Radio Electronic Devices Research Articles

FLEXIBLE PROTECTIVE MICROWAVE SCREENS ON THE BASIS OF THIN CONDUCTING FIBERS

The development of radio communication, television, radiolocation, remote information processing systems led to the appearance of an intense electromagnetic background in our environment. In many cases, it is the cause of the disturbance of the correct functioning of biological objects, a hindrance to the operation of radioelectronic devices – information transmission systems and military equipment. Therefore, there is a need to protect objects from electromagnetic radiation. Special attention is given to the development of screens and coatings, the effectiveness of which is achieved through the absorption of electromagnetic radiation, since the reflection of electromagnetic radiation often has a negative effect associated with the formation of a rereflected wave affecting the screened object. Moreover, it can help to identify an object by external sensors in cases where it is undesirable. The effect of an anomalously large absorption of microwave radiation by conducting fibers is observed when electric vector of an electromagnetic wave incident on the fiber is parallel to the fiber axis. The possibility of using this effect to create protective screens is considered in this paper. The study has showed that electromagnetic radiation is very strongly absorbed and scattered by thin conducting fibers if the electric vector of the wave is parallel to the fiber axis: the values of the absorption and scattering efficiency factors can reach several hundreds and even thousands, that is, the effective absorption and scattering cross sections can be in several hundreds or thousands times higher than the geometric cross sections of the fiber. This is a size effect, the nature of which, perhaps, is related to the effective excitation of currents at certain ratios between the fiber diameter and the wavelength of the radiation. Also in the work, the advantages of graphite fibers in front of metal ones as a material for absorbing screens have been experimentally proved. The results of the study can be used to create protective microwave screens.

Анализ полосковых структур радиоэлектронных устройств с уменьшенными вычислительными затратами

Анализ полосковых структур радиоэлектронных устройств с уменьшенными вычислительными затратами

Heat transfer and performance analysis of thermoelectric stoves

Access to electricity is one of the important challenges for remote poor regions of the world. Adding TEG (thermoelectric generators) to stoves can provide electricity for the basic benefits such as: operating radio, light, phones, medical instruments and other small electronic devices. Heat transfer analysis of a multi-purpose stove coupled with 12 TEG modules is presented. This analysis comprises a well aerodynamically designed combustor, finned TEG base plate, cooker and water heater beside the outer surface for space heating. Heat transfer analysis was also carried out for all the subcomponents of the stove, and performance predicted against the experimental results.It was found that the maximum power obtained is about 7.88W using wood, manure or peat with an average overall efficiency of the stove about 60%.

Detection of deteriorating technical state of aviation radio electronic devices

Detection of deteriorating technical state of aviation radio electronic devices

Оптимизация комплексного показателя надежности радио­технических устройств путем изменения их топологии

The authors consider problems of determination of reliability parameters for designs of radio engineering devices (RED) under the influence of mechanical and thermal (external and internal) factors. Mechanical factors (linear acceleration, vibration, impact) cause mechanical effect on the outputs of elements of electronic structure (EES) and soldered connections, which can result in decrease of reliability. External thermal effects and internal heat release in the elements of the electronic structure of radioelectronic devices raises the temperature of these elements, thereby reducing the reliability not only of the elements, but of the device as a whole. The paper presents the methods for determination of versatility indicators of reliability depending on mechanical and thermal effects on REDs. Optimization of configuration of the cell (topology) using computer programs allows reducing mechanical and thermal effect on the outputs of EESs and to obtain maximum parameters of reliability of a design. The optimum topology of a cell obtained by such program is illustrated. As a result of optimization, reliability of cells has increased.

Parameters of radioelectronic devices, which are determined by thermal modes

Parameters of radioelectronic devices, which are determined by thermal modes

Анализ физики отказов для оценки показателей надежности радиоэлектронных приборов современных радиолокационных систем

Анализ физики отказов для оценки показателей надежности радиоэлектронных приборов современных радиолокационных систем

К вопросу о надежности радиоэлектронных средств на наноприборах

К вопросу о надежности радиоэлектронных средств на наноприборах

Problem and solution for monitoring of exposure of ionizing radiation of space on radio electronic devices of spacecrafts

A dose rate data on different spacecrafts at circular orbit ~20000km were obtained, also a comparison between the flight data and space models was made and anomalous perturbations of ionizing radiation of spacecrafts was traced. These abnormal disturbances are correlated with GOES data and with International Space Station data, and also with ground based measurements of neutron monitors.One of the elements of industrial system of monitoring is a local ground forecast station, which provides forecasts of geophysical conditions, including the forecast of the proton increase, geomagnetic forecasts, forecasts of relativistic electrons, and produces an alert signal when protons and electrons increase.

ESPECIALLY SHARING MELTING HEAT STORAGE SYSTEMS AND ADDITIONAL HEAT REMOVAL

В статье рассмотрены различные конструктивные варианты устройств для охлаждения радиоэлектронных устройств работающих в повторно-кратковременных режимах.

Book Review of Non-Traditional Dynamics in Electronics: Theory and Practice

The new book published by Scientific Research Publishers, USA in 2011 is devoted to investigation of properties of dynamic radio physical systems and to development of methodic fundamentals for creation the chaotic oscillation sources and forecasting of nonlinear dynamic system behavior at variation of its parameters. The urgency of such investigation execution in this direction is determined both by the necessity of new ideas development in understanding of nonlinear dynamics of various processes independently upon its affiliation with the specific physics area and by need of the modern radio physics and radio electronics in sources of wide-band chaotic oscillations and signals. This book makes a considerable contribution in this area because it contains theoretical, modeling and experimental results of the analysis of bifurcation phenomena and processes in chaotic systems as well as issues of information transmission using chaotic signals. In this book for the first time the auto-parametric scenario of stochastization is described, conditions are formulated, at which movements in arbitrary dynamic systems are governed by the unified system of spectral-time equations. Phenomena of synchronization of chaotic movements and the intermit synchronization are discovered and investigated in detail. The bifurcation sense of the control parameter of modified logistic map is revealed, which ensures reproduction of strictly chaotic temporal sequences. The aggregate of this book’s results may be classified as the new large scientific achievement. Authenticity of results obtained is determined by its consistent (became classical) laws of dynamic system functioning and coincidence of numerical and physical experiments at testing of offered mathematical models of dynamic systems, and successful functioning of the described radio electronic devices. This book contains preface and six chapters. To my opinion, all materials are reliable and to the right degree are supported by necessary theoretical and experimental substantiation. Authors on the basis of numerical and physical experiments prove earnestly the opportunity of existence of the strange non-chaotic attractor in nonautonomous radio electronic circuits at single-frequency sinusoidal influence and on the basis of result generalization of much number of numerical and physical experiments authors offer and substantiate the feasibility for the wide class oscillator and relaxation generation system of the specific stochastization scenario, which did not meet earlier in the scientific publications on nonlinear dynamics. Theoretical analysis of modified logistic maps (MLM) and appropriate numerical and physical experiments allows authors to discover and investigate conditions of arising of the unknown phenomenon—intermittent synchronization. At last, some results of the book are checked by the functioning radio electronic devices. Scientific and practical importance of investigations

STATISTICAL MODELS OF THE CRITERION LEVELS OF SEMICONDUCTOR DEVICES ELECTROMAGNETIC KILL

A statistical model of the distribution of criterion energy levels of microwave pulse emissions, ensuring unrecoverable injury of input semiconductor devices in microwave receivers, is proposed. Methods for computing the probability of the functional kill of radioelectronic devices are developed; feasible functional kill distances for typical values of the microwave pulse transmitter energy potential, microwave path characteristics and the typical law of distribution of the criterion levels of semiconductor devices are evaluated.

Intelligent on-board TV system

For any type of vehicle, it is an acute problem to provide the driver (pilot) with the most complete information on the current traffic situation. As people think with visual images, radio electronic navigation, range-finders and other devices play an auxiliary role, and the existing optical means provide an unsatisfactory solution to this problem. Therefore, only on-board TV systems of circular scan are capable of solving this problem efficiently. The paper describes such a system providing automatically commutable reproduction of information, which is most relevant in the current traffic situation, on the screen.

