Broadband CPW-Fed Circularly Polarized Square Slot Antenna for Universal UHF RFID Handheld Reader

Authors

  • Rui Ma Department of Information Science and Technology Southwest Jiaotong University, Chengdu, 611756, China
  • Quanyuan Feng Department of Information Science and Technology Southwest Jiaotong University, Chengdu, 611756, China

Keywords:

Circularly polarized, CPW-fed, handheld reader, UHF RFID

Abstract

This paper presents a new coplanar waveguide (CPW)-fed circularly polarized square slot antenna (CPSSA). The proposed antenna uses an inverted Z-shaped feedline protruded from the signal line of the feeding CPW. Circularly polarized (CP) radiation can be achieved by adequately inserting the arc-shaped grounded strip into the upper right corner of the square slot. The widened vertical tuning stub on the L-shaped grounded strip can improve impedance matching and axial ratio (AR) performance. The measured results indicate that the 10 dB impedance bandwidth is 620 MHz (652-1272 MHz), and the 3 dB axial ratio bandwidth is 320 MHz (840-1160 MHz), which has a broadband characteristic. In the range of the universal UHF RFID band, the measured peak gain is about 4.4 dBi. The proposed CPSSA uses low-cost FR4 material as the dielectric substrate. The overall size of the antenna is 119 × 119 × 0.5 mm3. The proposed antenna has a simple structure, easy processing, good performance, wide operating bandwidth, and dual circular polarization characteristic. It can be applied to the universal UHF RFID handheld reader environment.

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Author Biographies

Rui Ma, Department of Information Science and Technology Southwest Jiaotong University, Chengdu, 611756, China

Rui Ma was born in Ziyang, Sichuan, China, in 1997. She is currently working toward the Master's degree in Information and Communication Engineering at Southwest Jiaotong University (SWJTU), Chengdu, China. Her main research interests include antenna design and theory, especially in RFID circularly polarized reader antennas.

Quanyuan Feng, Department of Information Science and Technology Southwest Jiaotong University, Chengdu, 611756, China

Quanyuan Feng (M’06–SM’08) received the M.S. degree in Microelectronics and Solid Electronics from the University of Electronic Science and Technology of China, Chengdu, China, in 1991, and the Ph.D. degree in EM Field and Microwave Technology from Southwest Jiaotong University, Chengdu, China, in 2000. He is the Head of Institute of Microelectronics, Southwest Jiaotong University, Chengdu, China. He has been honored as the “Excellent Expert” and the “Leader of Science and Technology” of Sichuan Province owing to his outstanding contribution. In recent 5 years, more than 500 papers have been published on IEEE Transactions on Antennas and Propagation, IEEE Transactions on Microwave Theory and Techniques, IEEE Antennas and Wireless Propagation Letters etc, among which more than 300 were registered by SCI and EI.
His current research interests include integrated circuits design, RFID technology, embedded system, wireless communications, antennas and propagation, microwave and millimeter wave technology, smart information processing, electromagnetic compatibility, RF/ microwave devices and materials etc.

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Published

2021-11-04

How to Cite

[1]
R. . Ma and Q. . Feng, “Broadband CPW-Fed Circularly Polarized Square Slot Antenna for Universal UHF RFID Handheld Reader”, ACES Journal, vol. 36, no. 06, pp. 747–754, Nov. 2021.

Issue

2021: Vol 36 Iss 6

Section

Articles