In this manuscript, gain improvement is observed for an ultra-wideband (UWB) antenna. The proposed arrangement is optimally designed for high gain wideband communications. This arrangement comprises a low profile and easily circuit integrated antenna covering spectrum ranges from 3.1 GHz to 10.6 GHz for low power UWB communications. Extended impedance improvement is also achieved by employing a co-planar waveguide (CPW) feeding mechanism incorporating a castle shaped profile and wider radiation element. Moreover, a periodic structure based single layered frequency selective surface (FSS) for gain improvement is also suggested. This split center resonator (SCR) FSS is designed and employed owing to a smaller footprint and stable performance. The performance of this antenna-FSS arrangement is analyzed by varying the inter-element spacing of SCR, distance between SCR layer and the proposed CPW fed antenna. The simulations and measurements validate at least 5 dBi of gain improvement while offering wideband impedance matching and stable radiation performance. This improved performance and low-profile design makes the proposed arrangement suitable for modern high gain UWB communication services.
