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Sensors 2017, 17(7), 1576;

Multiport Circular Polarized RFID-Tag Antenna for UHF Sensor Applications

Institut National de la Recherche Scientifique Centre Centre Énergie Matériaux Télécommunications 800, De La Gauchetière Ouest Bureau 6900, Montréal, QC H5A 1K6, Canada
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)
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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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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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