Exterior-Interior Aperture Coupling of a Rectangular Cavity with Wire Obstacle.
Annual technical rept. 1 Oct 77-30 Sep 78 on Phase 2,
ARIZONA UNIV TUCSON ENGINEERING EXPERIMENT STATION
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In this work, the exterior-interior coupling problem of a cavity backed aperture in a perfectly conducting infinite sheet is considered. The cavity is assumed to be rectangular and contains a perfectly conducting obstacle. For numerical considerations the obstacle is taken to be a straight, thin wire, oriented perpendicular to one of the cavity walls. The problem is formulated in the frequency domain with an expiomegat time dependence. The dyadic formulation of this vector electromagnetic boundary value problem is given. The controversy over the longitudinal wave functions and their contribution to field dyads is resolved. Specific attention is given to the singularities and completeness of the Greens dyads eigenfunction expansions. Numerically tractable integral equations for the aperture electric fields are obtained. A summation method is developed for evaluation of otherwise slowly converging eigenfunction expansions of potential dyads when source and observation points become close. Suggestions for future extensions of this work are discussed. Author
- Electricity and Magnetism