A structurally flexible microstrip antenna intended for Wireless Body Area Network (WBAN) applications is discussed in this paper. The structure of the antenna has evolved from the basic microstrip patch design. To have an improvement in gain and radiation efficiency, the rectangular edges of the patch are modified to curved edges. To further tune the antenna for the design target of 5.8 GHz, the design is embedded with circular and rectangular slots along with partial ground plane. Inset-fed radiating structure to have a better reflection coefficient and wide bandwidth. It is manufactured on a silicon-based polymer substrate. With these structural changes, the design exhibits a low reflection coefficient of −45.2 dB, with an extended −10 dB bandwidth ranging from 5.6 GHz to 5.9 GHz. A carefully dimensioned partial ground plane is used to mitigate surface wave propagation and improve radiation performance. Simulation results demonstrate a peak gain of 6.12 dBi and stable field distribution across the patch surface, confirming the antenna’s efficiency and robustness even under bending. The proposed model enhances impedance match, gain, and radiation efficiency compared to earlier flexible designs, rendering it suitable for wearable IoT modules, continuous physiological monitoring, and biomedical telemetry systems. The design attains excellent electromagnetic performance while maintaining physical compatibility for integration with human-worn systems.