Complex Permittivity of Typical Construction Materials over 40–50 GHz

Complex permittivity of construction material at millimeter-wave (mm-Wave) frequency band is a key parameter which impacts the propagation of mm-Wave greatly. Although measurements on permittivity of building materials have been performed at several specific frequencies in mm- Wave band, the wideband information over 40 GHz to 50 GHz is absent. This paper investigates the complex permittivity of four construction materials, which are granite, marble, wooden board and polyvinyl chloride (PVC) board, over 40 GHz to 50 GHz by free-space measurement. Complex permittivities are extracted from transmission coefficients and verified by reflection coefficients. The results of this work are especially useful in mm- Wave channel modeling for fifth-generation (5G) wireless communication.