Electromagnetic Fields in Nonuniform Lossless Transmission Lines

摘要

Methods are developed for electromagnetic field calculations in nonuniform lossless transmission lines which support quasi-one dimensional propagation of a single baseband wave species. Approximate solutions are obtained in perturbation series for smoothly tapered lines by expanding Maxwell's equations and boundary conditions in the dimensionless parameter eta, given by the ratio of typical cross-section dimension to the length of the tapered section. The method emphasizes construction of a single 'warped' field description rather than the local modal expansions of Schelkunoff's generalized telegraphist's equations. (Author)