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Exterior-Interior Aperture Coupling of a Rectangular Cavity with Wire Obstacle

机译：矩形腔与线障碍的外 - 内孔耦合

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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 e(to the i omega tau power) 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 Green's dyads' eigenfunction expansions. Numerically tractable integral equations for the aperture electric fields and the wire currents are obtained. A summation method is developed for evaluation of otherwise slowly converging eigenfunction expansions of potentials dyads when source and observation points become close. The numerical reduction of the integral equations by the method of moments is described. The numerical results for the aperture fields and the wire currents disclose a minus sign discrepancy between the results and previous results of Seidel. A discussion is given which supports the sign in the present work. (Author)

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