DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)

20-23 Sept. 1999

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  • DIPED - 99. Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. Proceedings of 4th International Seminar/Workshop (IEEE Cat. No.99TH8402)

    Publication Year: 1999
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    Freely Available from IEEE
  • Contents

    Publication Year: 1999, Page(s):11 - 13
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    Freely Available from IEEE
  • Multidimensional inverse scattering problems

    Publication Year: 1999
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (54 KB)

    Summary form only given, as follows. An overview of the author's results is given. The inverse problems for obstacle, geophysical and potential scattering are considered. The basic method for proving uniqueness theorems in one- and multi-dimensional inverse problems is discussed and illustrated by numerous examples. The method is based on property C for pairs of differential operators. Property C ... View full abstract»

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  • Authors index

    Publication Year: 1999, Page(s):183 - 184
    IEEE is not the copyright holder of this material | PDF file iconPDF (49 KB)
    Freely Available from IEEE
  • Numerical solving of the synthesis problem of conical spiral antenna array with regard the mutual coupling

    Publication Year: 1999, Page(s):169 - 172
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    We consider the synthesis problem of an antenna array, which consists of thin wire radiators, through the given amplitude directivity pattern (DP) taking into account the mutual coupling of radiators and the vector character of the electromagnetic field. The regularization functional, which regards the mean-square deviations of components of the synthesis and the given magnitudes, and the limitati... View full abstract»

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  • Low-frequency resonator antenna converting linear polarized waves into circular

    Publication Year: 1999, Page(s):165 - 168
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (92 KB)

    Resonant transformers of the spatial and polarization structures of waves are known that employ semitransparent surfaces with anisotropic conductance. We consider the problem of excitation of a dielectric ball with the electric dipole located at its center and directed along the z-axis View full abstract»

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  • Applying the invariant approximations to the analysis of electromagnetic fields

    Publication Year: 1999, Page(s):158 - 162
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    This report deals with the elaboration of general algorithms for constructing discrete analogies of differential boundary-value electromagnetic problems by means of the finite-difference method and the theory of invariant function approximation. The obtained analogies are invariant according to the group of linear transformations of the Cartesian co-ordinate system, conservative and independent fr... View full abstract»

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  • Time-domain diffraction phenomena simulation for subsurface electromagnetic sounding

    Publication Year: 1999, Page(s):117 - 121
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    This paper presents a 2-D scalar numerical time-domain model with evident physical meaning for simulation of electromagnetic diffraction in the act of electromagnetic sounding implemented by ground-penetrating microwave radar. The data obtained as a result of the radar survey should be interpreted for detection, discrimination and location of hidden objects caused scattering phenomena. The propose... View full abstract»

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  • Rectangular waveguide-based phased arrays

    Publication Year: 1999, Page(s):42 - 44
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (88 KB)

    Performance characteristics of rectangular waveguide-based passive phased arrays of both reflection and tranmission types are analyzed. The reflection and the transmission factors of such structures are investigated in dependence on the problem geometry parameters. It has been shown that passive rectangular waveguide-based arrays can be employed to design radiation sources of hybrid reflector ante... View full abstract»

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  • Effective boundary conditions for a thin curved layer with tips

    Publication Year: 1999, Page(s):152 - 157
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    Effective impedance boundary conditions for acoustic and electromagnetic scattering in a thin unbounded curved layer with different surface impedances are considered. Explicit forms of the first-order approximate boundary conditions are derived for a two-dimensional case. The methodology of investigation is based on the method of matched asymptotic expansions with the thickness-to-diameter ratio a... View full abstract»

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  • Closed vanishing solutions of the nonlinear problems of the antenna synthesis

    Publication Year: 1999, Page(s):75 - 79
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (116 KB)

    The nonlinear integral equation describing solutions of the synthesis problem of a linear antenna is investigated. The solutions of this equation can vanish at [-1,1]. These solutions can be written in analytical form as a function with finite number of real and complex parameters. These parameters are calculated from a set of transcendental equations View full abstract»

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  • Application of FDTD to dispersive media

    Publication Year: 1999, Page(s):112 - 116
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    A finite difference time domain (FDTD) method in combination with the perfectly matched layer (PML) is used for dispersive media. The FDTD method is derived using the convolution relationship between the current density J and the electric field E. The high accuracy of the FDTD method is confirmed by computing the reflection and transmission coefficients for a one dimensional nonmagnetized plasma s... View full abstract»

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  • Problem of plane electromagnetic wave diffraction by multielement grating embedded in a half-space

    Publication Year: 1999, Page(s):132 - 135
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (108 KB)

    The problem of plane electromagnetic wave diffraction by multielement grating which is embedded in a half-space is considered. A system of singular integral equations is obtained by satisfying the necessary boundary conditions. A system of linear algebraic equation is obtained as a result of applying of special quadratures to the initial integral equations system View full abstract»

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  • Irregular dispersion and evolution equations of a quasi-homogeneous structure

