An ultra-wideband (UWB) antenna for wireless communication in proximity to a human body and between devices having no line-of-sight, includes symmetrical radiators disposed on a side of a dielectric layer, and a differential microstrip feeding line disposed on the side and an opposite side of the dielectric layer. The UWB antenna further includes a top dielectric layer disposed over the side of the dielectric layer, a bottom dielectric layer disposed over the opposite side of the dielectric layer, and a top connecting plate disposed on an outer surface of the top dielectric layer. The UWB antenna further includes a bottom connecting plate disposed on an outer surface of the bottom dielectric layer, and an inter-layer connector configured to connect ends of each of the symmetrical radiators to the top connecting plate and the bottom connecting plate, respectively.