Multiport Circular Polarized RFID-Tag Antenna for UHF Sensor Applications
AbstractA 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
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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.
Zaid J, Abdulhadi A, Kesavan A, Belaizi Y, Denidni TA. Multiport Circular Polarized RFID-Tag Antenna for UHF Sensor Applications. Sensors. 2017; 17(7):1576.Chicago/Turabian Style
Zaid, Jamal; Abdulhadi, Abdulhadi; Kesavan, Arun; Belaizi, Yassin; Denidni, Tayeb A. 2017. "Multiport Circular Polarized RFID-Tag Antenna for UHF Sensor Applications." Sensors 17, no. 7: 1576.
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