    Publication Year: 1999, Page(s):37 - 41
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    For a laterally inhomogeneous dielectric layer, the dispersion equations and laws of the irregular dynamics of the spectra near the Morse critical point (MCP) are reported. This knowledge permits the square-law representation and furnishes the local equations of the time-space evolution of the wave-oscillation fields View full abstract»

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  • Diffraction field of uniformly excited elastic wave beams as the superposition of Gaussian beams

    Publication Year: 1999, Page(s):149 - 151
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (104 KB)

    On the basis of the parabolic approximation the spreading of uniformly excited (on the aperture) elastic wave beams is investigated. The method of presentation of the excitation as a superposition of Gaussian beams is used. The effect of the nearfield oscillation of the amplitude and phase of the elastic wave beams is accounted for View full abstract»

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  • Convergence of the consecutive approximation method of a solution of the nonlinear problems of the antennas synthesis

    Publication Year: 1999, Page(s):70 - 74
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    The weak convergence of a consecutive approximation method of a solution of the nonlinear equation is proved. The problem of searching of a pseudo-solution of the equations with a free phase is reduced to this equation. The operator of the equation is a superposition of the linear limited operator and nonlinear operator (modulus of a complex function). In this case the linear operator of the probl... View full abstract»

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  • Design of direct-coupled cavity microwave filters using full-mode electrodynamic analysis

    Publication Year: 1999, Page(s):109 - 111
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (148 KB)

    The full-mode electrodynamic analysis together with numerical experiments are used to design a passband microwave filter with the desired characteristics. The advantage of this approach compared with circuit element techniques is shown View full abstract»

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  • The system of wireless networks design

    Publication Year: 1999, Page(s):178 - 182
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    The system of wireless networks design is intended to search for the optimal location of the base stations on the ground or in a building is represented. The system enables one to create, edit and to delete objects (houses, if it is the plan of the district or walls, windows and doors, if it is the plan of a building) with a wide spectrum of parameters (dielectric constant, permeability and conduc... View full abstract»

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  • Rigorous analysis of axial symmetric wave diffraction by finite conical screen

    Publication Year: 1999, Page(s):129 - 131
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (84 KB)

    The analysis of electromagnetic wave scattering by finite metallic conical screens has received much attention in connection with prediction of the radar cross section of a target. This problem serves as a simple model of horn antennas and materials defects. We consider the scalar wave diffraction by a perfectly conducting finite cone as a basic problem for the given geometry and analyze the scatt... View full abstract»

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  • Analysis of rectangular-cell double-periodic magneto-dielectric gratings

    Publication Year: 1999, Page(s):49 - 52
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (108 KB)

    The problem of electromagnetic wave scattering by a double-periodic grating is solved by a new method based on the rigorous volume integro-differential equations. The Galerkin method is applied to reduce these volume integro-differential equations to a set of second-order differential ones with constant coefficients in functionals. Numerical solutions were obtained for the simplest double-periodic... View full abstract»

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  • Quasi-stationary approximation of electromagnetic energy spreading in a locally inhomogeneous conductive halfspace

    Publication Year: 1999, Page(s):84 - 87
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    The quasi-stationary approximation of the process of electromagnetic energy spreading in a halfspace is considered. Conductivity of the medium is a continuous function which is constant everywhere excepting for a finite domain of arbitrary shape. Using the fundamental solution of non-stationary diffusion equation, the projection method and the time marching scheme of the sole initial condition, we... View full abstract»

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  • Propagation of surface polaritons in finite superlattice with one shifted layer placed into the quantizing magnetic field

    Publication Year: 1999, Page(s):32 - 36
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    The paper deals with the theoretical investigation of surface polaritons (SP) in weakly disordered superlattice (WDSL), formed of the finite number of 2-dimensional electron systems (2DES). The weak disorderedness consists in the fact that one of the inner 2DES was shifted from the position of periodicity on some distance Δ. It is shown, that under the integer quantum Hall effect (IQHE) cond... View full abstract»

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  • Spectral parameters of resonance sound scattering from a circular cylindrical thin elastic shell

    Publication Year: 1999, Page(s):144 - 148
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The resonance scattering of plane sound waves from a circular cylindrical thin elastic shell with a vacuum inside is investigated. The R-matrix method for suppression of the background contribution in the total form-function and for extraction of the spectral information (positions and widths of the spectral lines) is used. The resonance characteristics of the multipole order m=2 are analyzed in d... View full abstract»

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  • Error estimation of characteristic numbers in the modified successive approximation method

    Publication Year: 1999, Page(s):65 - 69
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    To solve the eigenvalue problem with a completely continuous operator the modified successive approximation method is used. A method to estimate the linear part of the calculation errors is proposed. The questions of a priori estimation of the calculated characteristic numbers of the operator is discussed View full abstract»

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  • Singularities of scattered field

    Publication Year: 1999, Page(s):105 - 108
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    The role of scattered field singularities in the solution of EM scattering problems by the method of auxiliary sources is discussed. The example of a hyperbolic surface when the scattered field singularities are mainly located in a single point and the scattered field is represented by a single auxiliary source is presented View full abstract»

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