As stated in Federal Communications Commission (FCC), the Ultra-WideBand (UWB) radio systems use the designated 3.1 - 10.6GHz frequency band. Due to this large frequency range, there would be interference with WLAN technologies such as IEEE 802.11 a (5.15 - 5.35GHz, 5.725 - 5.825GHz). An ultra-wideband antenna with controllable band-notched is presented. Two semi-ellipses with different radiuses are subtracted to result in the main patch. By varying inner and outer radiuses, much more enhancement in bandwidth occurred. A U-shaped slot is used to make band-stop performance.