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International Journal of Antennas and Propagation
Volume 2015, Article ID 870478, 6 pages
Research Article

Small Size and Low Cost UHF RFID Tag Antenna Mountable on Metallic Objects

Department of Telecommunication and System Engineering, Escola Tècnica Superior d’Enginyeria (ETSE), Universitat Autònoma de Barcelona (UAB), Campus de la UAB, Q Building, Carrer de les Sitges, Bellaterra, Cerdanyola del Vallès, 08193 Barcelona, Spain

Received 23 July 2015; Revised 9 October 2015; Accepted 12 October 2015

Academic Editor: Ahmed A. Kishk

Copyright © 2015 Sergio López-Soriano and Josep Parrón. 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.


Reducing tag size while maintaining good performance is one of the major challenges in radio-frequency identification applications (RFID), in particular when labeling metallic objects. In this contribution, a small size and low cost tag antenna for identifying metal objects in the European UHF band (865–868 MHz) is presented. The antenna consists of a transmission line mounted on an inexpensive thin dielectric which is proximity-coupled to a short-ended patch mounted on FR4 substrate. The overall dimensions of the tag are 33.5 × 30 × 3.1 mm. Experimental results show that, for an EIRP of 3.2 W (European regulations), such a small and cheap tag attains read ranges of about 5 m when attached to a metallic object.