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A description in given of an unconventional method to a build coherent pseudo-coherent high-duty cycle pulse radar. The proposed method is shown to be applicable both to creating a new generation of millimeter-wavelength radar facilities and to upgrading active microwave-band radars.
A description is given of an environmentally safe multistatic X- and Ka-band marine radar system (RS) intended to guard the sea territorial waters of Ukraine. An alternative variant of using a multistatic radar built on basis of the floating active radio beacons (installed beyond the boundaries of radio horizon) and a single receiving station. The receiving station is located on a coastal line and...
One of the problems in the area of radio wave propagation and radar design is creation of radar facilities for navigation in the regions of the World Ocean with intensive shipping. Ukrainian radio-electronic industry has a large experience in development of different purpose radar systems, one of that is the radar «Burevestnik». This radar is used to control and observe marine surface situation on...
A nonconventional way of construction of two-frequency (X - and Ka-ranges) pseudo-coherent pulsed radar of high porosity is described. It is shown that the offered way can be applied both for creation of radar guidance systems of new generation in the millimeter range of wavelengths, and for modernization of operating pulsed radars of the centimeter range.
The self-consistent mathematical model, in which the space-charge of beams of rectangular section, sagging of fields in gaps are considered, is formulated. It is shown, that calculations electronic power orboklystrons oscillators at frequencies (300…1000) GHz can reach 24-2 W respectively. Amplifiers have the gain of 20–30 dB.
On the basis of developed program considering deposition of current on the slow-wave structure (SWS) the optimal parameters of a 3-mm wave orbotron and klinoorbotron operating at voltage of an electron beam of 3-kV have been calculated. The stratification effect of a beam in orbotron has been studied. It has been shown that the use of klinotron effect results in efficient compensation of stratification.
A technique for parameter checking of oscillatory system of a magnetron is proposed, enabling to determine the cause of appearing of internal defects in the production of oscillators. It is shown that the ways of indirect estimation of "destruction" of spectrum of spatial harmonics of a HF field of a slow-wave structure of anode of magnetron make it possible to minimize the risk of appearing...
Analytical estimation of optimal parameters of pulse magnetron of 8 mm-band with cool secondary-emission cathode operating under 6.5 kV anode voltage in the mode of drift-orbital resonance has been performed. Ability of the magnetron with analytically determined parameters to maintain the required energy characteristics is checked by the use of computational and 3D-simulation experiment. The possibility...
A concept of constructing of magnetrons of a millimeter-wave pi - fnd non p - mode are considered. The perspectives of developing of short-wave magnetrons are presented.
A special consideration is given to the condition under which the competition of modes may exist in a rising-sun pi-mode magnetron as well as to the prerequisites to the stable generation operating on a mode. It is shown, when the space harmonic spectrum contains a pi-mode component with a zero azimuthal number the probability of decreasing its competitiveness tends to grow. The reason why it happens...
Discussed in this paper is competition ability of mm-wave anode and vane-type rising-sun magnetrons operating on pi - modes. Competition ability of mm-wave different-cavity anode magnetron has been determined. This type of magnetron is operating on non - pi - modes.
In mm-wave space-harmonic magnetrons use is made both of the main cold secondary-electron emitter cathode to produce the operating current and of an ancillary cathode with a thermo-electron emitter, which is located at the end of the main cathode to ensure the triggering current. The paper presents the results of 3-D simulation of the magnetron triggering process. It is shown that there exists a relationship...
In the present paper the 3-D model is employed to analyze the electron hub generation process in a magnetron diode with a secondary-emission cathode whose operation is stimulated by priming electrons from ancillary side cathode. It is shown that the electron emitted from the cold cathode areas at the diode ends has an effect upon the rate of space charge density, it is needed to trigger the secondary...
The goal of the present paper is to look into the possibility of constructing small-size pulsed cold-cathode of SHMs at THz frequencies using 3-D numerical simulation. These types of sources whose output power varies between hundreds of mW and units of kW can be employed, say, in developing high-resolution radars as well as in the technology of desk-top charged-particle accelerators, communication...
The aim of the present paper is to address the issues of whether it is possible to designed develop by numerical simulation the electromagnetic continuous-wave THz- sources width electrically tunable frequency. These sources may well find their use, say, in the fields of applications such as the development of THz-spectroscopy, high- resolution radars, communication lines between ultrahigh- speed...
Presented in this paper are the results of 3-D simulation of electron-shell generation in mm-wave secondary-emission magnetron with cold cathode. Here the secondary-electron multiplication is stimulated by primary electrons from additional side cathode with a thermoionic emitter. It is shown that at the given magnetic field value the time of electron-shell generation is the current value of primary...
Presented in this paper is comparative analysis regarding the validity of well-known formulae for the calculation of secondary yield of emitter materials. Optimal spectra of projectile particles during electron shell simulation and secondary-electron multiplication in magnetrons with the basic cold cathode have been defined. Elastically reflected electrons should be taken into account in the models...
Examination has been conducted regarding existence domain limitation for doublet oscillations in equal-resonator system of magnetron anode module. Analytical expressions for the upper boundary of the existence domain of operating modes with the oscillatory system parameters have been obtained.
A great interest has been shown in using terahertz range. Considered in this paper are the possibilities of using frequency multiplication principles in designing vacuum electromagnetic radiation sources featured by inclined electron flow in the short-wave bands including terahertz band. Presented here are the results of simulation and experimental studies of millimeter-wave frequency multipliers,...
In the course of development work on designing millimeter-wavelength magnetrons, many attempts had been made to achieve the regime of interaction between an electron flow and a spatial harmonic of one of the doublet-type oscillation modes. The techniques for establishing the causes that restricted the extent of oscillation in modes for the magnetic field non-pi-mode magnetron and determining the criterion...
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