Improved Free-Space S-Parameter Calibration

An improved method for performing a full two-port s-parameter calibration in free-space is presented. The proposed calibration technique computes the error coefficients from measurements made on an empty fixture and a measurement made on a metal plate of known thickness. Time-domain gating was employed. This technique requires fewer and simpler standards than the existing TRL and TRM calibration techniques. Permittivity calculated from measurements, calibrated using this technique, made on a material sample appear to be superior to results published using the TRL and TRM calibration technique