This paper presents an eight-element multiband planar antenna array designed for operation in the 3–25 GHz frequency band, as permitted by The European Commission, 2014. The antenna features elliptical-shaped radiators and a stripline excitation network, ensuring uniform power distribution. The novel array technique effectively addresses the impedance matching challenges in ultra wideband antenna designs. By optimizing the feeding network and incorporating DGS, the design enhances the coupling between the feed and the radiating element, leading to improved gain and a broader bandwidth while maintaining compactness and favorable radiation patterns. The simulation results are in good agreement, indicating that the proposed design is robust and promising for multiband applications.