Shape dependence of the scattered electromagnetic field of spheroidal perfect scatterers

In the present paper an approach to investigate the shape dependence of a perfect axissymetric scatterer and especially a spheroid, with relation to its scattered electromagnetic field is attempted. For this investigation a spheroid has been selected with varying ratio of its dimensions. The investigation is based on the principle of maintaining the scatterers area constant while changing its shape from oblate to spherical and then to prolate. For this purpose, the method of moments with the use of numerical electromagnetics code (NEC) and a hybrid method are applied and the results of the bistatic and monostatic radar cross section computations are analyzed and presented. For these spheroids, it is shown that when the incident plane wave travels towards the -z axis, there are some elevation angle regions that the radar cross section of the bodies keeps to remain in very low levels even when the ratio of the spheroids´ dimensions change