Propagation modeling based on measurements and simulations of surface scattering in specular direction

Accurate channel modeling for future THz communication systems requires knowledge of the reflection properties of typical building materials. Using Fresnel's equations it is possible to obtain this data from simple measurements of the dielectric properties in case of smooth material surfaces. We extend this method to model rough surfaces in the specular direction and verify our model with direct reflection measurements on two common building materials, namely ingrain wallpaper and concrete plaster.