In this paper, we propose a novel design for a compact and efficient THz antenna, envisioned for prospective 6 G communication. The miniaturized THz antenna architecture incorporates a new-shaped patch with rectangular slots, an invertedL slots, and a slotted partial ground plane. The antenna is designed on a Rogers RT5880 material with a thickness of 10μ m and dimensions of 300×300μ m2. The design achieves a wide bandwidth of 620GHz(2.83−3.45THz) coupled with a low reflection coefficient and high radiation efficiency, peaking at 87%. Additionally, the antenna demonstrates commendable performance in terms of VSWR, directivity, gain, and radiation patterns. The analysis of radiation material variation (gold, graphene, and copper) reveals that copper offers the best results in terms of performance and cost effectiveness. The THz antenna is well-suited for a variety of 6 G applications, including high-speed wireless communication, as well as imaging, sensing, security, and material characterization within the THz frequency spectrum.