Design of Compact Ultrawideband Antenna : 9783659681080 : 27 Jan 2015 : The Ultra-Wideband (UWB) technology is based on the new concepts of a very short pulse signals. This technology is a good candidate for the next generation (4G) networks, but it requires a new approach to antenna design in order to achieve UWB characteristics. This work analyzes the design of Microstrip line feed rectangular-cut ultrawideband (UWB) antenna and presents UWB antenna simulations in transient mode used to verify antenna parameters improvements. The antenna has been designed on a FR4 substrate with dielectric constant or = 4.4, loss tangent (tan d)=0.02 The antenna has been optimized to exhibit UWB characteristics from frequency range 3.1GHz-12GHz. The radiation pattern of this antenna is nearly omni-directional in H-plane and bidirectional in E-plane. The effect of various design parameters on design have also been analyzed using CAD Feko 6.1 simulator using MoM. The simulated results are in good agree