Characteristic Planes and Scattering Matrices of E and H-Plane Waveguide Tee Junctions

A unique set of reference planes which enters into the descriptions of either a E-plane or an H-plane tee junctions are the locations of its two characteristics planes. One typical plane coincides with the position of a short circuit at one typical port which will decouple another port from an input port. The purpose of this paper is to numerically and experimentally establish these planes in WR75 waveguide for each arrangement. The paper includes a calculation of the scattering parameters in WR75 waveguide about 13.25 GHz between the characteristic planes of both types of junctions. The characteristic planes of any tee junction enter into the descriptions of quarter-wave coupled circulators and in the construction of the Dicke eigenvalue problem.