Quasi-optical measurement technique for low-loss materials in short millimeter and submillimeter wave ranges

This study presents a set up for measurement of different low-loss materials and substances (liquid and solid-state dielectrics, ferroelectrics, semiconductors, ferrites, composite, building, nature and commonly used materials and media) in short millimetre (MM) and submillimetre wave (SMM) ranges, mainly at the wavelengths /spl lambda/ = 3.0 - 0.6 mm. This measurement technique for materials investigation in MM and SMM ranges uses quasi-optical lens beam waveguide spectroscopy methods. This version of MM and SMM spectroscopy has some advantages in frequency range 50 - 500 GHz.