Wireless Body Area Network (WBAN) is an innovative network system, which consists of numerous wearable or implantable devices that monitors and transmits the physiological data. Designing a wearable patch antenna for WBAN is a challenging, because human body is a lossy medium which can absorb and scatter electromagnetic waves, thus leads to degrade of antenna performance. In this paper, we have designed a multi-slot rectangular shaped 6G wearable microstrip patch antennas, which are unique, small size, and light with a flat surface, unlike traditional counterparts and these can be placed directly on a human body and are comfortable to wear for long periods. The antenna is designed, simulated, and analyzed using Computer Simulated Technology (CST) studio suite and the proposed antenna consists of microstrip patch, substrate, feedline, and ground plane. The simulation parameters such as S-Parameter, VSWR, Bandwidth, Resonating Frequency, Gain, Efficiency, Directivity and Far Field radiation is calculated. The results of proposed wearable 6G patch antenna with varying operating frequencies from 1 THz to 10 THz is presented, Performance parameter shows three slot antenna works better at 5.03 THz for WBAN.