Design of a Novel Circularly Polarized MIMO Antenna with Enhanced Isolation for Ultra-wideband Communication

Authors

  • Lei Zhang School of Information Science and Technology Southwest Jiaotong University, Chengdu 610031, China
  • Quanyuan Feng School of Information Science and Technology Southwest Jiaotong University, Chengdu 610031, China
  • Muhammad K. Khan School of Information Science and Technology Southwest Jiaotong University, Chengdu 610031, China

DOI:

https://doi.org/10.13052/2022.ACES.J.370510

Keywords:

Circular polarization (CP), compact, enhanced bandwidth, high isolation, multiple input and multiple output (MIMO), ultra-wideband (UWB)

Abstract

In this paper, we propose a circularly polarized (CP) ultra-wideband (UWB) MIMO antenna. Compared with common linearly polarized (LP) UWB antenna, the proposed antenna can excite circular polarization (CP) mode for WLAN communication and its impedance bandwidth can also fully cover UWB spectrum. It consists of identical circularly polarized antennas. Each unit adopts circular monopole with extended orthogonal rectangle patch to realize broadband and symmetrical rectangular ground with slot in the diagonal of each antenna unit to achieve circular polarization for WLAN band. It has a very compact size and the dimension is 25 × 51 × 0.8 mm3. The impedance bandwidth of the proposed antenna is from 3.1 GHz to 13.5 GHz, with average gain of 4 dBi, fully covering UWB bandwidth and enhanced by 38%. At the same time, circular polarization is achieved by embedding two symmetrical rectangular slot structures in the two opposite corners of every antenna unit. The extended orthogonal rectangle patch is introduced to enhance impedance bandwidth and broaden axial ratio (AR) bandwidth. The measured 3 dB axial ratio (AR) bandwidth is 1.8 GHz (4.7-6.5 GHz), fully covering WLAN band. Meanwhile, the slit slot between antenna units and rectangular openings are introduced to achieve high isolation. The proposed antenna keeps ECC (envelope correlation coefficient) below 0.01, which showing good isolation and diversity characteristics. The proposed antenna can simultaneously operate in the UWB spectrum and exhibit circularly polarized (CP) radiation characteristic in WLAN.

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Author Biographies

Lei Zhang, School of Information Science and Technology Southwest Jiaotong University, Chengdu 610031, China

Lei Zhang was born in Jiangsu, China. He received his B.S. degree in Electronic Information Engi-neering from Yanshan University, Qinghuangdao, China, in 2020. Now, he is pursuing his M.S. degree in Information and Communication Engineering at Southwest Jiaotong University, Chengdu, China. His major research is in miniaturized antenna, RFID technology, ultra-wideband communication, and MIMO technology.

Quanyuan Feng, School of Information Science and Technology Southwest Jiaotong University, Chengdu 610031, China

Quanyuan Feng (M’06–SM’08) received the M.S. degree in Micro-electronics 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. To date, 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 research interests include integrated circuits design, RFID technology, embedded system, wireless communications, antennas and propagation, microwave & millimeter wave technology, smart information processing, electromagnetic compatibility and RF/ microwave devices & materials, etc.

Muhammad K. Khan, School of Information Science and Technology Southwest Jiaotong University, Chengdu 610031, China

Muhammad K. Khan has received his BS and Master degree from the COMSATS University Pakistan in 2011 and 2016 respectively. Now he is pursuing his PhD in Information and Communication engineering from Southwest Jiaotong University China. His research interests include electromagnetics and antennas especially in the design and optimization of antenna array, microstrip patch antennas, and ultra wideband antennas.

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Published

2022-11-14

How to Cite

[1]
L. . Zhang, Q. . Feng, and M. K. . Khan, “Design of a Novel Circularly Polarized MIMO Antenna with Enhanced Isolation for Ultra-wideband Communication”, ACES Journal, vol. 37, no. 05, pp. 607–618, Nov. 2022.