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.
Motivation of the paper in big frame is to determine some anisotropic properties under surface of the earth like tunnels, empty areas or dielectric pipelines. It is well known, that for some frequencies of the electromagnetic waves the earth is pretty transparent and field penetrates into the ground. Reflected outgoing wave must contain information about the structure underground surface. This article...
The Method of Auxiliary Sources (MAS) is used to study the torus form concave-convex hollow metallic voluminous resonator. Such resonators have wide application in high frequency radio-electronics. Using the proposed method it is possible to find ail eigen frequencies of the voluminous resonators and study the structure of the eigen resonant fields.
The aim of this research is to investigate the influence of EM radiation, emitted by base station antenna, on a human homogenous model located in a car and study possible resonant fields inside it considering ground existence. The standard frequencies: 450, 900, 1800 [MHz] are selected for numerical experiments. The problems are studied using a user friendly program package base on the Method of Auxiliary...
In the previous work [1] there was shown the efficient application of the Method of auxiliary sources (MAS) for the problems of Eigen frequencies and electromagnetic resonator's Eigen Fields. The calculations for numerical results were conducted for 2D case, when the resonator is bounded by the cylindrical surface. There was shown the efficiency of the proposed method in comparison to the traditional...
This paper presents creation of the optimal size directive gain antenna which radiates a desired predefined pattern. Theory of this study based on the Method of the Auxiliary Sources (MAS) was published in previous paper and briefly reminding the basic ideas of the approach results of the experimental measurements on created real prototype antenna are discussed. In practice during the antenna syntheses...
In this article there is considered a new approach for Active Sources Localization (ASL) based on the measured or given data of the field's distribution on some surface. The task belongs to the solution of the inverse scattering problem based on the Method of Auxiliary Sources (MAS). Inherently, proposed approach is using fundamental property of the scattered field — the uniqueness of the wave field's...
This paper presents the utilization of the Method of Auxiliary Sources (MAS) to localize active source positions of radiation by a desired predefined pattern or measured near-field distribution. The active sources position is based on the uniqueness of the wave field's analytical continuation along its propagation and, by means of the converging and diverging wave's function, localizes the positions...
This paper presents the human exposure simulation study considering the presence of a hand, holding the handset, and some resonant effects due to the presence of the room walls. The motivation for this research is the necessity to consider influence of the hand on the field in the near zone for proper understanding of the exposure nature. It is known that for some frequencies rooms in the ferroconcrete...
The method of auxiliary sources is used in the spectral problem for 2D and 3D electromagnetic resonators. Instead of traditional solution methods, based on the search of nonzero roots of homogenous equation system, in this work the problem is reduced to the solution of the nonhomogeneous system which simplifies the solution of the stated problem. Considering the diffraction problem on concrete objects...
The Method of Auxiliary Sources (MAS) is efficiently used in the synthesis problem of antenna with the given far field pattern, by means of the radiated field's fundamental singularities determination. The paper is the continuation and the generalization to the 3D cases our previous publications. As it is known, the same directivity pattern, at the given frequency, could be obtained with the different...
A mobile communication system base station's radiation interaction with a human model inside of a building is studied in this article. The inner field and its amplification by the building as a resonator are studied. The problem is solved using the Method of Auxiliary Sources with a program package, created for numerical experiments. Several cases of the human location and building wall's transparency...
Plane EM wave diffraction phenomenon for the layered structure of the infinite 2D periodic lattices using the Method of Auxiliary Sources (MAS) is studied. There are considered the cases when this structure in embedded in the free media and also inside of the dielectric layer. The lattice elements represent open and closed conductors with the small electric radius, which have the resonant properties...
The motivation of this paper is to study the influence of the background EM field (at wireless connection frequencies) on the human body. We have investigated the EM field's distribution in the closed, semi-open and open geometries with the presence of the human model. We studied the EM wave field's nature for some big scenarios considering interaction with an object like a human body. Besides, we...
The method of auxiliary sources is applied to solve problems of electromagnetic wave diffraction by finite 2D and 3D periodic metal-dielectric structures. The goal of this work is to get multiple resonance effects in such structures when these structures have complex materials properties. On the basis of the structures under study, 3D lattice with negative refractive index is modeled. The possibilities...
By means of the Method of Auxiliary sources (MAS)the diffraction problem of the plane electromagnetic wave on the infinite system, which consists of the planar finite width dielectric layer and the planar 2-D periodic lattice is solved. Results of the several numerical experiments are presented.
The study of the electromagnetic wave diffraction on the thin, perfectly conductor surfaces using the Method of Auxiliary Sources (MAS) is presented in this paper. Plane, corrugated and rounded plate cases are considered. Details of numerical realizations are discussed. Comparison of the numerical results obtained using MAS and Method of Moments (MOM) are given, from which the advantage of the MAS...
The electromagnetic (EM) field's diffraction problem on the finite periodic lattice embedded in the usual dielectric is considered. The element of the lattice represents the conductor wire with small electrical radius and with shape of the Cassini oval. Such structures have interesting resonant properties in wide frequency range. The Method of Auxiliary Sources (MAS) is used to solve this problem...
The new vision on the Rayleigh hypothesis is discussed based on several new results of computer simulations. Possible or actual singularities in the analytic continuation of the scattering problem solutions for the two and tree dimensional Helmholtz equation are studied in order to investigate the Rayleigh hypothesis validity. The procedure uses computer simulations for the solution particular problems,...
The motivation for this article is to investigate properties of finite periodical structures with resonant elements immersed in a conventional dielectric. It is well known that such combination could have the properties of complex material. Particularly our goal is to apply this kind of structure to design an antenna with a circularly polarized irradiated field and with a flat pattern in a chosen...
In 2010 at the DIPED International Seminar/Workshop there was presented the theoretical part for the diffraction problem of the plane wave on the 2D periodical infinite lattice located in the free space [1]. The lattice element represented the conducting wire with the resonant properties
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.