Precise dielectric measurement of low loss materials at 60 GHz

The permittivity and loss-tangent of a number of low-loss materials have been measured using the open-resonator system by two methods - the full cavity-length variation technique and the frequency variation technique. While excellent agreement and consistency in results were obtained by both methods, the measured results showed that the cavity-length technique is a little more accurate with a less-noise resonance peak profile. An extensive error analysis is made for the first time for various open resonator measurement methods for a number of specimens of different thickness.