Radiation pattern of modified box-horn antenna

Abstract

The expression for radiation field of modified box-horn antenna is derived using plane wave spectra for three-dimensional fields. Modified box-horn is a modified version of conventional box-horn, in which the horn exciting the box is flared in both E- and H-planes to increase its aperture size. It supports TE10- and TE30-modes at its aperture. The radiation patterns of modified box-horn antenna in E- and H-planes are computed at 10 GHz and corresponding radiation parameters are extracted from the plots and compared for different flare angles in E-plane of pyramidal horn exciting the box. The results for half power beam-widths in E-plane demonstrate that the radiation pattern of modified box-horn in E-plane can be made narrower by increasing the flare angle in E-plane of pyramidal horn exciting the box. The radiation patterns of modified box-horn are also compared with those for TE 10-mode open ended waveguide of same aperture size and it is found that the former is narrower beam in H-plane than the latter. The analysis has been validated against the experimental results available in the literature. The antenna presented here may find potential application as an element in a phased array for microwave wireless communication/radar beam steering, a feed for reflectors in point-to-point microwave communication/satellite communication. © 2008 Wiley Periodicals, Inc.