The radiation of Ultra-wide band (UWB) pulse is a new subject in antenna field. This paper describes a new type of the UWB radiating antenna, high repetition-rate and high power impulse generator and half paraboloidal impulse radiating antenna (IRA) including antenna theory, system engineering design and experiment. The output of the compact high power system of half IRA designed and constructed has the peak electric field of 13kV/m at a distance of 30m.