Abstract
An arbitrary junction of three accessible waveguides, each propagating only a single mode, is designated as a six-terminal or three-terminal-pair waveguide structure. The over-all description of the propagating modes in such a structure is accomplished by representation of the waveguide regions as transmission lines and by representation of the junction region as a six-terminal lumped-constant equivalent circuit. The three transmission lines together with the lumped-constant circuit comprise a six terminal network with the aid of which reflection, transmission, standing wave, etc., properties of the over-all structure can be determined by conventional network calculations. The quantitative description of the transmission lines is effected by indication of their characteristic impedances and propagation wavelengths. The description of the six-terminal lumped-constant circuit requires, in general, the specification of six circuit parameters and the locations of the three corresponding terminal planes. If the structure possesses geometrical symmetries, a reduction in the number of required circuit parameters is possible.
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