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J Electromagn Eng Sci > Volume 12(2); 2012 > Article
Journal of Electromagnetic Engineering and Science 2012;12(2):176-184.
DOI: https://doi.org/10.5515/JKIEES.2012.12.2.176   
Effects of a Metal Plane on a Meandered Slot Antenna for UHF RFID Applications
Ji-Kwon Kim1, Il-Young Oh1, Tae-Wan Koo1, Jun-Chul Kim2, Dong-Su Kim2, Jong-Gwan Yook1
1Dept. of Electrical and Electronics Engineering, Yonsei University
2System Packaging Center of Korea Electronics Technology Institute
Abstract
In this paper, the effects of a metal plane on the performance of a meandered slot RFID antenna are evaluated in a real environment, and 3 metal plane cases are considered (the most likely scenarios in which metal conductive materials are placed near the tag antenna). The metal plane effects can be categorized as matching degradation and antenna gain variation. First, matching degradation due to the antenna's induced mutual impedance is experimentally investigated. In addition, the gain variation is investigated to figure out the change in the radiation characteristics. With the derived antenna parameters, the read range is calculated with the Friis transmission equation and measured to analyze the effects of a metal plane on RFID system performance. The calculated and measured read range varies from 9.3 m to 19.1 m as the distance between the RFID antenna and the metal plane changes.
Key words: RFID, Mutual Impedance, Metal Effects, Friis Transmission Equation, Slot Antenna

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