Modified 0.6–50 GHz ultra-wideband double-ridged horn antenna design for parameters improvement

Design of the 0.6-50 GHz ultra-wideband (UWB) double-ridged horn antenna (DRHA) is presented in this paper. This work focuses on several upgrades in the model to improve its performance: by adding absorber and perforations in coaxial to waveguide launcher, Luneburg dielectric lens at the aperture of the horn radiation pattern at upper end of the band and voltage standing wave ratio (VSWR) are improved. Radiation pattern and VSWR of new design are compared with antenna before modifications. The improved DRHA has VSWR less than 1.5 at the band from 1 GHz and the main lobe remains along the antenna axis at high frequencies of the band.