Measurement complex permittivity of high loss using resonator with ring cavity

We proposed a new complex permittivity measurement technique for high loss liquids in small volume at millimeter wave band. This technique is based on the use of cavity resonator with radial belt with liquid. Such resonant cell was studied numerically and experimentally. The resonator spectrum was studied depending on permittivity of high loss liquids at deviation of main resonator parameters. A good agreement between numerical study and experimental data has obtained. The optimal resonator proportions corresponding spectral parameters and operating oscillation mode were determined to provide maximal sensitivity during complex liquid permittivity measurement.