A.A. Skvortsov - Ph. D. (Eng.), Associate Professor, Department «Electronics and telecommunications», Yuri Gagarin State Technical University of Saratov. E-mail: sotrudniki.1@yandex.ru

One-septum and double-septa waveguides with ledges on ridges, electrodynamic properties of which one usually analyses simulta-neously, belong to transmission lines of complex cross-sections. By changing their geometrical dimensions, it is possible to level the transverse electric field component of the dominant wave. This effect is analogous to the influence of dielectric plates on the transverse electric field component of the dominant wave in a rectangular wave-guide that provides application prospects of the waveguides under consideration as basic elements of microwave systems of different use, including microwave devices for uniform heating of dielectric materials. The important task, arising at the creation of microwave devices based on the transmission lines with the cross-sections under consideration, is the evaluation of cutoff wavelengths of these waveguides. Besides, since these devices operate, as a rule, in one-mode regime, determining the cutoff frequency of the first higher wave of the above-mentioned waveguides is of great practical importance. To know this value is necessary for evaluation of bandwidth ratio of the considered structures. Another important electrodynamic parameter is the impedance of these waveguides. Its value is useful for solving the problem of matching the waveguide channels, for calculating the transmission coefficient of stub branching, as well as for analyzing the reflections from nonuniformities, etc. Using of the equivalent-network method, a quasi-stationary calculation of the electrodynamic parameters of one-septum and double-septa waveguides with ledges on ridges is carried out for different geometrical dimensions and electrical&physical parameters of uniform dielectric filling. Sins the calculations are performed in the first order approach, the results obtained are compared with data, obtained by use of the finite-elements method. As we should expected, obtained approximate-analytical expressions do not provide a high accuracy for calculation of the electrodynamic parameters of the considered transmission lines for all their geometrical dimensions. However, application of the equivalent-network method allows us to find in the explicit form simple approximate-analytical expressions for the cutoff wavelengths of the dominant and first higher wave, for bandwidth ratio and impedances depending on both the geometrical dimen-sions of the considered waveguide cross-sections and electrical&physical parameters of their dielectric filling. Thus, analytical expressions allowing one to evaluate with the accuracy sufficient for practical purposes the influence of geometrical sizes and electrical&physical properties of homogeneous dielectric filling of one-septum and double-septa waveguides with ledges on ridges upon their electrodynamic parameters are obtained on a basis of the equivalent-network method in a quasi-static approach. These expressions can be successfully adapted for calculation of symmetric and non-symmetric one-septum and double-septa waveguides with ledges on ridges, having partial dielectric filling.

 

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