Three-port networks consisting of three transmission lines and three branching resistors at a junction are discussed, assuming TEM wave propagation and lossless lines. The matching conditions for the resistive three-port are modeled by scattering matrices. As transmission lines of unequal length are used, the network transfer functions are derived for three different delay variables. These functions are obtained in a matrix form after their expansions with respect to these variables are derived, so that output waveforms can be calculated from the network transfer functions or their expansions. Three characteristics of output waveforms are discussed. Ideal networks that furnish the same output waveforms as their inputs and practical networks that have parameters as close as possible to the ideal are described. Examples of networks that keep the ringing of output waveforms within given tolerances, from the first arriving wave to the steady state, are presented. Power dissipation is discussed.
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