This paper presents a novel two-element partially dielectric loaded planar Vivaldi antenna array for ultra-wideband applications. This array is capable of operating between 380 MHz and 3 GHz and is designed on a 1.6-mm thick low-cost FR4 substrate with total size of 25 × 330 × 430 mm3. Innovative approaches to various gain enhancement techniques such as partial dielectric loading, corrugations, and U-shaped back reflector used for planar Vivaldi antennas, are collectively employed in this design. Various elements of the array are interconnected. The two-element Vivaldi array is fed by using a power divider. The array is designed by using a full-wave three-dimensional EM simulation tool. The designed antenna is manufactured and then measured. The simulation and measurement results are found to be consistent with each other.