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We have studied the multigap resonance system, which is a rectangular cavity resonator with two suspended ceramic substrates, on which the two sides is applied by lithography strip line. During modeling process the resonator structure was calculated on three main modes with a maximum characteristic impedance, antiphase oscillation mode (π), π / 2 oscillation mode and in-phase mode (2π) oscillation...
Microplasma microwave sources are widely used in a bio-microelectromechanical sterilization systems, in materials processing, in a microchemical analysis systems. The possibility of ignition of microwave low-power plasma using ring microstrip resonators tuned to the frequency of 900 to 1500 MHz was investigated. We have simulated the ring resonators with microstrip gap size of 100 to 500 microns....
In this paper we propose an approach for the study and forecasting of the UAV fuselage stability at impact lightning. Example of forecasting the electromagnetic stability and thermal stability of the compartment UAV fuselage which made of composite material is discussed. The analysis of the study results shows the need to use technical measures to improve the stability of the UAVs fuselage at impact...
This paper reports the general view of continuous high-power TWTs manufactured in Stock Company «Reseach-and-Production Enterprise «Alm«z», designed in recent years. Also general parameters of high-power broadband helix TWTs in the range from 1 to 18GHz are presented. The width of the most TWT's frequency range — octave or more. TWTs has the output power from 500 to 1500 W. For some TWTs is described...
The article considers the possibility of using the ridged waveguide as a measuring cell of devices for determining permittivity of materials. The calculations of electromagnetic fields of hybrid waves were performed for the ridged waveguide with the piecewise-layered dielectric filling by the method of partial regions in view of the behavior features of electromagnetic fields on the dielectric and...
The diplexers based on 2D electromagnetic crystal are investigated with the help of the numerical electrodynamic analysis of 3D models. The input half-wave resonator has rolled up strip conductor in the claimed microstrip designs tuned with nearly adjacent bandwidths. It allows to coordinate channels rather easily. Such resonator in the first two-channel device at the same time interacts with pair...
The investigation of sensitive element on the planar mushroom-shaped metamaterial are considered. The results of numerical simulation sensitive element for measurement of physical quantities and monitoring parameters of technological processes using CST Studio Suite are presented. Also it is shown that the microstrip sensitive element has geometrical dimensions much smaller operating wavelength while...
The theoretical and experimental results of the design of new multiband radio frequency identification tags on surface acoustic waves in the frequency range 860–960 MHz were obtained. The tag contains three interdigital transducer, combined into a single microwave line. The necessity of using the multi-interdigital transducers is shown. The possibility of synchronous detection of up to a million tags...
Methods are presented for creation of technology of production of graphene materials with the developed surface, containing different functional groups and wares from these substances as electrode materials of stores of energy. Applications developed graphene materials gives a large effect in such areas as the electrically conductive composite materials, coatings, shielding or reflecting electromagnetic...
Results of theoretical studies of interaction of sheet electron beam with a zero space garmonic of comb slow-wave structure are presented. The gain and the efficiency are calculated for different input signal levels and the inclination angle of the electron beam relative to the surface of the slow-wave structure. The results obtained have broadened the concept of clinotron as a terahertz-wave radiation...
The paper presents the results of numerical simulation of a miniature dual bean monotron with three-gap resonator, made by technology of integrated circuits. Was studied the stability of this device to different oscillation modes. It is shown that when working on main mode output power of the device on the 2,2 GHz is in the range from 150 to 350 watts with the change cathode voltage from 2 to 3,5...
The analysis of the waves properties with complex propagation constants in periodic structures without disturbing the periodicity. The results of the electrodynamics characteristics research of different type structures in the wide range of frequencies are presented. The main attention given to study the phenomena the interaction of the normal waves of periodic structures with formation the stopbands...
The results of the research management capabilities of dispersion characteristics folded-waveguide with drift tubes according to functionality of system of designed TWT millimeter wavelength range. The proposed modifications of the folded-waveguide with an offset of waveguide side walls relative to coupling slots provide an effective dispersion management in the operating frequency range. Constructive...
The results of numerical investigations of electrodynamic characteristics of multibeam triple-gap resonator with two spaced beams of millimeter wavelength range are presented. The possibility of achieving the multiplicity equal to three ratios of frequencies the two higher modes to the frequency of the main mode is shown. Setting the frequency of the investigation modes was made by changing the parameters...
The authors presented a technique of calculating the strength of the electric component of an electromagnetic field for solving problems of electromagnetic microwaves propagation in radio electronic devices for different purposes. The technique is based on representing the surface reflection of electromagnetic waves in the form of a set of elementary emitters, for example, of Hertz elementary electric...
The results of the calculation of the distribution of the magnetic field in the magnetic periodic focusing system with different screen configurations are presented. The calculations of the electron beam trajectories in the gun for different values of the field at the cathode are showed. The values of the magnetic field at the cathode depending on the ratio of the diameter of the screen to the outer...
A method of synthesis is developed, equations are derived and results are obtained via this method for simulation of magnetically shielded electron-optical systems that form sheet electron beams with compression. Relation that allow determination of the parameter of the electron guns and deformation of cross-section sheet electron beams in the magnetic field are presented Electron-optical systems...
The application of the voltage converter for the broadband microwave voltage controlled oscillator (VCO) is considered in this paper. Special attention is paid to additional phase noises of VCO by called use of the diode voltage converter. Studies showed, that at analysis frequencies more than 10 kHz additional phase noise spectral density can be reduced due to decrease of the converter load resistor...
The natural frequencies of the multimode microstrip resonator «hairpin with stub» were investigated from its constructive data. Application in the resonator of the stub allows not only to observe on amplitude-frequency characteristic the poles of power attenuation, and also to considerably reduce frequencies of all its even modes of oscillations. At the same time frequencies of odd modes don't change...
The method of digital calculation of noise figure for helix TWT using 2d code are presented. The electron beam in helix structure enter was obtained after electron gun calculation with current and velocity modulations on cathode. The zero initial conditions for electron beam in helix enter for interaction calculation was changed by conditions which taken into account current and velocity modulations...
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