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Microstrip broadband filters based on the multimode resonator, having conductors in the shape of an irregular meander are investigated. The increase of the periods of the meander electromagnetically connected with several single-mode resonators allow considerably to improve frequency selective properties of filters.
Microstrip band-pass filters based on the multimode resonator, having conductors in the shape of a rectangular ring are investigated. Such devices because of the high steepness of slopes of a passband and an extended high-frequency stopband can have high frequency selective properties.
Numerical calculations of the fundamental mode oscillations and H11 mode oscillations for helix slow wave structures (SWS), applied in broadband TWTs were made. Calculations were performed for three versions of a construction with various type and quantity of vane on an envelope. Cutoff frequency H11 mode, electrodynamics characteristic and frequencies of π-type of the fundamental mode are calculated...
The solution for the diffraction problem of scattering of magnetostatic waves by an arbitrary shallow defect situated under the surface of a ferromagnetic film magnetized at an arbitrary angle is obtained in the quasi-static approximation. Expressions for the energy flux density of scattered magnetostatic waves in the far-field zone are found.
In this paper, we present study on surface acoustic waves excited in barium — strontium titanate films fabricated on magnesium oxide substrate by interdigital transducers. The surface acoustic waves propagation was simulated by using COMSOL Multiphysics™. The presence of bias, since the oscillations are not considered as sagittal polarized, is the principal difference between considered problem and...
The Bragg-diffraction-based method of visualization of in-plane distributions of heterogeneous acoustic fields with the use of two-stage Fourier transformation is considered. In comparison with the popular Corpel technique of Bragg visualization the proposed method is free of the astigmatism. The equations for calculating optic image of acoustical object are given.
A fast and accurate code for calculation of eigenwaves in grating slow-wave structures (SWS) is developed. Such SWS are used in sheet-beam traveling wave tubes (TWTs) and backward-wave oscillators (BWOs) at sub-THz and THz frequencies. Results of numerical modeling of SWS for a G-band sheet-beam TWT are presented.
The principles of creation of TWT terahertz range are considered. Three electrodynamic models for slow-wave system (SWS) type comb to comb dielectric substrate in a rectangular screen have been obtained, and the calculated dispersion presented. The first model is based on the method of Green's functions and integral equations. The second model is based on the G.T. Markov formulas of excitation of...
Theoretically and experimentally radiofrequency identification system on surface acoustic waves in the 6 GHz band was studied. The SAW tag calculations take into account the finite thickness of the electrodes, difference the acoustic properties of a thin film of aluminum, bulk scattering and energy dissipation of SAW during reflection from the electrodes. Calculated test tag was made using electron...
Approximate analytical expressions allowing carrying out quasi-stationary calculation of cutoff lengths of dominant waves of double- and four-ridged waveguides with layered dielectric filling of their central sections when interfaces are perpendicular to the force lines of electric field are derived with the help of the equivalent network method and using computer at the final stage of obtaining numerical...
The results of the study of coupled cavities chains with periodic discontinuities taking into account changes the spectral composition of the field harmonics are presented. Investigated individual bandpass components and stop bands between them in a inhomogeneous system. The connection the values of the bandpass components displacement and stop bands width between them with the type, size and number...
Analytical mathematical models for magnetic and electric fields of a three-phase air transmission lines which allows to calculate the field strength at a large distance from the line were developed. We calculated values of the field strength for high-voltage lines, justifying the possibility of detecting air lines by aircrafts during low-altitude.
The article discusses the concept of a device for measuring the permittivity of dielectric materials. This device is a single-ridged waveguide. Measurements are supposed to be carried out by the transmission of electromagnetic waves and assessment of the distribution characteristics.
A new dual-mode double-gap resonator on the basis of asymmetrical suspended stripline for miniature klystron type microwave tubes with field emitter arrays (FEA) cathodes was investigated. The resonator has a smaller size and mass when a doublegap capacitive segment of each quasi-lumped resonator consists of two assimmetrical strip conductors on opposite sides of the substrate and both inductive segments...
Results of numerical 3D — modeling of a new type of double-mode multibeam klystron resonators with the sector shape of the cavity are presented. Assess the efficiency of quarter-wave and half-wave designs sector double-gap resonators when setting both the mode of interaction of the electrons with the microwave field at multiple resonant frequencies corresponding to the fundamental frequency of the...
Results of numerical 3D-modeling of a new type of double-mode multibeam klystron resonators with the sector shape of the cavity are presented. Assess the efficiency of step-inhomogeneous designs sector resonators when setting both the mode of interaction of the electrons with the microwave field at multiple resonant frequencies corresponding to the fundamental frequency (2450 MHz) and twice frequency...
The K-band three-cavity multi-beam transit-time effect oscillator (3K MTTTO) is a novel high power microwave device based on the transit-time effect of the three-cavity (3C) resonator. Electronic and electrodynamic parameters of 3C resonator were calculated. The ranges of accelerating voltages were founded at which self-excitation of monotron possibly.
The article describes the various design solutions of software-defined radio based on a multi-port reflectometer, including its use in modern wireless communication systems. The advantages of Substrate Integrated Waveguide before microstrip circuits for use in multi-port junctions discussed.
This article describes the benefits of using the method for evaluation of uncertainties of errors arising during the operation and calibration of multi-port transmission line reflectometer. The expressions for measurement uncertainties caused by different sources are given.
This article describes a new dual mode two gaps resonator with the suspended ceramic substrate and the asymmetric strip lines. Using the asymmetric helical strip lines in resonator we can tunes it to anti-phase oscillation and to in-phase oscillation at the doubled frequency at the same time. On the basis of the 3-D modeling we found that such oscillatory systems can achieve the excitation of these...
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