EM Wave Scattering by a Window on a Wall

Electromagnetic wave scattering by a window on a building wall has been analyzed here as plane wave scattering by a dielectric slab in a thick conducting screen. High frequency asymptotic ray method is utilized for this analysis. Geometrical Theory of Diffraction has been used to obtain the diffracted fields by the edges of the aperture, then ray-mode conversion technique has been applied to get the modal field inside the slit region in order to consider the modal coupling and the re-radiation field. The validity of our formulation has been first tested by comparing the results with those obtained by the Kobayashi Potential method for the relatively narrow slit aperture cases. Then the various numerical calculation results have been made to show the effects of the wall and window thickness, and window's glasses for practical wireless mobile communication frequencies.