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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 509768, 5 pages
http://dx.doi.org/10.1155/2014/509768
Research Article

Small-Size Wearable High-Efficiency TAG Antenna for UHF RFID of People

Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague 6, Czech Republic

Received 3 February 2014; Accepted 13 March 2014; Published 10 April 2014

Academic Editor: Yingsong Li

Copyright © 2014 Milan Svanda and Milan Polivka. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper introduces a small-size, low-profile wearable radiator based on the coupled patches and vertically folded patches techniques for application as a tag antenna for identification of people in the European UHF RFID band. The electric field distribution comes out dominantly from the central coupling slot, and thus the electric properties of the radiator are almost unaffected by the human body to which the antenna is intended to be attached. Accordingly, with the relative size at 866 MHz  mm3), the antenna exhibits total efficiency better than 50%, even if it is attached directly to a person.