Comparative studies of near field distributions of solid and hollow dielectric diagonal horn antennas

Abstract

Near field distributions of solid and hollow dielectric diagonal horn antennas have been studied theoretically and experimentally. Solutions of the Helmholz's equation are obtained for TE to x and TE to y modes using separation of variables technique for the horn. Transcendental equations for the transverse components of propagation constants are obtained by applying proper boundary conditions. These transcendental equations are solved for the transverse propagation constants for the fundamental mode for different horns each of axial length=12.8 cm and flare angle=8.5/spl deg/ and throat dimension=4.7 cm at the frequency of 9.418 GHz in X-band. The theoretical aperture field distributions obtained for H/sub 11//sup x/ and H/sub 11//sup y/ modes propagating in these antennas are compared with corresponding experimental ones. Comparative studies are also done for aperture field distribution of solid and hollow dielectric diagonal horn antennas.