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The waveguide method for the determination of complex permittivity of high loss liquid at the frequency range 5÷40 GHz

The propagation of HE11 mode in a circular two-layered waveguide was used for high accuracy complex permittivity determination of high loss liquids at frequency range from 5 to 40 GHz. The complex permittivity was calculated by phase and attenuation coefficients of given wave in the circular two-layered waveguide with a centered dielectric rod with small losses and a layer of measured liquid. We have studied the complex permittivity of the following liquids: water and water-ethanol solutions (up to containing 60 percent of ethanol). The high loss liquid surrounded the rod and allows extending from millimeter up to centimeter operating wavelength range with relatively low attenuation coefficient. The maximal sensitivity of the method of complex permittivity determination of absorbing liquid for using an optimal liquid layer was obtained. The proposed measuring waveguide structure can be used for the complex permittivity determination of the high loss liquid in a small volume in a wide microwave range.