The design and analysis of an Ultra-Wideband (UWB) antenna with a four-element phased array has many applications such as wireless communication and radar systems with high precision. The study addresses the limitations of conventional UWB antennas, such as low gain and omnidirectional radiation patterns, by exploring various slot designs to enhance performance. The proposed \({1}\times {4}\) E-plane antenna array, utilizing slots like triangular fractals, achieves significant improvements in bandwidth and gain, reaching up to 7.83 GHz and 4.5 dBi, respectively, for a single element, and 11.77 dBi for the array. The phased array design enables effective beam steering between \(-15^{\circ}\) to \(+15^{\circ}\) with low side-lobe levels, enhancing overall system performance for high-resolution radars, 3D microwave imaging, and other UWB applications.