Optimized Spline-Profile Smooth-Walled Tri-Band 20/30/44-GHz Horns

A smooth-walled spline-profile approach has been used to design two examples of easily constructed tri-band 20/30/44 GHz horns. Surprisingly good results were obtained with such a simple configuration. The radiation patterns of the horns have low sidelobes and acceptable cross-polarization levels within each band for application to a very small aperture terminal (VSAT) mobile antenna link.