Antipodal Vivaldi Microstrip Antenna for Terahertz MIMO

This paper presents the two-stage design of a terahertz (THz) 4-ports multi-input-multi-output (MIMO) ultra-wideband (UWB) antipodal Vivaldi microstrip antenna. The design was done with a time-domain solver at the Computer Simulation Technology Microwave Studio (CST MWS) simulator. The simulated results of the projected reveal antenna with an impedance bandwidth (BW), maximum gain at a solid angle, minimum envelope correlation coefficient (ECC), and minimum diversity gain (DG) of >1846.7 GHz, 8.66dB, 23.48dB, <0.01, and >9.99dB, respectively. Furthermore, a state-of-the-art error analysis has been done with future fabrication etching accuracy (±10μm), dielectric constant (ϵ_r) deviation, and loss tangent (tan δ) deviation of the microstrip substrate, which are frequencies dependent. This state-of-the-art analysis may show the future predicted measurement results of the proposed fabricated antenna, and a good agreement can be achieved between the simulation results and future measurement results with a fabricated proposed antenna. As a result, this THz MIMO UWB antipodal Vivaldi microstrip antenna can be suitable as a base for UM-MIMO antenna for THz wireless communication networks at the sixth generation (6G) after practical experimental verification.