Ultra-wideband horn antennas with a considerable difference in radiation pattern width in E- and H-planes

Abstract

The paper presents results of theoretical and experimental investigation of ultra-wideband horn antennas with a rectangular aperture and input formed by a symmetric H-waveguide. The antennas show a considerable difference in their radiation pattern widths in the E-and H-planes, and good matching properties in a range of frequencies from 1 to 10 GHz. The required difference between radiation patterns of the antennas is attained by proper selection of horns’ geometry and application of a diverging dielectric lens in each horn. Optimal profiles of the horn antenna generatrix and of the dielectric lens placed inside are determined. Reliability of results of the theoretical analysis is confirmed by testing the designed prototypes of the ultra-wideband H-sectorial and E-sectorial horns.