High Frequency Plane Wave Scattering Analysis by Large Buildings with Multiple Windows

In this study, the scattering fields by multi-window buildings have been analyzed by using the Kirchhoff approximation method. The scattering fields are obtained by the radiation integrals due to the equivalent current sources excited by the incident plane wave on the exterior of the building and the virtually closed window apertures. The fields in the window region are represented by rectangular waveguide modes, then the reflected fields from window glasses are also converted to the equivalent currents. The validity of our formulation has been confirmed by numerical comparison with the physical optics method and by measurements on scale models. Discussions have been made on the impact of window glass in the context of high-frequency wireless communications.