The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The problem of microwave tube collectors simulation using two- and three-dimensional codes (EOS-2 and EDS-3) are considered. The self-consistent solution of the fields and electron trajectories on the two dimensional levels have been obtained taking into consideration the secondary electrons from collector surfaces. The method of calculation of the asymmetric collectors is developed on the basis of...
The authors present the results of simulation of the Cyclotron Protective Device (CPD) electron-optical system with a ribbon electron beam. We have determined the dependence of the form distortion of the ribbon beam cross section on the axis distribution function of the focusing magnetic field, which influences electron beam transportation to collector. The electron beam focusing conditions in the...
Based on the analytical theory using the successive approximation method, the behaviour of resonance microwave oscillators of the orotron-type is investigated in the steady-state mode and stabilizing one of the hard excitation oscillations and the slow variations of the accelerating voltage. The dependences of the stationary amplitude of the orotron and stabilizing time of oscillations on the transient...
The steady-state characteristics of the hybrid O-type device for different input amplitude values are investigated. The analysis is carried out on the basis of the multidimensional nonlinear theory. The reasons for the output signal level decrease for particular input amplitude values are considered. The possibility of this phenomenon compensation due to interaction efficiency enhancement in the output...
The transcendental dispersion equation was obtained and analysed by linear approximation. Such equation describes electron-wave mechanism of oscillation amplification based on coherent Smith-Parsell effect, which realized in the open wave-guide - periodic structure system. The capacity of energy transmission from electron beam to electromagnetic field by fast mode of space charge and extending wave...
In this paper the results of the design of high-power klystrons with a reduced collector potential are presented. It is shown that application of regeneration in klystrons used in the output amplifiers of TV transmitters makes it possible to increase the klystrons' efficiency up to 1.8-2.0 times. The aim of this paper is to create microwave electrovacuum devices (klystrons and TWTs) for TV and communication...
The synthesis algorithms of geometric parameters of the coupling of cavities and slots for irregular slow-wave structures are indicated. The results of calculations of the parameters of irregular slow-wave structures are presented.
The principle of operation, structure and main parameters of cyclotron protected complex amplifiers are described. The main advantages of these devices are reliable protection of radar receiver input cascades against microwave overloads and super short recovery time of their sensitivity.
HCN hyperhigh-frequency discharge laser for biomedical investigations in clinical conditions is described. This laser is handy, easy and foolproof. It is pumped by alternating current. The gas discharge excitation is realised with the original electrodes placed outside the quasioptical resonator of waveguide type. The laser radiation parameters are presented.
The source of dense low-temperature plasma (plasmatron) is widely used in physical experiments and engineering. In this device, a cold working gas is blown through the discharge region The torch produces cold plasma. The structures and characteristics of plasma are determined by electrodynamics properties of plasmatron. The goal of this work is the investigation of plasmatron electrodynamic characteristics...
The results of measuring a series of electrophysical characteristics determining the operation of a microwave plasma generator, based on a rectangular shaped resonator with partial filling of the resonating volume with plasma, are presented. It was established that the allocation of the microwave field and local electrical plasma conductivity according to the length of the discharge area shows a periodic...
Described in this paper are unified design and electronic lithography-based technology of production of low-noise Schottky FETs. HEMT and PHEMT series for 3-60 GHz frequency band have been manufactured.
The problem of predicting, by computer-aided means, the complex phenomena observable in the dynamic response of microwave injection-locked pulsed-oscillators (ILPO) under both continuous-wave and modulated input signal drive is addressed. The proposed method makes use of characterization data taken on ILPO under both short- and long-pulse (or non-pulsed) sinusoidal operation in order to derive a nonlinear...
Describes microwave power transistors, developed in SRPC "Istok". Characteristics of power GaAs MESFETs and their applications are presented. Power MESFETs have output power density of 0.5 W/mm, power-added efficiency of 35% and thermal resistance of 10-12/spl deg/C/W (for MESFET with total gate width of 4 mm).
This paper describes the design of a single-ended power amplifier at X-band for high efficiency performance using a state-of-the-art power heterostructure FET (HFET) device operating in class AB/F. The 4.8 mm gate HFET was modelled by scaling the small- and large-signal models representing the 2.4 mm unit-cell HFET. Conventional MIC technology was employed for practically realising the design. The...
Described in this paper is a superbroadband low-noise microwave FET amplifier of hybrid-integral design. The amplifiers have demonstrated the low-noise figure of 6.0 - 7.0 dB at 20.0 - 25.0 dB gain, output power 35 mW (linear mode) in 1.0 - 18.0 GHz frequency band.
The given paper considers the results of investigation of a human skin response to external low intensity microwave radiation. Dissipation of absorption power of a biologically active point (BAT) was obtained. The value of maximum BAT sensitivity to microwave radiation was determined.
Presents the results of development and adoption of MITRIS-M system near Novgorod-Siversk (Chernigov region). The system includes high-power 4-channel microwave subsystem with radius of service zone up to 50 km, low-power 12-channel microwave subsystem with radius of service zone up to 10 km and a set of low-power retransmitters in the decimeter waveband.
Presents the results of creation of interactive services, provided by MITRIS system. The services are described: reporting transmission via MITRIS network; radio channels allotment; Internet access; and radio-broadcasting. The authors examine the possibility of creation of the second and the third level services on the basis of MITRIS system.
Described in this paper are the principles of implementation of low intensive microwave processing in industry and agriculture. Those principles are based on the following concept: at each stage of life cycle the solutions accepted should correspond to condition of minimal expenditures of HF electromagnetic energy. The review of the basic key directions is given (the choice of cost effective processing...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.