Influence of high loss liquid on the bandwidth of a circular two-layer waveguide at microwaves

ABSTRACT

The electromagnetic waves propagation in a circular two-layer metal waveguide with a central low-loss dielectric rod surrounded by high loss liquid is studied in the microwave range. The dependence of the complex wave propagation coefficient on frequency and liquid layer thickness is obtained. The presence of high loss liquid surrounding the dielectric rod allows expanding the range of operating wavelengths of the standard waveguide from the millimeter to centimeter range, because the wave attenuation coefficient remains relatively small. We find that owing to a high loss liquid, such a waveguide does not have fixed values of cut-off frequencies. An extra low value of the wave attenuation coefficient is found in the centimeter wavelength range at certain liquid layer thicknesses. The proposed structure can be applied as a measuring cell for the determination of the complex permittivity of high loss liquids in small volumes and in a wide range of wavelengths.

KEYWORDS:

• Attenuation coefficient
• cut-off frequency
• centimeter wave
• circular layered waveguide
• complex permittivity
• high loss liquid
• millimeter wave

Acknowledgement

We would like to thank Professor Alexander I. Nosich for valuable comments and fruitful discussions to make our paper better.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Zoya E. Eremenko http://orcid.org/0000-0002-9635-2611

Additional information

Notes on contributors

Kateryna S. Kuznetsova

Kateryna S. Kuznetsova received the MSc degree from Karazin Kharkiv National University, Kharkiv, Ukraine, in 2011. Her current research interests include wave propagation in the resonator layered structures with high loss liquids and chaos phenomena microwave resonator modeling.

Zoya E. Eremenko

Zoya E. Eremenko (IEEE SM'05) received the MSc degree in radio technology from Kharkov Aviation Institute, Kharkov, Ukraine, in 1984, the PhD and DrSc degrees in Physics and maths Sciences at the Usykov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, Kharkov, in 1996 and 2011, respectively. Her current research interests include wave propagation in the resonator layered structures with high loss liquids and chaos phenomena microwave resonator modeling.