THE MINIMIZATION OF THE RADAR CROSS SECTION OF A CYLINDER BY CENTRAL LOADING.
Scientific rept. no. 1,
MICHIGAN UNIV ANN ARBOR RADIATION LAB
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The induced current on a center-loaded cylinder illuminated by a plane wave at an arbitrary angle was obtained. It was found that when a cylinder is illuminated by an obliquely incident plane wave the induced current has a symmetrical and an antisymmetrical component. The symmetrical component can be modified greatly by central loading but the antisymmetrical component is not affected. In a resonant cylinder the symmetrical component of the induced current dominates the antisymmetrical component. In an antiresonant cylinder the antisymmetrical component is dominant. Therefore, the scattering cross section of a resonant cylinder can be greatly reduced by central loading while the cross section of an antiresonant cylinder can be modified only slightly. The back scattered field of a center-loaded cylinder illuminated by a plane wave at an arbitrary angle was obtained. The scattering cross section of a resonant cylinder can be reduced more than 30 db by an optimum loading. The scattering cross section of an antiresonant cylinder can be reduced only in the broadside direction but the large cross section in the offbroadside direction can not be reduced by central loading. Author