Abstract
Waveguide structures are composite regions containing not only uniform or nonuniform waveguide regions but also discontinuity regions. The latter are regions wherein there exist discontinuities in cross-sectional shape; these discontinuities may occur within or at the junction of waveguide regions. The equivalent circuits representative of the discontinuities together with the transmission lines representative of the associated waveguides comprise a microwave network that serves to describe the fields almost everywhere within a general waveguide structure. The present chapter is principally concerned with the general nature and properties of the parameters that characterize such microwave networks.

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