Analysis of Radiation from Waveguide Arrays on Metallic Cylinders, Including Mutual Coupling Effects

Arrays of open ended rectangular waveguides in metallic cylindrical surfaces are considered. An analysis which uses mode matching at the cylinder surface to derive inter-element coupling coefficients is described, and some results are presented. The analysis is then extended to obtain expressions for the radiated far field in terms of the aperture distribution in the elements. Element patterns are presented, and compared with a measured result from an experimental cylindrical array; good agreement is seen. The computed far field pattern for a more practical array is presented, and various features of the pattern are discussed.