Table of Contents

Chapter 1 Fundamentals: hisotrical background; extremum principle; variational principal; microwave network theory; variational expressions for waveguides and cavities; new theorectical developments; conclusions; references. Chapter 2 Variational principles in electromagnetics: mathematical and physical variational quantities; methods for establishing variational principles; comparison with other concepts and methods; trial field distribution; variational principles for solving peturbation problems. Chapter 3 Analysis of planar transmission lines: topologies used in microwave integrated circuits; quasi-static methods; full-wave dynamic methods; analytical variational formulations; discretized formulation; conclusions; references. Chapter 4 General variational principles: generalized topologyp; derivation in spatial domain; derivation in spectral domain; methodology for the choice of trial fields; choice of trial components at discontinuous conductive interfaces; resulting advantages of the variational behaviour; calculation characterization; conclusions; references. Chapter 5 Applications: transmission lines parameters; junctions; gyrotropic devices; optoelectronic devices; measurement methods for distributed circuits.