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 wearable 6G microstrip patch antennas with diamond (substrate plane) and gold material (ground plane), these antennas are very small and light weight 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 design consists of microstrip patch, substrate, feedline, and ground plane. The simulation parameters such as Return loss, Bandwidth, Gain, VSWR, Directivity, Efficiency and Far Field radiation is calculated. The simulation results show that, the antenna made with diamond material resonates at frequency of 2.09 THz, 3.94 THz, 7.47 THz and 8.8 THz performances better, when compared to antenna made with gold material resonating at frequency of 2.50 THz, 4.69 THz and 6.86 THz.