The scattering phenomenon of plane waves from an unstable elliptical plasma antenna is investigated. The role of surface plasmon excitation in the scattering pattern is studied. In the antenna mentioned above, there is a metallic rod with dielectric cover embedded in a long plasma column with an elliptical cross section. The antenna is considered unstable because of the injection of an electron beam into the plasma layer. The effects of applied accelerating voltage and applied current intensity on the scattering pattern and resonance frequency are investigated. The geometrical structure and its effect on the scattering cross section and creation of new resonance frequency are studied.
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