Abstarct: Since the release by the Federal Communications Commission (FCC) of a bandwidth of 7.5GHz (from 3.1GHz to 10.6GHz) for ultra wideband (UWB) wireless communications, UWB is rapidly advancing as a high data rate wireless communication technology. As is the case in conventional wireless communication systems, an antenna also plays a very crucial role in UWB systems. However, there are more challenges in designing a UWB antenna than a narrow band one. A suitable UWB antenna should be capable of operating over an ultra wide bandwidth as allocated by the FCC. At the same time, satisfactory radiation properties over the entire frequency range are also necessary. Ultra Wide band antenna baxsed on fractal geometry has been proposed in this thesis.The proposed antenna is microstrip line fed and its structure is baxsed on fractal geometry where the resonance frequency of antenna is lowered by applying iteration techniques. Analysis of fractal antenna is done by using Software named HFSS 13. This antenna has low profile, is lightweight and easy to be fabricated and has successfully demonstrated multiband and broadband characteristics. The antenna size inclusive of the ground plane is compact with dimensions 21mm ×23.5 mm and has wide operating bandwidths of 37 GHz. The antenna exhibits omnidirectional direction radiation coverage with a gain from 3 to 6 dB in the entire operating band. Measured results show that this antenna operates from 2.6 to 40 GHz with a fractional bandwidth of above 175% and has relatively stable radiation patterns over its whole operation band.