Four Port CP-MIMO Antenna of Triangle Slots

A 2 x 2 multiple input multiple outputs (MIMO) circularly polarized CP-MIMO antenna is designed. An artificial magnetic conductor backs the slots to eliminate back radiation. Each slot is coupled to two orthogonal printed microstrip lines from a power divider that equally divides the power with a 90° phase difference for CP radiation. The proposed antenna provides 7.5 dBi peak gain and 12.7% axial ratio (AR) bandwidth with isolation better than -20 dB.