Millimeter wave material characterization using FMCW-transceivers

In this paper, ultra-wideband frequency modulated continuous wave (FMCW) radar transceivers are used to measure the complex permittivity of dielectric materials. The radar transceivers are used to perform fast and accurate measurements from 200 GHz to 250 GHz within milliseconds. The dielectric constant and losses are determined using a free-space reflection measurement at normal incident on a given material sample. The FMCW transceiver is calibrated using adopted methods from vector network analysis.