Orthogonal Expansion at Waveguide Discontinuities with Special Applications

The applicability of orthogonal expansion onto general diffraction problems in finite spaces is widened by the introduction of an "intermediate medium". This medium is employed for calculating the scatter coefficients of a sudden cross-sectional change of a round waveguide, in the form of an offset. Several scatter coefficients are available from curve plots. Further curves show reflection and transmission when an H10-mode arrives at a sudden cross-sectional expansion on all sides of a rectangular waveguide. For a rectangular waveguide with periodical enlargements on one side a diagram shows the propagation constants of different wave modes, the pass bands and stop bands, and the appearance of complex waves.