Theoretical analysis of cylindrical hybrid modes in a corrugated horn

The propagation behaviour of a corrugated cylinder is considered with particular reference to the application of such structures to hybrid-mode feeds for large reflector antennas. Results are presented which relate to the design of narrow-flare-angle horns of circular cross-section. These include the parametric dependence of a number of special points on the propagation curves. A procedure for achieving a balanced hybrid condition in the horn aperture is discussed following the proposal made by Bryant.