A Compact Ultra-Wideband MIMO Antenna with Uniplanar EBG and Ground Stub for Mutual Coupling Reduction

A compact Multiple Input Multiple Output (MIMO) Ultra-Wide Band (UWB) antenna designed on a low - cost 0.8 mm thick FR-4 substrate is presented in this paper. The antenna comprises two identical patches in between which an Electromagnetic Band Gap (EBG) was placed to reduce mutual coupling. Similarly, a stub alongside partial ground was also employed to reduce mutual coupling on the ground plane. The design, simulation, and analysis of results were carried out in the HFSS (High Frequency Structural Simulator) Software environment. It has achieved a UWB impedance bandwidth up to 7.79 GHz from 3.18 GHz – 10.97 GHz, a peak gain of 9.6 dB at 7 GHz, good isolation between the antenna elements S
¹²
/S
²¹
<-25 dB, low ECC (Envelope Correlation Coefficient < 0.001) and a good radiation pattern.