This paper produces A simple compact band-notched dielectric resonator antenna used for ultra-wideband (UWB) applications. A rectangular dielectric resonator with rectangular air gab in the middle is used to achieve the optimum bandwidth and optimum gain for the proposed design. To eliminate any possible interference and overlapping, a new technique is presented to make a notch-band for the frequencies that are already used in the UWB such as the WLAN band (5.2-5.6GHz) by etching slots in the feedline. By varying the length of the slots, we can obtain many notch bands at various frequencies. The proposed antenna has a −10 dB impedance bandwidth of 87% from 3.2 GHz to 10.6 GHz. The proposed antenna is simulated by two simulation programs which are basically different to confirm the results; CST Studio suiteTM 2020 simulator based on the Finite-Difference Time-Domain (FDTD) method and HFSS 15 from Ansoft based on the Finite-Element Method (FEM).