Therapeutic treatment has been revolutionized with the advent of implantable drug delivery devices. These devices hold immense potential to treat chronic ailments, such as cancer tumours that require high drug concentrations. A wireless system is an integral part of the device to regulate drug release according to prescribed dosing schedule. An antenna is important component of a wireless system for data telemetry and actuating the drug release mechanism. In this paper, we propose an ultrawideband conformal loop antenna around the capsule shaped device. The flexible layer of microchambers is also conformed around inner shell of the capsule. The CST Gustav voxel human body model was used to perform numerical study of the antenna. According to the simulation results, the proposed capsule antenna has shown reflection coefficient of -11.83 dB at the desired frequency of 900 MHz.