This study designed, simulated, and analyzed a patch antenna operating at 28 GHz. This antenna is fabricated using Rogers RT5880 as the substrate material, which has a dielectric permittivity of 2.2, a loss tangent of 0.0009, and a substrate height of 0.5 mm. In addition, the patch has a thickness of 0.035 mm and is supplied through a 50 Ω transmission line. The patch antenna is fabricated using CST software, and the antenna's performance is assessed using various elements, including return loss, VSWR, gain, surface current, and radiation pattern. The designed simulation results indicate a return loss of –64.73 dB, a VSWR of 1.0012, a gain of 7.292 dBi, a directivity of 7.953 dBi, and a bandwidth of 1.162 GHz. Additionally, the design's efficiency is 91.69%. Hence, the proposed antenna will possess a bandwidth above 1 GHz and efficiency beyond 90%. The simulated findings exhibited a good level of consistency with the actual data.