Scattering of TE11 Mode from Two Asymmetric Ridges of Finite Thickness in a Circular Waveguide

The scattering properties of the TE11 mode from two asymmetric ridges of finite thickness in a circular waveguide are determined using the Coupled-Integral-Equations Technique (CIET). Two vector coupled integral equations for the transverse electric field at the two discontinuities are derived and then solved by the moment method. The eigenmodes of the ridged section, in terms of which the kernels of the integral equations are expressed, are themselves determined using the CIET where basis functions with the proper edge conditions are used.