A novel folded dipole with double U slots RFID Tag antenna for wearable RFID sensing applications is designed and studied. The compact tag structure consists of folded dipole and two U slots shapes for miniaturization of antenna radiating part as well as to enhance its radiation performance in UHF band. A Genetic Algorithm optimization technique has been utilized with HFSS software for optimization of the proposed tag dimensions, in order to achieve better return loss and good realized-gain. The proposed epidermal tag was placed at very close proximity of human skin, which represents the big challenge due to the high losses of human tissues that could strongly degrade the radiation efficiency of the tag. By means of detailed simulations and numerical study our novel RFID tag placed on human torso presents good gain and well matching impedance across the operational bandwidth
