The design of a wearable antenna for UHF band at 900 MHz with an integrated front-end for a wireless sensor system targeting remote patient monitoring is presented. A wearable antenna for human body with-7.2 dB gain is demonstrated using five layer torso model. The antenna can deliver 25 µW of power to the rectifier at 4.6 meters distance from the base station emitting PEIRP =4 W. Local power management circuitry consumes a total power of 4 µW while delivering 10 µW of power for the sensors of the wireless sensor system. The system designed with 0.18µm CMOS process demonstrates the performance of the frontend together with 3D electromagnetic simulation results of the wearable antenna.