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A novel compact Ultra wideband antenna fed by CPW is presented. The antenna has a size of 29 mm Ã 32 mm. It provides band width ranging from 2.9 GHz to 11.1 GHz. The antenna can be easily integrated with radio frequency circuit for low cost. Details of antenna are presented with parametric study. The bandwidth is varied by varying the width and height of inner tuning stub and ultra wideband with is obtained. The antenna is Omni directional in operating range and it has good radiation efficiency. The fundamental parameters return loss, VSWR, radiation pattern are obtained, which meet standard specifications. Method of moments based IE3D simulator is used to analyze antenna.