volume | PIER Journals

2018-03-09

A Compact Wideband Slot Antenna for Universal UHF RFID Reader

Waleed Abdelrahim Ahmed,

Dr. Waleed Abdelrahim Ahmed

Southwest Jiaotong University

China

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Quanyuan Feng

Prof. Quanyuan Feng

School of Information Science and Technology

Southwest Jiaotong University

China

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Progress In Electromagnetics Research Letters, Vol. 73, 137-143, 2018

doi:10.2528/PIERL18010941

Abstract

A compact wideband circularly polarized square slot antenna for universal UHF RFID reader applications is proposed and tested. An L-shaped radiator at lower surface of the substrate is used to feed the proposed antenna. To achieve a broadband circular polarization (CP) and good performance, two rectangular stubs with different sizes are inserted at opposite corners of the square slot at the upper surface of the substrate. A small rectangular slit is used to improve the impedance matching of the proposed antenna. The antenna's measured <10-dB impedance bandwidth and measured 3-dB axial ratio bandwidth are 70.2% (660-1374 MHz) and 45.8% (796-1269 MHz), respectively. The proposed antenna has a dual circular polarization characteristic, wide impedance bandwidth, wide axial ratio, compact size, and maximum measured gain about 3.9 dBi. The total size of the proposed antenna is 120×120×1.6 mm³. Furthermore, the impedance bandwidth and axial ratio bandwidth of the proposed antenna cover the entire UHF RFID band easily. The proposed antenna is suitable for UHF RFID reader applications.

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Waleed Abdelrahim Ahmed, and Quanyuan Feng, "A Compact Wideband Slot Antenna for Universal UHF RFID Reader," Progress In Electromagnetics Research Letters, Vol. 73, 137-143, 2018.
doi:10.2528/PIERL18010941

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