Application of Deschamps´ Graphical Method to Measurements of the Scattering Coefficients of Multiport Waveguide Junctions

A method for measuring scattering coefficients of a multiport waveguide junction is presented. It is based on the application of Deschamps´ graphical technique to reduced multiport junctions, and analysis of measurements done with either matched or nearly matched loads terminated at all but the input and output ports. Averaging and least-square fitting are introduced to reduce errors from measurements.