Dual-Port Wideband MIMO Antenna with Pattern Diversity and High Isolation for mm-Wave 5G

This paper presents the design and analysis of a dual-port wideband multiple-input multiple-output (MIMO) antenna featuring pattern diversity and high isolation for millimeter-wave (mm-wave) 5G applications. The single antenna element of the proposed MIMO antenna module consists of a T-shape feed printed on one side of the RT duroid low-loss substrate and two rectangular slots loaded ground plane on the other side. The MIMO antenna designs have been realized using the anti-parallel arrangement of two antenna units relative to one another. The proposed MIMO has a small design of 12.5 x 6.25 x 0.8 mm³. The antiparallel arrangement is generating pattern diversity. The achieved impedance bandwidth ranges from 25.8 GHz to 32.8 GHz, including a total span of 7 GHz, which includes the critical band N257 (26.5-29.5 GHz) for 5G millimeter-wave communications. Wideband impedance matching is achieved by optimized feed geometry, guaranteeing steady performance over the designated mm-wave frequency range. High port isolation is achieved without intricate decoupling mechanisms, hence minimizing design complexity and preserving a small footprint. The simulation was conducted using the Ansys HFSS electromagnetic solver. The suggested MIMO antenna demonstrates a minimal envelope correlation coefficient (ECC) and substantial diversity gain (DG), and consistent gain patterns, making it an appropriate choice for next-generation high-speed wireless communication systems.