A structure and design of a novel compact UWB MIMO antenna

In the paper, a concept and design procedure of a novel compact MIMO slot antenna is presented. In order to achieve a better filling of available space, individual antennas are constrained to a triangular shape and optimized for a reduced size. The MIMO structure is then assembled using the two of previously designed antennas in orthogonal arrangement. Surrogate-assisted numerical optimization involving variable-fidelity electromagnetic (EM) simulation models is employed to maintain low computational cost of the design process. The footprint of the MIMO design obtained this way is only 634 mm
²
and features good isolation in the UWB frequency band.