A MIMO Antenna with Slotted Ground Plane for 5G Millimeter Waves Communication Systems

This paper presents a four-element multiple-input multiple-output (MIMO) antenna with slotted ground plane and patch for 5G millimeter waves communication systems. It is designed using Computer Simulation Technology (CST) software on Rogers RT/Duriod 5880 with a thickness and dielectric constant of 0.787mm and 2.2, respectively. The inset feeding technique is applied to obtain the matching impedance of 50Ω. The overall size of the antenna is 48×12×0.787mm
³
, and the dimensions of the slots on the ground plane and patch are determined through applying the empirical Hill Climbing algorithm to achieve an enhanced bandwidth and gain. It resonates at 26.455GHz with a reflection coefficient of -65.09dB and provides a huge bandwidth of 4.468GHz in the range of 23.37GHz - 27.838GHz at S
₁₁
≤ -10dB. It also achieves a mutual coupling of less than -32dB without utilizing a decoupling structure or extra spacing. In addition, other MIMO antenna parameters such as Envelope Correlation Coefficient (ECC), Diversity-Gain (DG), and Channel Capacity Loss (CCL) are evaluated which satisfy 5G systems requirements.