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Sensors 2016, 16(7), 1150;

A High-Gain Passive UHF-RFID Tag with Increased Read Range

Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona (UAB), Campus UAB, Bellaterra, Barcelona 08193, Spain
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 14 June 2016 / Revised: 19 July 2016 / Accepted: 19 July 2016 / Published: 22 July 2016
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In this work, a passive ultra-high frequency radio-frequency identification UHF-RFID tag based on a 1.25 wavelengths thin dipole antenna is presented for the first time. The length of the antenna is properly chosen in order to maximize the tag read range, while maintaining a reasonable tag size and radiation pattern. The antenna is matched to the RFID chip by means of a very simple matching network based on a shunt inductance. A tag prototype, based on the Alien Higgs-3 chip, is designed and fabricated. The overall dimensions are 400 mm × 14.6 mm, but the tag width for most of its length is delimited by the wire diameter (0.8 mm). The measured read range exhibits a maximum value of 17.5 m at the 902–928 MHz frequency band. This represents an important improvement over state-of-the-art passive UHF-RFID tags. View Full-Text
Keywords: dipole antennas; impedance matching; radio-frequency identification (RFID) dipole antennas; impedance matching; radio-frequency identification (RFID)

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Zuffanelli, S.; Aguila, P.; Zamora, G.; Paredes, F.; Martin, F.; Bonache, J. A High-Gain Passive UHF-RFID Tag with Increased Read Range. Sensors 2016, 16, 1150.

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