Polarization properties of a double screen of finite thickness with coaxial-sector aperture

The polarization properties of a double screen of finite thickness with coaxial-sector apertures are investigated. The Stokes parameters of the reflected wave are analyzed in dependence on the distance between the screens for the case of normal incidence of a plane linearly polarized electromagnetic wave upon the double screen. It is shown that the reflection coefficient does not depend on the polarization angle of the incident wave under certain geometric parameters of the structure.