A planar band-rejected UWB antenna with nonuniform transmission line filter based on inverse scattering theory

In this paper, a planar ultra-wideband (UWB) antenna with rejected band is presented. The antenna is composed of a wideband radiation element and a band-rejected filter realized by nonuniform transmission line (NTL). The geometry of the NTL filter is designed by solving Zakharov-Shabat inverse scattering problem. Firstly, the antenna and filter are fabricated separately and their characteristics are measured. Then they are combined and evaluated too. It is demonstrated that the measurement agrees with the calculation well and the desired characteristics are obtained.