THE TECHNIQUE OF CALCULATION THE PARAMETERS OF THE ELECTROMAGNETIC THE FIELDS SCATTERED BY THE BODY WITH COMPLEX FORM IN THE NEAR ZONE
The paper is based on the methodology that uses the representation of an object of complex shape as a set of facets, we investigate the characteristics of scattered by this object in its near zone. It is shown how, using the calculated data to explore the effect of the spatial configuration of the field on the accuracy of measurement of angular coordinates of the object. The calculated dependence of the relative field amplitude of the object and the plate from the corner for the near zone to the far zone. The graphical analysis of the dependencies shows that in addition to monotonic attenuation length fields exist oscillating damped oscillations. It is believed that the antenna is moved around the object at random are averaged over all viewing angles characteristics of the scattered field. After calculating the parameters of the distribution law of a random variable from section to section, we can conclude about how changing the process in time. The analysis demonstrates that when we move from the far zone to the near, there is a shift of peak values of amplitudes and is an extension of the main lobe of the secondary radiation. The histograms of the distributions of amplitudes and phases of a complex object, after analysis it was found that the distribution of instantaneous values of the amplitudes of the scattered field by the object is described by Rayleigh. If we consider the distribution of the instantaneous phase of the scattered field, the shape of the histogram is close in form to the histogram of a uniform law. The analysis of the results allows to assert that the regularities of the distribution of values of amplitudes and phases of the scattered field related to the far and near zones will be the same.
Keywords: complex object, electromagnetic wave, near zone, scattering, diffraction.
THE SIMULATION OF THE SCATTERING OF PULSES OF RADIO WAVES ON HOLLOW STRUCTURE
V. V. Kostyuchenko, N.A.Ankina
On the basis of the method, allowing a numerical solution of the full system of Maxwell’s equations, carried out the study of the scattering of a pulse with nanosecond duration of the three-dimensional hollow structure of rectangular cross-section. The calculation of the shapes of the reflected signals for different ratios between the spatial lengths of the pulses and the size of the diffraction structure. It was demonstrated that the value of the effective area of the scattering hollow structures with sizes close to the spatial length of the radar pulse, will be about the same as in the case of scattering long (monochromatic) pulses.
Keywords: momentum, scattering, hollow structure, Maxwell equations, finite difference method in the time domain.
INVESTIGATION OF THE ABSORPTION OF ELEKTROMAGNITNOGO FIELD OF BIOLOGICAL MATERIAL ON THE EXAMPLE OF THE 2-DIMENSIONAL CASE
In this paper the study of new schematic models, which can be useful in the evaluation of induced fields in biological objects is given. The case of incident plane electromagnetic wave is considering. for the 2-dimensional case. In these models the description of induced fields in a lossy medium is given, by applying theory of transmission lines. Voltages and currents in circuits models simulate the electrical and magnetic field environments. The solution involves the presentation of equivalent conductance and current sources of polarization in the medium. Such currents are treated as sources of excitation in the contours of the patterns which dictate the condition of the induced field.
Keywords: propagation of electromagnetic waves, biological tissues, scattering, polarization.
THE PROPERTIES OF METHODS OF ESTIMATION OF SCATTERING CHARACTERISTICS OF ELECTROMAGNETIC WAVES
O.A. Boluchevskaya, O.N.Gorbenko
The paper is devoted to modern methods of calculating the characteristics of electro-magnetic waves. The peculiarities of the solutions of the tasks to different frequency areas are pointed out.
Keywords: scattering, waves, method.
THE PROPOSALS FOR MODIFICATION OF ALGORITHM FOR THE ANALYSIS OF THE SCATTERING CHARACTERISTICS OF OBJECTS
The paper discusses the elements of the algorithm of processing the data when analyz-ing the characteristics of the scattering objects of complex shape.
Keywords: simulation, algorithm, scattering, object.
THE APPLICATION OF SIMPLIFIED APPROACHES IN THE ANALYSIS OF THE ELECTRODYNAMIC CHARACTERISTICS OF OBJECTS
The paper considers possibilities of use of approximate methods in the evaluation of characteristics of complex objects. It was noted that when using research Institute of these approaches is significantly reduced the time required.
Keywords: diffraction, scattering, the algorithm, object.
THE METHODS FOR SOLVING PROBLEMS OF SCATTERING OF ELECTROMAGNETIC WAVES ON A HOLLOW STRUCTURES
The methods that can be used for the estimation of characteristics is the scattering of electromagnetic waves on a hollow structures are discussed. Their features are indicated.
Keywords: electromagnetic wave, hollow structure, algorithm, scattering.
THE PROBLEMS OF CONTROL LEVEL OF SCATTERED ELECTROMAGNETIC FIELD
The paper discusses the problem of scattering of electromagnetic waves on a hollow structures. The proposals are given to the management of scattered electromagnetic field due to selection of the size of the object.
Keywords: hollow structure, integral equation, scattering, electromagnetic wave.
ABOUT THE USING OF INTEGRAL EQUATIONS IN THE SOLUTION OF ELECTRODYNAMIC PROBLEMS
The analysis of characteristics of integral equations is carried out. The possible methods of their solution. the methods is considered. The possibility of using integral equations is indicated in the solution of electrodynamic problems.
Keywords: integral equations, electromagnetic wave, scattering.
THE POSSIBILITIES FOR INCREASING THE EFFICIENCY OF SOLVING PROBLEMS WHEN DESIGNING WIRELESS NETWORKS
The paper examines approaches for optimizing the solution of the problems for wireless networks. The analysis of methods of optimization, indicated their advantages and disadvantages, the problems are listed in which these optimization methods can be used.
Keywords: wireless network, optimization, method, diffraction, scattering.