This study presents a compact 4-element MIMO antenna array designed for THz and 6G communications. The antenna features a straightforward design, utilizing modified T-shaped monopole elements fed by microstrip lines, positioned on opposite sides of a compact board with overall dimensions of 105 × 105 µm². The proposed MIMO antenna demonstrates broadband functionality, operating effectively from 3.7 THz to 4.3 THz. The array exhibits strong potential in terms of key performance metrics, including S-parameters, radiation patterns, and gain/efficiency levels, making it a promising candidate for use in future 6G networks. This research work directly supports SDG 9 (Industry, Innovation, and Infrastructure).

6G, monopole antenna, MIMO, THz networks