Application of spectral theory methods to problems of wave propagation

Mathematical models of electromagnetic wave propagation in transmission lines are examined for both open and shielded lines. The approach used here is based on the normal wave method. Mathematically, the normal wave method leads to an analysis of nonlinear non-self-conjugated spectral problems for systems of partial differential equations. Spectral problems are analyzed by reducing them to operator equations. Results of theoretical studies of spectral problems are presented, as are results obtained by numerical methods for microstrip, slotted, and other superhigh frequency lines.