Millimeter Wave Material Measurements for Building Entry Loss Models Above 100 GHz

In this paper typical building material transmission measurement results up to 330 GHz are presented. This research is done, in order to further advance building entry loss (BEL) models and estimations for frequency ranges beyond the current ITU recommendations, which are limited to 100 GHz. For this purpose, a quasi-optical measurement setup is provided to investigate on reflection and transmission properties of e.g. bricks, concrete, drywall, and wooden materials. A special focus is laid on window glass panels, since it is expected that free apertures such as windows and doors contribute the most to the total transmission into and out of buildings in this frequency range. The setup is based on a vector network analyzer with millimeterwave extensions and is fully calibrated. The materials transmission attenuation is measured and an attenuation coefficient is extracted from the measurement to provide a compact model and to extrapolate the materials' behavior.