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Sensors 2017, 17(7), 1576; doi:10.3390/s17071576

Multiport Circular Polarized RFID-Tag Antenna for UHF Sensor Applications

1
Institut National de la Recherche Scientifique Centre Centre Énergie Matériaux Télécommunications 800, De La Gauchetière Ouest Bureau 6900, Montréal, QC H5A 1K6, Canada
2
IES-UMR CNRS 5214 Université de Montpellier, 34095 Montpellier Cedex 5, France
*
Author to whom correspondence should be addressed.
Received: 31 March 2017 / Revised: 27 June 2017 / Accepted: 30 June 2017 / Published: 5 July 2017
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Canada 2017)
View Full-Text   |   Download PDF [8690 KB, uploaded 7 July 2017]   |  

Abstract

A circular polarized patch antenna for UHF RFID tag-based sensor applications is presented, with the circular polarization (CP) generated by a new antenna shape, an asymmetric stars shaped slotted microstrip patch antenna (CP-ASSSMP). Four stars etched on the patch allow the antenna’s size to be reduced by close to 20%. The proposed antenna is matched with two RFID chips via inductive-loop matching. The first chip is connected to a resistive sensor and acts as a sensor node, and the second is used as a reference node. The proposed antenna is used for two targets, serving as both reference and sensor simultaneously, thereby eliminating the need for a second antenna. Its reader can read the RFID chips at any orientation of the tag due to the CP. The measured reading range is about 25 m with mismatch polarization. The operating frequency band is 902–929 MHz for the two ports, which is covered by the US RFID band, and the axial-ratio bandwidth is about 7 MHz. In addition, the reader can also detect temperature, based on the minimum difference in the power required by the reference and sensor. View Full-Text
Keywords: radio frequency identification (RFID); ultra-high frequency; reading range; sensor; passive tag antenna; multiport; circular polarization radio frequency identification (RFID); ultra-high frequency; reading range; sensor; passive tag antenna; multiport; circular polarization
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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. (CC BY 4.0).

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MDPI and ACS Style

Zaid, J.; Abdulhadi, A.; Kesavan, A.; Belaizi, Y.; Denidni, T.A. Multiport Circular Polarized RFID-Tag Antenna for UHF Sensor Applications. Sensors 2017, 17, 1576.

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