High Loss Liquid in Layered Waveguide at Microwaves and Applications

The propagation of electromagnetic waves in a circular two-layer metal waveguide with a central low loss dielectric rod surrounded by high loss liquid in the microwave range has been studied. The interaction of the electromagnetic waves with different radial indices has been observed. We have detected owing to a high loss medium, such a waveguide structure does not have a fixed value of cutoff frequencies. We have presented experimental complex permittivity measurement of different water solutions such as liquids food (grape wines/juices) components and also the time interaction of urea-water solution with urease that can find the application in microbiology research. The proposed structure can be applied as a measuring cell for the determination of the complex permittivity of high loss liquids in small volume in wide microwave range from centimeter to millimeter wavelengths.