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Effects of a Metal Plane on a Meandered Slot Antenna for UHF RFID Applications

  • Kim, Ji-Kwon ;
  • Oh, Il-Young ;
  • Koo, Tae-Wan ;
  • Kim, Jun-Chul ;
  • Kim, Dong-Su ;
  • Yook, Jong-Gwan
  • Received : 2012.05.02
  • Accepted : 2012.06.05
  • Published : 2012.06.30

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.

Keywords

RFID;Mutual Impedance;Metal Effects;Friis Transmission Equation;Slot Antenna

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Cited by

  1. A NOVEL UHF RFID SLOT COUPLED METALLIC TAG ANTENNA FOR STEEL-BAR APPLICATIONS vol.46, 2014, https://doi.org/10.2528/PIERC13101101
  2. Artificial magnetic conductor loaded long-range passive RFID tag antenna mountable on metallic objects vol.50, pp.5, 2014, https://doi.org/10.1049/el.2013.2671
  3. Analysis of Flip Chip Bonding for Performance Stability of UHF RFID Tags vol.4, pp.10, 2014, https://doi.org/10.1109/TCPMT.2014.2345614

Acknowledgement

Supported by : NIPA (National IT Industry Promotion Agency)