Quasi-optics vector measurements of dielectrics from 8 GHz to the THz region

Dielectric characterisation is made easier when using vector measurements. These measurements give directly the permittivity, since the phase rotation corresponds to a lengthening of the optical path across the sample. Measurements that are most commonly done are measurements between horns (most of the time by taking advantage of refocusing lenses). The comparison between the detected phase and amplitude with or without the sample gives the permittivity /spl epsiv/' and the loss tan/spl delta/. The vector analysis (circular shaped resonance in polar plot) allows complete and precise measurement from any form of resonance. Vector measurements in the range of 8 to 1000 GHz are made possible thanks to the vector network analyser.