Date of Award

Spring 1982

Document Type

Dissertation - Restricted

Degree Name

Doctor of Philosophy (PhD)


Electrical and Computer Engineering

First Advisor

Ishii, Thomas K.

Second Advisor

Sedivy, Jan K.

Third Advisor

Tani, Simo


Several methods to obtain the solutions of the waveguide junction problems, which are the important and indispensable topics in the area of microwave engineering, have been published in the past decades. Of those methods, the Quasi-Static method used by Smythe, the Variational method by Collin, the combination of the above two methods by Marcuvitz, the Singular Integral Equation method by Lewin, the Modified Residue Calculus technique by Mittra and et. al'., and several others such as the moment method, the ray method, and the Complex Power technique are well known and used in the present time. However, in general, all those methods have some degree of mathematical complexity and physical ambiguity. The purpose of this dissertation is to develop a method based directly on the physical principles rather than the complicated mathematical hypothesis, in order that the difficulties of the above mentioned methods may be removed. In Chapter I, the controversy about the momentum expression of the electromagnetic field will be introduced. The possible solution of this controversy and the derivation of the new expressions of the energy and momentum densities of the electromagnetic waves will be discussed in Chapter II and III. A new computational method, called a "Local Field Method", based on the theory developed in Chapter III and its applications for the practical waveguide junction problems are presented in Chapter IV. The numerical results obtained in Chapter IV will be supported by the known experimental techniques. These are presented in Chapter V. In Chapter V, a new technique for measuring the evanescent field penetration in the waveguide will also be presented.



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