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J. Electromagn. Eng. Sci > Volume 11(1); 2011 > Article
Journal of the Korean Institute of Electromagnetic and Science 2011;11(1):1-4.
DOI: https://doi.org/10.5515/JKIEES.2011.11.1.001   
Design of a Flexible Planar RFID Tag Antenna with Low Performance Degradation from Nearby Target Objects
Jae-Yul Choo1, Jeong-Ki Ryoo2, Ho-Sung Choo3
1Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
2RFID Research Lab., LS Industrial Systems Co., Ltd.
3School of Electronic and Electrical Engineering, Hongik University
In this letter, we propose a novel tag antenna that has low performance degradation with nearby dielectric material. We obtained a stable reading performance and a broad matching bandwidth on nearby dielectric materials by employing a T-matching network with thick line width and capacitively slot-loaded arms. We then built the proposed antenna and measured the tag sensitivity to examine the reading characteristics with nearby dielectric materials. The measured results clearly demonstrate stable tag sensitivity with various nearby dielectric materials, such as foam, acrylic-plastic, glass, and ceramic plates. To more closely observe the antenna characteristics with nearby dielectric materials, we also examined the impedance variation and surface current distribution with respect to the dielectric constant of nearby target objects, which ranged from $1{times}{varepsilon}_0$ to $16{times}{varepsilon}_0$.
Key words: UHF RFID Tag, Stable Reading Performance, Tag Sensitivity
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