ABSTRACT
In circuit theory, we make use of ideal voltage and current sources to simplify analysis and conceptual understanding of the subject. We find the concept of an ideal generator a very useful one in the analysis of networks. Currents or voltages which disappear when the impressed sources are turned off are referred to as induced currents or voltages. The concept of equivalent source representation turns out to have important application in the treatment of coupled lines as well as for the excitation itself. In this section, the authors give an overview of the behavior of coupled transmission lines, leaving specific configurations to a later chapter. They recognize that the coupling term can be interpreted as a distributed external voltage source exciting conductor, although it is a source dependent on the current in wire.
