Effect of materials properties on performance of MIMO antennas

Rapid developments of low-profile, lightweight, and cost-effective antennas for wireless equipment have created a new obstacle for telecommunications designers. This article presents the design of a two-port multi-input and multi-output (MIMO) antenna with a single element operating at frequencies from 22 to 100 GHz. Using Computer simulation technology (CST) was utilized to simulate the antenna. In addition, a comparative analysis was conducted between various substrate materials, revealing diverse outcomes based on identical parameters. The main purpose of this study is to determine the most suitable materials for the layers of the proposed antenna that produce ideal results. The best results for all parameters were obtained using the Rogers RT-Duroid 5880 material for the substrate and copper material for the patch and ground layers. Specifically, the efficiency is 90.20206% with a gain of 11.60357 dBi. The mutual coupling coefficient (MCC) between the ports is -45.27243 dB, the envelope correlation coefficient (ECC) is 2.869467e-09, the diversity gain (DG) is 10 dB, and the voltage standing wave ratio (VSWR) is 1. Therefore, the antenna is more suitable for modern 5G and 6G wireless systems. Most importantly, the results showed that materials differ in electrical conductivity, so material properties are crucial in enhancing antenna manufacturing.