measurement of RCS for UHF Band RFID Tag Antennas  

Moon, Hyo-Sang (Department of Radio Engineering, Kyunghee University)
Kim, Nam-Hoon (Department of Radio Engineering, Kyunghee University)
Lee, Jong-Wook (Department of Radio Engineering, Kyunghee University)
Lee, Bom-Son (Department of Radio Engineering, Kyunghee University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.1, 2007 , pp. 31-36 More about this Journal
Abstract
In the RFID system, one of the important criteria of tag antenna performance is the detection distance. The most important factor determining the detection distance of the tag antenna is the Radar Cross Sections(RCS). In this paper, we propose a method to simply measure the RCS of the RFID tag antenna using two reader antennas(Tx and Rx) and a network analyzer. We estimate RCS' from the RCS equation based on the measured $S_{21}$ using the network analyzer. We compare the measured $S_{21}$ values with the calculated $S_{21}$ values and the simulated $S_{21}$ values using EM simulator. The used tag antennas are two kinds of dipole-type, metal-type, and an inductively-coupled type ones. In case of the dipole type, the measured, simulated and calculated values of the RCS are almost the same. In case of other types, we obtain the measured RCS values with a difference of about 3 dB.
Keywords
RFID; RCS; Measurement; Tag; Antenna;
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