Wide-band optimization of E- and H-plane waveguide junctions

The authors present a user-oriented design tool for E- and H-plane lossless waveguide junctions. The circuits considered are bounded by two parallel conducting planes and by one or more cylindrical sidewalls of arbitrary shape. The P-ports are placed on rectangular waveguide sections, which, in the frequency band of interest, permit the propagation of interest, permit the propagation of the dominant TE₁₀ mode only. They assume that the medium is homogeneous, isotropic and lossless. The algorithm has two distinguishing features: the inclusion of a very efficient code to perform the analyses needed to evaluate the error function; and the use of a perturbational technique to obtain its sensitivity to geometrical deformations. Both features, which are discussed, contribute to keep CPU times within reasonable limits, making feasible the design of complicated junctions