A new method of solution for radiation from a flanged waveguide

A method of solution for radiation from a flanged waveguide is described. The problem is formulated using generalized mode matching technique [1], appropriate for geometries that include open regions. The resultant equation is solved using an extended version of the Modified Residue Calculus Technique originally developed for application to closed region problems. This technique has several advantages, among which is its numerical efficiency. Some numerical results are included and compared with those reported by others.