Free-space quasi-optical spectrometer for material characterization in the 50–500 GHz frequency range
Proceedings article published in 2014 by
Alireza Kazemipour,
Martin Hudlicka 
,
Mohammed Salhi,
Thomas Kleine-Ostmann,
Thorsten Schrader
,
Mohammed Salhi,
Thomas Kleine-Ostmann,
Thorsten Schrader
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Abstract
A compact free-space setup is designed based on 90-degree off-axis parabolic mirrors and pyramidal horn antennas to cover a wide frequency range from 50 GHz to 500 GHz. A commercial VNA with frequency extenders is used to measure s-parameters and provide raw data to extract intrinsic material characteristics. The calibration process is simplified and a method is presented to extract both real and imaginary part of permittivity. Several materials were measured and the extracted parameters are presented.