The application of network methods to distributed microwave circuit analysis

The application of network methods to electromagnetic field problems is discussed. The field problem is systematically treated by the segmentation technique and by specifying canonical Foster representations for the subcircuits. Connection between different subdomains is obtained by selecting the appropriate independent field quantities via Tellegen´s theorem. For each subdomain, as well as for the entire circuit, an equivalent circuit extraction procedure is feasible, either in closed form for subdomains amenable to analytical description or via the relevant pole structure description when a numerical solution is available. Several numerical examples are provided, based on modal techniques as well as on transmission line matrix (TLM) modeling