Open Access

ARTICLE

4-Port Octagonal Shaped MIMO Antenna with Low Mutual Coupling for UWB Applications

Mahmoud A. Abdelghany^1,4, Mohamed Fathy Abo Sree², Arpan Desai³, Ahmed A. Ibrahim^4,*

1 Electrical Engineering Department, College of Engineering, Prince Sattam bin Abdulaziz University, Wadi Addwasir, 11991, Saudi Arabia
2 Electronic and Communication Department, Arab Academy for Science, Technology and Maritime Transport, Cairo, 11865, Egypt
3 Department of Electronics and Communication Engineering, CSPIT, Charotar University of Science and Technology (CHARUSAT), Changa, 388421, India
4 Electronics and Communications Engineering Department, Minia University, El-Minia, 61519, Egypt

* Corresponding Author: Ahmed A. Ibrahim. Email:

(This article belongs to the Special Issue: Green IoE for Smart 5G and beyond (5GB) Applications)

Computer Modeling in Engineering & Sciences 2023, 136(2), 1999-2015. https://doi.org/10.32604/cmes.2023.023643

Received 06 May 2022; Accepted 23 September 2022; Issue published 06 February 2023

Abstract

A 4-port multiple-input multiple-output (MIMO) antenna exhibiting low mutual coupling and UWB performance is developed. The octagonal-shaped four-antenna elements are connected with a 50 Ω microstrip feed line that is arranged rotationally to achieve the orthogonal polarization for improving the MIMO system performance. The antenna has a wideband impedance bandwidth of 7.5 GHz with S₁₁ < −10 dB from (103.44%) 3.5–11 GHz and inter-element isolation higher than 20 dB. Antenna validation is carried out by verifying the simulated and measured results after fabricating the antenna. The results in the form of omnidirectional radiation patterns, peak gain (≥4 dBi), and Envelope Correlation Coefficient (ECC) (≤0.01) are extracted to validate the suggested antenna performance. As well, time-domain analysis was investigated to demonstrate the operation of the suggested antenna in wideband applications. Finally, the simulated and experimental outcomes have almost similar tendencies making the antenna suitable for its use in UWB MIMO applications.

---

Graphic Abstract

---

Keywords

---