A Circular Polarization MIMO Antenna using Sequentially Rotated Feeding Network for WLAN Applications

Authors

Keywords:

Aperture coupling feed, MIMO antenna, wireless local network area, circular polarized antenna, sequentially rotated feeding

Abstract

This work presents a wideband circularly polarized (CP) MIMO antenna operating around 5.5 GHz. The design consists of two identical 2 × 2 subarrays using aperture-coupled microstrip elements. A 5 mm air gap between substrates is introduced to enhance impedance bandwidth, while a sequential phase feeding network ensures stable CP performance across a wide frequency range. The antenna is analyzed through fullwave simulation software of CST Studio Suite and validated by measurements on a fabricated prototype. Results show a 62.9% impedance bandwidth (4.21–7.67 GHz) and a 40% 3-dB axial ratio bandwidth (5.1–7.3 GHz). The antenna achieves a peak gain of 11.5 dBi with inter-element isolation exceeding 25 dB. These results demonstrate its suitability for wideband CP MIMO applications.

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Author Biographies

Ngoc-Lan Nguyen, Posts and Telecommunications Institute of Technology

Ngoc-Lan Nguyen (Member, IEEE) received Master and PhD degrees in the School of Electronics and Telecommunications, Hanoi University of Science and Technology, in 2014 and 2019, respectively. Currently, she is a lecturer at the Faculty of Telecommunications 2, Posts and Telecommunications Institute of Technology, Ho Chi Minh City, Vietnam. Her research interests include microstrip antennas, mutual coupling, MIMO antennas, array antennas, reconfigurable antennas, polarization antennas, metamaterial, and metasurface, intelligent reflecting surfaces, and wireless communication technology.

Dang-Khoa Ho, Posts and Telecommunications Institute of Technology

Dang-Khoa Ho is a final-year student majoring in Electronics and Telecommunications at the Posts and Telecommunications Institute of Technology. His research interests include microstrip patch antennas, polarized antennas, and multiband antenna design.

Quoc-Hung Bui, Posts and Telecommunications Institute of Technology

Quoc-Hung Bui is a final-year student at the Posts and Telecommunications Institute of Technology, majoring in Electronics and Telecommunications. His direction of research is the development of microstrip patch antennas, with a specific interest in polarization techniques and multiband antenna architectures.

Tan Dao-Duc, Phenikaa University

Tan Dao-Duc is a faculty member and researcher at the Faculty of Electrical and Electronic Engineering, part of the PHENIKAA School of Engineering at PHENIKAA University in Hanoi, Vietnam. He graduated from Hanoi University of Science and Technology in 2015 with a degree in Electrical and Electronics Engineering. His academic expertise and primary research interests are cantered on microwave engineering, applied antenna design, and wave propagation. Through his work at PHENIKAA University, he focuses on advancing electromagnetic technologies and developing innovative antenna systems, contributing to the broader fields of modern wireless communications and radio frequency engineering.

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Published

2026-08-30

How to Cite

Nguyen, N.-L., Ho, D.-K., Bui, Q.-H., & Dao-Duc, T. (2026). A Circular Polarization MIMO Antenna using Sequentially Rotated Feeding Network for WLAN Applications. IEEE Latin America Transactions, 24(10), 1190–1199. Retrieved from https://latamt.ieeer9.org/index.php/transactions/article/view/10849

Issue

Vol. 24 No. 10 (2026): Ordinary Issue

Section

Electronics