Three boundary value problems involving discontinuities in a parallel plate waveguide are solved. The three kinds of waveguide discontinuities studted are: 1) the metallic step discontinuity, 2) the inhomogeneous E-plane bifurcation, and 3) the trifurcatior. The generalized scattering matrix technique, introduced by Mittra and Pace, is applied to solve these problems. The solutions obtained are formally exact and in jeries form. No restriction is made on the operating frequexcy of the

more »

... The solutions are equally valid for oversized waveguides, in which several modes are allowed to propagate down the guide at once. The results of numerical computations of the reflection coefficient for the dominant mode in the waveguide are reported. T:ie computations were performed on a digital computer. Where possible, the author's results are compared with those published by Marcuvitz, Williams, and Cronson.