Compact UWB Millimeter Wave MIMO Antenna Design and Analysis

This paper discusses the development of a compact ultra-wideband (UWB) antenna for millimeter wave MIMO application. The main advantage of the proposed antenna lies in its utilization of a straightforward design consisting of an oval shape with rectangular slots, which leads to a bandwidth of 13 GHz spanning from 24.5 GHz to 37.5 GHz with peak gain of 6.57 dBi. The antenna is developed on Rogers RT5880 substrate with partial ground, and the total size of 30 × 35 mm
²
. To test the performance of the antenna, a six-port UWB MIMO antenna system is applied. This system incorporates six antennas positioned orthogonally to ensure high isolation throughout the entire operating frequency range. From the results, the system shows mutual coupling between the ports at lower than −13.5 dB. The performance of the antenna is discussed in terms of its envelope correlation coefficient (ECC), diversity gain (DG), and its total active reflection coefficient (TARC), where all the simulated result shows values within the appropriate range of MIMO antennas.