Design of antenna reflector using two layer frequency selective surfaces for directivity enhancement in UWB application

This paper presents the design of UWB reflector for antenna application by using two layers of a band stop frequency selective surface (FSS). The structures of both FSS are based on the modified square ring resonator. By combination of two FSS structures, they achieve the wide frequency range of 2.9–11.2 GHz. The demonstration of the FSS reflector with UWB slot antenna shows that the radiation efficiency of antenna is improved over the entire UWB spectrum.