Backscattering from a thin metallic disk

An effort recently undertaken to compute radar cross sections of thin metallic disks for frequencies near resonance is described. All calculations are based upon an ideal disk scattering problem in which each disk is assumed to be perfectly conducting and infinitely thin and the incident field is assumed to be an electromagnetic plane wave. A good agreement between the values of the backscattered fields for the ideal disk scattering problem and the thin metallic disk scattering problem for large values of
ka
is found, but may become poor for
ka
less than or equal to 1.0.