Design of Integrated Polygonal UWB MIMO Antenna With EBG Structure Based on Characteristic Mode Analysis

Authors

  • Fukuan Zhang School of Electrical and Information Engineering Anhui University of Science and Technology, Huainan 232001, China
  • Zhonggen Wang School of Electrical and Information Engineering Anhui University of Science and Technology, Huainan 232001, China
  • Wenyan Nie School of Mechanical and Electrical Engineering Huainan Normal University, Huainan 232001, China
  • Ming Yang School of Electrical and Communications Engineering West Anhui University, Lu’an 237012, China
  • Chenlu Li School Electrical and Information Engineering Hefei Normal University, Hefei 230061, China

DOI:

https://doi.org/10.13052/2025.ACES.J.400502

Keywords:

Characteristic mode theory, EBG, MIMO antenna, T-slot, UWB antenna

Abstract

This paper presents an analytical design of an integrated polygonal ultra-wideband (UWB) MIMO antenna, featuring a stepped electromagnetic band gap (EBG) integrated with a T-shaped stepped stub and utilizing characteristic mode analysis (CMA). The overall size of the antenna is 27×22×0.8 mm3. It comprises two symmetric octagonal radiating units, a T-shaped stepped floor, and an EBG structure positioned between the two radiating units. By analyzing the current and electric field distributions of the antenna’s characteristic modes, the feed point is identified at the rectangular microstrip line of the radiating unit, ensuring the simultaneous excitation of the antenna’s eight characteristic modes to achieve ultra-broadband characteristics. Meanwhile, the characteristic mode theory offers clear physical insights into antenna optimization. The bandwidth is improved by etching three positive T-slots on the floor. In comparison, the antenna isolation is enhanced by employing the EBG structure to suppress coupling currents and etching two inverted T-slots to modify the current path. Simulation and measurement results show that the antenna covers the 3.06-14 GHz band with isolation exceeding 20 dB. The antenna exhibits excellent radiation performance and a low envelope correlation coefficient (ECC).

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Author Biographies

Fukuan Zhang, School of Electrical and Information Engineering Anhui University of Science and Technology, Huainan 232001, China

Fukuan Zhang received the B.E. degree from Anhui University of Science and Technology in 2023. He is currently pursuing the M.S degree at Anhui University of Science and Technology. His current research interests include the theory and design of UWB MIMO antenna based on characteristic mode analysis.

Zhonggen Wang, School of Electrical and Information Engineering Anhui University of Science and Technology, Huainan 232001, China

Zhonggen Wang received the Ph.D. degree in electromagnetic field and microwave technique from the Anhui University of China (AHU), Hefei, P.R. China, in 2014. Since 2014, he has been with the School of Electrical and Information Engineering, Anhui University of Science and Technology. His research interests include computational electromagnetics, array antennas, and reflect arrays.

Wenyan Nie, School of Mechanical and Electrical Engineering Huainan Normal University, Huainan 232001, China

Wenyan Nie is a professor at Huainan Normal University. She received the B.S. and M.S degrees from Anhui University of Science and Technology in 2007 and 2012, respectively. Her research interests include computational electromagnetic methods, and antenna theory and design.

Ming Yang, School of Electrical and Communications Engineering West Anhui University, Lu’an 237012, China

Ming Yang received the B.S. degree from Huaibei Normal University in 2005, and the M.S. and Ph.D. degrees in electromagnetic field and microwave technology from Anhui University, Hefei, China, in 2010 and 2019, respectively. He is currently the Deputy Director of the School of Electronics and Information Engineering, at West Anhui University, Lu’an, China. He is the author and co-author of about 20 scientific papers published in journals and presented at international conferences in the field of antenna design. His current research interests include MIMO antennas for hand-held devices, SIW antennas, base station antennas, multi-band antennas, millimeter wave antennas, and antenna array design.

Chenlu Li, School Electrical and Information Engineering Hefei Normal University, Hefei 230061, China

Chenlu Li received the Ph.D. degree from Anhui University in 2017. She is currently working at Hefei Normal University. Her research interests include electromagnetic scattering analysis of targets and filtering antenna design.

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Published

2025-05-30

How to Cite

[1]
F. . Zhang, Z. . Wang, W. . Nie, M. . Yang, and C. . Li, “Design of Integrated Polygonal UWB MIMO Antenna With EBG Structure Based on Characteristic Mode Analysis”, ACES Journal, vol. 40, no. 05, pp. 390–400, May 2025.

Issue

2025: Vol 40 Iss 5

Section

General Submission

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