Design and performance analysis of an aperture coupled MIMO antenna for THz applications

A square patch-shaped, aperture-coupled microstrip feed wideband 2-radiators MIMO structure is examined for high-speed communication at terahertz (THz) frequencies. It covers - 10 dB bandwidth of 0.3 THz (0.17 THz - 0.47 THz). Here, advantages of aperture coupling technique for wider impedance bandwidth and better radiation characteristics is incorporated at THz frequency. Without adding any decoupling structure high port isolation of above -20 dB is obtained between the two closely spaced radiators of MIMO system. Broadside radiation pattern with peak gain of 12.5 dB is achieved. MIMO antenna with two radiating patches is designed on a compact rectangular substrate of size 3.5×7×0.8 mm3. Polyamide with dielectric constant of 3.5 is used as substrate material. Antenna performance characteristics like mutual coupling between two radiating elements, reflection coefficient, and diversity parameters (diversity gain and envelope correlation coefficient) are in the suitable range. This structure is an appropriate candidate for Broadband 5G network, 3-D printing, vehicular communications, Imaging, Health care, astronomical radiometric, and Terahertz wave radar applications.