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  • Analysis of the influence of step irregularities of the inner conductor on the frequency characteristics of a piecewise homogeneous Bragg microwave structure in a coaxial waveguide

    The work is devoted to the analysis of the frequency characteristics of a piecewise homogeneous coaxial Bragg microwave structure with irregularities in the inner conductor. The article presents varieties of piecewise-homogeneous Bragg coaxial microwave structures, their options for practical application and implementation, as well as the possibility of their modernization, and also considers a recurrent method for calculating a piecewise-homogeneous transmission line. The possibility of using lumped capacitances in an equivalent circuit is considered and simulation is carried out in the electrodynamic simulation program with initial parameters.Based on the results of the work done, it was concluded that the effect of lumped capacitances included in the equivalent circuit of a piecewise homogeneous coaxial Bragg microwave structure significantly improves the frequency characteristics of a single-wave calculation in comparison with full-wave simulation. When approaching conditions favorable for the propagation of the first highest mode, it is necessary to include the effects of its propagation in the calculation.

    Keywords: Bragg microwave structure, reactivity, permittivity, coaxial cable, microwave range

  • Dielectric waveguide with periodic inhomogeneities as a method for measuring the characteristics of dielectrics

    This article discusses various configurations of dielectric inhomogeneous waveguides in the microwave range, discusses the results of computer electrodynamic modeling of the proposed configurations of structures with periodic inhomogeneities. During the simulation, the geometric and electrophysical parameters of the periodic structure were varied in order to identify their influence on the characteristics of the proposed sensor to determine the properties of liquid dielectric media.

    Keywords: dielectric waveguide, Bragg reflection, dielectric constant, reflection coefficient

  • Mathematical modeling of controllable frequency-selective surfaces

    The article discusses the relevance of the research of new coatings to control their properties. At the beginning of this article provides an overview of existing methods of creating frequency-selective surfaces. Further considered controlled by a frequency-selective surface. Also refers to the design created surfaces. At the end of the article is an analysis of the results on the study of controlled frequency-selective surfaces, comparisons with previous results.

    Keywords: Control, frequency-selective surface, microwave, radio-absorbing material

  • Realization and experimental study of a dielectric cylindrical SHF waveguide

    Results of realization of a cylindrical dielectric wave guide of the SHF oven of range with the entered periodic not uniformity are presented in article. Besides the question of a research of influence of phase shift on the characteristic of a dielectric wave guide, and also dependence of change of characteristics on the provision of polarization of the field is brought up.

    Keywords: SHF dielecric cilcular waveguide whith bragg periodic inhomogeneities