Synergistic Mitigation of Mutual Coupling in Millimeter-Wave MIMO Arrays: A Hybrid DGS and EBG Paradigm for 5G Systems

Abstract

This paper presents the design and simulation of a 28 GHz MIMO microstrip antenna for 5G millimeter-wave communication. Beginning with design is extended to 1×2 configurations to enhance gain, directivity, return loss, and isolation. Defected Ground Structures (DGS) and Electromagnetic Band Gap (EBG) structures were employed to reduce mutual coupling. Simulations in ANSYS HFSS demonstrate that DGS improves isolation and enhances gain and directivity, while the inclusion of EBG provides further coupling suppression with a slight reduction in gain due to energy losses. These results indicate that combining DGS and EBG is an effective approach for compact 5G MIMO antennas, balancing isolation and radiation efficiency for high-speed wireless systems