Vol 17, No 3 (2014)
- Year: 2014
- Articles: 12
- URL: https://journals.ssau.ru/pwp/issue/view/388
Articles
6-8
Singular integral representation of the electromagnetic field as a means to correct solutions antenna problems
Abstract
The article is devoted to the (singular) integral representation of the electromagnetic field ((S)IP EMF). The questions relating to the place IP EMF in electrodynamics, as well as their use for constructing a rigorous self-consistent theory of antennas, which is by far the most part is a theory of the far zone. The definition of ill-posed problem of antenna theory. Given IP EMF for the most common classes of radiating structures. The results of numerical modeling are presented.
9-23
On boundary value problems of electrodynamics without the Lorentz gauge
Abstract
The possibilities of direct variational methods without imposing conditions on the field the Lorentz gauge. Offered standalone expansion of the components of the electromagnetic field and the application of the Galerkin procedure directly to Maxwell’s equations.
24-28
Correct electrodynamic analysis chiral elements and metamaterials based on the integral representations electromagnetic field
Abstract
The foundations of the correct electrodynamic analysis of geometrically and physically chiral elements and metamaterials. As the main tool is proposed to use the integral representation of the electromagnetic field stranded wire structure. The mechanism accounting interelemental interaction realized through a generalized procedure of the Gauss - Seidel method. Results of numerical simulation for some chiral elements and metastructures.
29-39
Convergence of Volterra series applied to analysis of nonlinear dynamic circuits
Abstract
The behavior of the Volterra model for nonlinear dynamic circuits is explored. It is shown that the critical signal levels for the convergence of the Volterra series - these are the points of explicit or implicit transition of nonlinear model from one state to another. This transition is accompanied by strong increasing recursive nonlinear interactions due to feedback loops and appearing the branch points for the solutions of nonlinear equations in the complex domain. That ultimately leads to the destruction of the concept based on separation of the nonlinearities in accordance to their levels. The Volterra series with their weak recursive stability lose their ability to describe the intensive re-interaction of spectral components. Because of this, the Volterra series begin to diverge.
40-45
Mean square error of direction finding of sources of super-broadband signals at spatial filtering of hindrances
Abstract
With use of estimates of maximum likelihood of time of arrival and the characteristics of transfer reception of non-harmonic wave processes the mean square error of determination of angular coordinates of super-broadband sources of a radio emission in spatially distributed systems with linear antenna lattices is investigated. The analysis of accuracy of a direction-finding of radiators is carried out at a spatial filtration of pulse and Gaussian hindrances by formation of zero of partial directional patterns with minimization of losses of power coefficients of the directed action of arrays.
46-53
Selection problems of optical fiber for transport telecommunication new generation networks
Abstract
The paper presents an analysis of the main trends in the development of transport networks in general, and data transmission technologies in particular. The requirements for fiber-optic transmission lines of transport networks of new generation are formulated. Options and choices of the optical fibers of these lines are considered. In particular, we considered the data transmission on super channel of lines with standard single-mode fibers, few-mode fiber, in a few-mode regime multimode fiber and multicore fiber. The comparison of the channel characteristics for these fibers is executed. In particular, the application with multimode fiber and multicore fiber technologies spatial division multiplexing and MIMO was considered. Presents forecasts for choosing optical fibers for the next generation transport networks.
54-64
Bragg coaxial microwave structure in the sensor system
Abstract
The paper discusses the Bragg microwave structures on the coaxial cable that are based on optical technology transfer by analogy with fiber Bragg gratings. The variants of the use of such coaxial Bragg microwave structures in sensor applications, in particular discusses the creation of mechanical strain meters, the dielectric parameters of liquids and the level of liquid products.
65-70
Microwave device there is designing on base of the theorem about cut-in alike reactive symmetrical quadrupoles
Abstract
The microwave devices structured syntheses with use shunting quadrupoles is considered in given to article. The Theorem about cascade cut-in reactive symmetrical quadrupoles happens to here. The examples different microwave devices are brought in given to article.
71-75
Mathematical simulation for the main stages of mechanical treatment technological process for VHF and EHF devices ceramic and ferrite component parts
Abstract
There are presented mathematical models of the main stages for producing ceramic and ferrite component parts of VHF and EHF devices by treating mechanically plane and cylindrical blanks. The models of rough and fine polishing ceramic and ferrite component parts external surfaces by abrasive and diamond wheels as well as drilling holes by diamond drill and ultrasonic methods.
76-81
Problems and ways of solution of unitization and import substitution in modern distributed power supply system for electronic devices
Abstract
The management concept for unitized architectures, modules and devices, hardware boxes needed for marine distributed power system (including radio navigation, radiolocation, radio link, communication, hydro acoustics, control systems and so on) building is proposed based on analysis and requirements arrangement imposed to unitized power systems for electronic equipments, well-known technology analysis.
82-89
Investigation of the frequency ranges for pacemakers of irradiation phenomena in the light effects on the retina of the human eye by analyzing the results of the application of fractal measures to EEG signals
Abstract
This paper examines the impact of the choice of the analyzed frequency bands to increase the probability of a correct differentiation states the level of activity of the brain under the influence of various light intensity as a result of application of fractal techniques to the analysis of deterministic chaos electroencephalogram. Provides a method for estimating the probability of correctly detecting the presence effect irradiation impacts during use of fractal methods to the analysis of electroencephalograms, and ways to increase this probability. Numerical estimates are increasing the likelihood by applying the results of the author’s procedures.
90-95
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