An antenna is an electromagnetic radiator, a sensor and a transducer that converts guided electromagnetic energy in a transmission line to radiate electromagnetic energy. Recently Ultra WideBand (UWB) antenna plays an important role in communication system because of its low cost, low power consumption, low interference, capability of high data rate of around 100mega bits/second and easy fabrication. This paper presents design & simulation of ultra wide band microstrip patch antenna with notched characteristics. The antenna was designed using FR-4 substrate with dielectric constant of 4.4 and thickness of 1.6mm.