Dual-Polarized 2×2 MIMO Antenna Based on Half Mode Substrate Integrated Waveguide

A novel compact 2×2 dual-polarized MIMO antenna based on half mode substrate integrated waveguide (HMSIW) is proposed. The four HMSIW antenna elements are printed orthogonally on the top of the substrate to achieve the dual polarization operation, which results in a low mutual coupling. The side by side distance between the antenna elements is only 0.032λo. The simulated impedance bandwidth is 2.4% from 4.77 to 4.89 GHz and the peak gain is 5.4 dBi at the center frequency of 4.83 GHz. The mutual coupling level between the antenna elements is around -20 dB. The size of the MIMO antenna is 1.045λo×1.045λo×0.025λo, which is a suitable candidate for 5G portable devices.