Investigation of Radar Cross Section and Electromagnetic Fields Around an Elliptical Antenna Including Magnetized Plasma Cover

In the present work the scattering of EHF radio waves from a plasma elliptical hybrid antenna is investigated by the Finite Element-Boundary Integral (FE-BI) method. This antenna is made of a dielectric elliptical column covered by a plasma layer as a dispersive medium. The plasma cover has elliptical cross section and has been magnetized by an external constant magnetic field along axis of the antenna. Different geometric configurations of the antenna are examined by changing the position of the dielectric column relative to the plasma layer, so that their large diameters vary from 0 to 90 degrees relative to each other. As will be seen, due to anisotropy of geometric configuration and permittivity tensor of the plasma layer, the angle of incidence and geometrical parameters are very effective on the antenna response. Finally, numerical analysis shows how one can control profiles of the electromagnetic fields and scattering cross section of the antenna by varying the external magnetic field intensity and polarization of the incident wave. The presence of various variables in this antenna makes it significantly flexible and tunable, that is especially important in the cloaking processes.