Electromagnetic Field Intensity Distribution Along the Focal Region of a Metallic Parabolic Reflector Covered With a Plasma Layer Under Oblique Incidence

Theoretical analysis of the electromagnetic (EM) field distribution in the focal region of a long metallic parabolic reflector that has its surface covered with a uniform cold plasma layer has been carried out. The incident wave is considered to be with a general oblique incidence. The EM field intensity expressions in the focal region have been obtained accurately using Maslov´s method. The effects of plasma thickness on the reflected and transmitted field distributions are investigated. The effects of other physical parameters such as the plasma and the wave frequencies and the angle of incidence on the transmitted field-intensity distribution along the focal region are also studied. This problem is also solved using Kirchhoff´s approximation and the results of the two methods are found to be in good agreement.