| The general area of penetration of radio frequency and microwave signals into electronic systems has been the subject of research for a number of years and, in view of recent additional interest, this will continue on into the future. Our goal is to understand how signals created by some external source or by an unrelated apparatus can influence the operation of modern digital electronics deeply embedded within some system, e.g., aircraft, missiles, power stations, communications systems, autos and trucks, computers, and so on. Coaxial and circular-cylindrical waveguides and their characteristics are of particular interest because of the efficient techniques that exist for computing the fields in these cavities. Also, circular cavities repeatedly appear as a part of a larger structure or system where the propagation of electromagnetic energy is of extreme importance. The focus of this study is to take advantage of the extensive knowledge of these types of cavities in attempts to study the propagation through simple structures that may appear as a part of an overall system or that exhibit characteristics which resemble structures of interest.; The foundation of the bulk of the work in this dissertation is an efficient coupled integral equation method for analyzing the fields in a structure composed of cascaded circularly symmetric cavities. This method for analyzing cascaded circular cavities is extended to include more complex cavity structures and coupling to thin wires inside circular cavities. In some cases, the goal is to develop an approximate but efficient method for analyzing these structures so that they may considered as only a small part of larger more complex electromagnetic system. |
