This paper presents the design and analysis of a compact rail fence-shaped patch antenna operating at 33 GHz, specifically tailored for 5G millimeter wave (mmWave) communications. The antenna employs a Roger RT5880 substrate with an overall dimension of 8×6×0.465mm3. Simulation results using CST Studio Suite demonstrate a resonant frequency of 33 GHz with an impressive return loss of -35.89 dB, corresponding to a voltage standing wave ratio (VSWR) of 1.03. The antenna achieves a gain of 7.3 dB and an efficiency of 79.95% (∼ 80%), ensuring efficient power transmission. Furthermore, the antenna exhibits a bandwidth of 1.90 GHz, accommodating the wider bandwidth requirements of 5G mmWave systems. The rail fence patch antenna’s small size, excellent efficiency, and adequate bandwidth make it an attractive contender for fifth-generation technology.