In this article, a microstrip patch antenna array has been designed for sub-terahertz application. The designed antenna array consists of four rectangular-shaped radiating patches which are fed using the microstrip line feeding technique. The dielectric material utilized as a substrate is Roger RO3010 which has an epsilon value of 11.2, responsible for compact antenna size, it also exhibits minimal energy absorption and dissipation. The designed antenna has achieved acceptable simulated results of important parameters which include radiation pattern, Gain, and return loss, Bandwidth, current distribution, and impedance matching of the antenna. The designed antenna array offers increased bandwidth, enabling higher data rates and ultra-low latency. The proposed Sub-terahertz antenna array can support the deployment of high-speed, low-latency wireless networks for applications such as virtual reality (VR), augmented reality (AR), autonomous vehicles, and smart cities.