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Slotted parallel-plate waveguide coupled to a conducting cylinder

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3 Author(s)
Mannikko, P.D. ; Dept. of Electr. & Comput. Eng., Coll. of Eng., Clemson Univ., SC, USA ; Courtney, C.C. ; Butler, C.M.

The problem of electromagnetic scattering from a perfectly electrically conducting cylinder in the presence of a slot in a parallel-plate waveguide is considered. A two-dimensional slot in one of the walls of the parallel-plate guide opens into a half-space in which the two-dimensional conducting cylinder resides. The excitation for this structure is an incident TEM wave from within the waveguide, and/or a magnetic line source which produces an incident TE/sub y/ wave in the exterior half-space. Coupled integral equations for the aperture electric field and the cylinder current are derived from first principles and are solved numerically for cylinders of various cross-section, size, and location relative to that of the slot aperture. From knowledge of the aperture electric field and cylinder current, all other quantities of interest may be determined. For TEM excitation from within the guide, the reflection coefficient and radiation pattern data are presented along with the aperture electric field and cylinder current. For external excitation, data are presented that illustrate how the cylinder serves as a shield for the aperture. From this data one can assess the effectiveness of a conducting shield placed over, but not in contact with, the guide aperture.<>

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings H  (Volume:139 ,  Issue: 2 )