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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

  • Research of microwave processing systems for processing solid and liquid media

    The possible ways of research and development of management of ultra-high-frequency technological complex for the treatment of solids and liquids accumulated in waste storage on horse and livestock farms. Given a classification assessment of existing and proposed integrated model thermoelectrochemical approaches that account for physico-chemical composition of the treated medium. The results of laboratory experiments on drying of processed substances for the justification of integrated management and development of real microwave technological complex are presented.

    Keywords: dielectric, dielectric permittivity, microwave heating, humidity, waste, physicochemical composition, mathematical models, technological complex

  • 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

  • A complex method for measuring the permittivity in the low-frequency and microwave ranges

    In this article, we propose the idea of ​​creating a complex sensor for measuring the dielectric parameters of liquid substances in order to distinguish samples with small changes in the parameters in low-microwave ranges. The measurements are carried out by a capacitive method. For measurement at a low frequency, a capacitor-to-code converter is used; in the microwave method, a vector analyzer is used for the measurement. As a capacitive sensor, a interdigital capacitor is used that has geometrical and electrophysical parameters, in which it is not a radiating structure in the range of controlled frequencies. To combine the low-frequency and microwave methods in one sensor, a frequency-isolation scheme is used. The urgency of the method lies in the absence of the need for separate measurements of the sample with the help of various sensors.

    Keywords: interdigital capacitor, coaxial probe, frequency isolation circuit, liquid substance, sensor, model, reflection coefficient, electrical capacitance, capacitor-code converter

  • Formation of Fano resonance in a microstrip microwave structure

    The article presents the results of simulation of the microstrip microwave structure of the ring configuration, which, by analogy with the fiber-optic prototype, embodies the principle of Fano resonance formation. This type of resonance is characterized by the asymmetry of the shape and has a narrower resonance than the classical Gaussian and Lorentzian forms.

    Keywords: Ring resonator, Bragg reflection, Fano resonance, phase shift

  • To the question of improving the characteristics of coaxial Bragg microwave structures as converter elements of sensory devices

    The article presents the results of increasing the sensitivity of the transformation elements on the basis of coaxial Bragg microwave structures, possible in two versions of the structure modification. In addition, an example of the configuration of the pressure control is given.

    Keywords: coaxial waveguide, bragg structure, bragg reflection, pressure sensor, microwave sensor

  • 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

  • Passive optical and coaxial microwave structures with periodical heterogeneities: sensor technologies transfer

    The paper discusses passive microwave structures with periodical heterogeneites in the coaxial cable that are based on optical technologies transfer similar to the fiber Bragg structures. Among the considered: Bragg, long-period and chirped gratings, Fabry-Perot interferometer, couplers. Results and analysis of the main methods of coaxial Bragg microwave structures modeling, including the method of coupled modes and the method of directed graphs are described and discussed. Obtained spectral characteristics of these structures in their experimental implementation are presented. The main production technology of coaxial Bragg microwave structures and their impact on the specified spectral characteristics are defined. Embodiments of said microwave coaxial Bragg structures using in sensor applications are shown. In particular, we discuss the creation of mechanical strain, dielectric parameters of liquids and the level of liquid products sensors.

    Keywords: Bragg microwave structures on the coaxial cable, modeling, method of directed graphs, method of coupled modes, sensor applications, deformation, dielectric permittivity, level meter

  • Active optical and microwave elements with periodic structures, located in the near radiation zone: sensor technologies transfer

    The paper discusses the active microwave elements with periodic structures, located in the near ​​radiation zone, that are based on optical technology transfer by analogy with controlled electro-layered structures. Among the considered: microwave antenna with controllable operating wavelength and radiation pattern width and its analog - selective multilayer dielectric mirror. Results and analysis of the main methods of modeling of microwave antenna and its periodic structure are discussed. Obtained characteristics of antennas in their experimental implementation are presented. The basic technology of antennas manufacturing and influence of their periodic structures manufacturing quality to accurately reflect the operating wavelength and the width of the pattern to the desired value are defined. Applications of antennas designed as shapers of the probing radiation in sensor and medical applications are shown. In particular, we discuss the creation of dielectric permittivity sensors and microwave treatment systems with controllable wavelength.

    Keywords: microwave antenna with a periodic structure, located in the near radiation zone, selective multilayer dielectric mirror, modeling, working wavelength, radiation pattern, sensor applications, the dielectric permittivity