 The proposed triple-band notched ultra-wideband, UWB, monopole antenna uses a planar electromagnetic band gap, EBG, designed to achieve triple-band rejection. The EBG unit cells near the feedline provide notches at 4.2 GHz, 5.2 GHz, and 9.1 GHz, which can be used in C-band satellite downlink, wireless local area network, WLAN, and X-band radio location applications. The parametric analysis shows that the EBG unit cells near the feedline have a significant impact on the performance of the antenna. The input impedance and surface current distribution analysis demonstrate how the EBG unit cells affect the antenna's performance. The proposed design has been fabricated and tested, and the results show good agreement with the simulation results. This article was authored by Vamshika Lipara, Samanini Petakrishna, and Jayendra Kumar.