Mutual Coupling Reduction through Defected Ground Structure in Circularly Polarized, Dielectric Resonator-Based MIMO Antennas for Sub-6 GHz 5G Applications

Anwar Ali; Jijun Tong; Javed Iqbal; Usman Illahi; Abdul Rauf; Saeed Ur Rehman; Haider Ali; Muhammad Mansoor Qadir; Muhammad Amir Khan; Rania M Ghoniem

doi:10.3390/mi13071082

Mutual Coupling Reduction through Defected Ground Structure in Circularly Polarized, Dielectric Resonator-Based MIMO Antennas for Sub-6 GHz 5G Applications

Micromachines (Basel). 2022 Jul 8;13(7):1082. doi: 10.3390/mi13071082.

Authors

Anwar Ali¹, Jijun Tong¹, Javed Iqbal^{2

3}, Usman Illahi^{2

3}, Abdul Rauf⁴, Saeed Ur Rehman⁵, Haider Ali⁶, Muhammad Mansoor Qadir⁷, Muhammad Amir Khan⁸, Rania M Ghoniem⁹

Affiliations

¹ School of Information Science and Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China.
² School of Electrical and Electronic Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia.
³ Electrical Engineering Department, Gomal University, Dera Ismail Khan 29050, Pakistan.
⁴ Department of Electrical Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan.
⁵ Electrical Engineering Department, Attock Campus, Comsats University Islamabad, Abbottabad 22060, Pakistan.
⁶ Department of Electrical and Electronics Engineering Technology, University of Technology, Nowshera 24100, Pakistan.
⁷ Department of Computer Science, Iqra National University, Peshawar 25000, Pakistan.
⁸ Department of Computer Science, Islamabad-Abbottabad Campus, COMSATS University, Abbottabad 22060, Pakistan.
⁹ Department of Information Technology, College of Computer and Information Sciences, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.

Abstract

This paper describes a singly-fed circularly polarized rectangular dielectric resonator antenna (RDRA) for MIMO and 5G Sub 6 GHz applications. Circular polarization was achieved for both ports using a novel-shaped conformal metal strip. To improve the isolation between the radiators, a "S" shaped defective ground plane structure (DGPS) was used. In order to authenticate the estimated findings, a prototype of the suggested radiator was built and tested experimentally. Over the desired band, i.e., 3.57-4.48 GHz, a fractional impedance bandwidth of roughly 36.63 percent (-10 dB as reference) was reached. Parallel axial ratio bandwidth of 28.33 percent is achieved, which is in conjunction with impedance matching bandwidth. Between the ports, isolation of -28 dB is achieved Gain and other far-field parameters are also calculated and found to be within their optimum limits.

Keywords: 5G NR band; circular polarization; defected ground structure; dielectric resonator antenna (DRA); multiple-input-multiple-output (MIMO); singly-fed.

Grants and funding

Princess Nourah bint Abdulrahman University Researchers Supporting Project number (PNURSP2022R138), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia.