Katsenelenbaum B. Theory of Nonuniform Waveguides. The Cross-Section Method 1998

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This book is devoted to one of the mathematical methods employed to solve a certain class of electrodynamic problems, considering nonuniform oversized
(or overmoded) tubular metallic waveguides. Their properties are monotonically varying along the direction of wave propagation. At present, the most
important scientific and technological applications of overmoded transmission lines are in the area of magnetically confined nuclear fusion experiments