MODIFICATION TO THE SCATTERING BEHAVIOR OF A SPHERE BY REACTIVE LOADING.
Scientific rept. no. 2,
MICHIGAN UNIV ANN ARBOR RADIATION LAB
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Electromagnetic scattering behavior by a metallic sphere loaded with a circumferential slot in the plane normal to the direction of incidence is investigated. The slot is assumed to be of small but non-zero width with electric field constant across it, and under this assumption the analysis of external field is exact. The field scattered in any direction is obtained by superposition of the field diffracted by an unloaded sphere and that radiated by an excited slot at the position of the load, with the radiation strength of the slot related to the loading characteristics in the combined problem. Thus, there are two parameters that determine the scattering behavior of this object the loading admittance and the position of the slot. Numerical results are presented primarily for the case of back scattering and these are compared with experimental measurements made using a metallic sphere with an equatorial slot backed by a radial cavity of adjustable depth. Author