The theory of radiation from an open-ended circular crosssection waveguide is extended by including the excitation of all possible higher-order waveguide modes at the waveguide-to- free-space boundary. The theoretical expressions are formulated using spectral-domain techniques. T
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The theory of radiation from an open-ended circular crosssection waveguide is extended by including the excitation of all possible higher-order waveguide modes at the waveguide-to- free-space boundary. The theoretical expressions are formulated using spectral-domain techniques. The validation is performed using the existing commercial tool FEKO with the Method of Moments (MoM) solver for a cylindrical waveguide with the fundamental mode excitation (TE11) and the corresponding higher-order mode, which has the same azimuthal variation as of the fundamental mode, which is (TE12). @en
