Abstract
In this chapter an attempt has been made to summarise various network theoretical concepts which are relevant to modern filter design. The book is concerned entirely with linear passive time-invariant networks and so these properties have been precisely defined. The concept of the input impedance of a network in terms of the complex frequency variable has led to the properties of positive real and bounded real functions. The synthesis of lossless one-port networks has led on to Darlington synthesis of terminated two-port networks, with lowpass ladder networks being one particular case. Various analysis techniques in terms of ABCD matrices, S parameters, even and odd-mode networks and image parameters have been discussed.
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