Abstract
Theoretical formulation of the electromagnetic field distribution in the focal region of an elliptical reflector that has its surface coated with an unmagnetized collisional plasma is derived in this paper. The incident wave is considered to be with a general oblique incidence. Expressions for the electromagnetic field intensity along the focal region have been obtained accurately using Maslov's method. Maslov's method is systematic procedure, which combines the simplicity of ray optics and the generality of transform methods. The derived analytical field expressions in the focal region have been solved numerically. The effects of the plasma layer thickness on the reflected and transmitted field intensity distributions were inspected. Other physical parameters such as the plasma electron density, the angle of incidence and the effective collisional frequency have been observed to have an evident influence on the levels of the transmitted field intensities along the focal region. The problem discussed in this paper has been, also, solved using Kirchhoff's approximation and the results of the two methods are in a good agreement.