Semicoaxial waveguide with elliptical cross-section as new type of microwave transmission line

Igor Zavislyak; Hryhorii Chumak; Vladyslav Hnapovskyi

doi:10.3103/S0735272722060012

Authors

Igor Zavislyak Taras Shevchenko National University of Kyiv, Kyiv, Ukraine http://orcid.org/0000-0003-0161-4197
Hryhorii Chumak Taras Shevchenko National University of Kyiv, Kyiv, Ukraine http://orcid.org/0000-0002-2070-9709
Vladyslav Hnapovskyi Taras Shevchenko National University of Kyiv, Kyiv, Ukraine http://orcid.org/0000-0003-0109-7871

DOI:

https://doi.org/10.3103/S0735272722060012

Keywords:

semicoaxial waveguide with elliptical cross-section, working range, T-wave, wave impedance, 3D printing

Abstract

A new type of transmission line representing a semicoaxial waveguide with elliptical cross-section has been proposed. A prototype of such waveguide using the 3D printing technology was created. The transmission coefficient of semicoaxial waveguide with vertical section was measured revealing a quantitative agreement of experimental results with the proposed theory. The possible expansion of working range by 0–30% has been demonstrated in a semicoaxial elliptical waveguide with vertical section that is of practical value. Analytical expressions for wave impedance, transmitted power, losses per unit length of semicoaxial waveguide with elliptical cross-section during the propagation of T-waves therein were obtained. It has been shown that analytically defined losses in metal walls of semicoaxial waveguide agree with the results of simulating its electrodynamic characteristics while using the finite element method (FEM). It was shown that the semicoaxial waveguide with elliptical cross-section and vertical section with air filling could be used in the working frequency range up to 150 GHz in the case of the waveguide planar version.

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