With the increasing development of wireless technologies and the increasing demand for wide bandwidth in communication and military systems, the design of compact, efficient, and versatile antennas for ultra-wideband (UWB) applications has gained significant importance. In this paper, an innovative antenna for the frequency band of 1.3 to 10.6 GHz is designed and fabricated. This antenna is designed using a defective ground structure (DGS) and coplanar waveguide (CPW) transmission lines on a small FR4 substrate with dimensions of 26.6 × 29.3 × 1.6 mm. The proposed antenna is unidirectional with high gain, has a peak gain of 4 dBi, and the simulation results show that its VSWR value is lower than the standard value at most points of the bandwidth, which indicates the impedance matching of the antenna. The results of the antenna fabrication and simulation indicate its optimal performance in fields such as high-speed wireless communications, surveillance radars, and reconnaissance systems. Among the prominent applications of this antenna is its use in ultra-wideband jamming systems in the field of electronic warfare. The compact design, high gain, and wide bandwidth make the proposed antenna an ideal solution for advanced military and communication technologies that can effectively meet the modern needs of these fields.