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International Journal of Antennas and Propagation
Volume 2012, Article ID 905409, 8 pages
http://dx.doi.org/10.1155/2012/905409
Research Article

Performance of High-Permittivity Ceramic-Polymer Composite as a Substrate for UHF RFID Tag Antennas

1Rauma Research Unit, Department of Electronics, Tampere University of Technology, 26100 Rauma, Finland
2Micro and Nano Systems Research Group, Department of Automation Science and Engineering, Tampere University of Technology, 33720 Tampere, Finland
3Electrical Engineering Department, The University of Mississippi, University, MS 38677, USA

Received 12 December 2011; Accepted 4 April 2012

Academic Editor: Carles Fernández-Prades

Copyright © 2012 A. A. Babar et al. 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

A high-permittivity ceramic-polymer composite substrate is fabricated and proposed for its potential use in UHF RFID tags. The substrate is developed using high-permittivity Barium Titanate (BaTiO3) ceramic powder mixed with polydimethylsiloxane (PDMS) polymer. The resulting composite achieves a soft, hydrophobic, heat resistant, low loss, and flexible material with high dielectric constant. The percentage of the ceramic powder in the composite helps in achieving variable permittivity values. When this material is used as a substrate for a tag antenna, it will help the tag to be reduced in size, to conform to uneven or rough surface, and to be less vulnerable to breakage or other environmental damages. A small passive UHF RFID tag antenna is designed, fabricated, and attached to this type of composite substrate, to demonstrate the performance of this composite material.