Flicker-noise of electronic equipment: Sources, ways of reduction and application

Formula for calculating intrinsic noises of electronic elements in a wide frequencies range starting from f → 0 is presented here. Ways of reducing intrinsic noises in radio electronic devices in the low frequencies range and examples of using information meaning of flicker noise in practice are described.

Reliability of diagnostic methods based on low-frequency noise analysis

Various methods for separating an integrated circuit (IC) batch were considered using noise parameters for the purpose of determining their reliability. The existing methods for screening semiconductor products using low-frequency (LF) noise were tested on transistors, as well as both digital and analog ICs, and showed good results. Selection criteria for semiconductor products were determined based on the statistics of a representative sample; however, their reliability was not estimated. The calculation of the correlation coefficient of determined LF noise parameters and reference reliability testing results was taken as the basis of the determination of reliability of diagnostic methods. For the experiment, KR142EN5A ICs made by bipolar technology were selected, which represent three-pin stabilizers with a fixed output voltage from 5 V and are used in many radio-electronic devices.

Specification of interval tolerances by the mapping method

This study dealt with peculiarities of specifying the rated tolerances under conditions of the interval parameter distribution law and the variation of element properties during the operation of radioelectronic devices. This paper took into account nonlinear properties of the boundaries of the workability region, interval coefficients of external inputs and the most unfavorable combination of external factors at the mounting place of radio components. The boundary operating value or the width of the operating interval of the output function has been specified and the algorithms have been used for optimizing the interval tolerances.

Topological thermal compensation in a hybrid-film micro thermostat containing thermally stable substrate

The application of a minimal statistical error effect when controlling the temperature under topological thermal compensation of thermally sensitive electric radio components on the construction level in order to minimize the temperature inaccuracy of thermostatically controlled radio electronic devices in a hybrid-film thermostat with thermally stable substrate is considered. Numerical modeling of the two-dimensional non-stationary temperature fields of a thermally stable substrate taking into account real mechanisms of heat exchange for a proportional temperature controller is conducted.

Equivalent circuit of a composite acoustic resonator for microwave radioelectronic devices

On the basis of analyzing the expression for the input electric impedance of a composite microwave acoustic resonator, its equivalent electric circuit is constructed. It is shown that, for high-order harmonics, the difference between the antiresonance and resonance frequencies is determined not only by the electromechanical coupling coefficient, but also by the loss in the structure. The conditions under which this difference corresponds to the bandwidth of the equivalent parallel electric oscillatory circuit are formulated. Expressions for the resonance and antiresonance frequencies are derived. The procedures of determining the Q factor and the electromechanical coupling coefficient from the measured resonance and antiresonance frequencies of the structure are justified.

On the electro-corrosion of the elements of radio-electronic network

Certain peculiarities of the corrosion of elements of radio-electronic devices are studied. The mechanism of this phenomenon, kinetic factors, concomitant hazards, and conditions for its prevention are described.

A technique for estimating the probability of radiation-stimulated failures of integrated microcircuits in low-intensity radiation fields: Application to the Spektr-R spacecraft

In developing radio-electronic devices (RED) of spacecraft operating in the fields of ionizing radiation in space, one of the most important problems is the correct estimation of their radiation tolerance. The “weakest link” in the element base of onboard microelectronic devices under radiation effect is the integrated microcircuits (IMC), especially of large scale (LSI) and very large scale (VLSI) degree of integration. The main characteristic of IMC, which is taken into account when making decisions on using some particular type of IMC in the onboard RED, is the probability of non-failure operation (NFO) at the end of the spacecraft’s lifetime. It should be noted that, until now, the NFO has been calculated only from the reliability characteristics, disregarding the radiation effect. This paper presents the so-called “reliability” approach to determination of radiation tolerance of IMC, which allows one to estimate the probability of non-failure operation of various types of IMC with due account of radiation-stimulated dose failures. The described technique is applied to RED onboard the Spektr-R spacecraft to be launched in 2007.