The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Ning Yan Zhu - One of the best experts on this subject based on the ideXlab platform.
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Numerical study of diffraction of a normally Incident Plane Wave at a hollow wedge with different impedance sheet faces by the method of parabolic equation
Radio Science, 2001Co-Authors: Ning Yan Zhu, Mikhail A. LyalinovAbstract:The problem of diffraction of a normally Incident Plane Wave at a hollow wedge formed by two different semi-infinite planar impedance sheets is studied numerically by using the parabolic equation (PE) method. It is assumed that either the electric or the magnetic field is parallel to the edge of the wedge. After having proved the uniqueness of the solution of the parabolic equation for passive wedge faces, the PE is solved via Crank-Nicolson finite difference scheme. A good agreement between the PE numerical results and available results for specific cases has been shown. In addition, the diffraction behavior dependent upon the parameters of the wedge faces has been displayed by several examples.
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diffraction of a skewly Incident Plane Wave by an anisotropic impedance wedge a class of exactly solvable cases
Wave Motion, 1999Co-Authors: Mikhail A. Lyalinov, Ning Yan ZhuAbstract:Abstract The Sommerfeld–Malyuzhinets’ technique and the special function χΦ, which is originally introduced in the study of Wave diffraction by a wedge located in a gyroelectric medium, have been used to find the exact solution for diffraction of a skewly Incident and arbitrarily polarized Plane Wave by wedges with an arbitrary opening angle and with a class of specific, but in general non-axial anisotropic face impedances. Just for these impedance faces suitable linear combinations of the field components parallel to the edge of the wedge are no longer completely related to each other on the wedge surfaces; an application of the Sommerfeld–Malyuzhinets’ technique to these boundary conditions then leads to inhomogeneous difference equations for the spectral functions; in terms of the χΦ function these functional equations are transformed to such simple forms that their closed-form exact solutions are given immediately. The uniform asymptotic expansion is then obtained via the method of saddle point. This solution coincides with exact solutions for tensor impedance wedges illuminated by a normally Incident Plane Wave and agrees very well with both analytical perturbation solution as well as numerical results of the method of parabolic equation for a skewly Incident Plane Wave. Typical diffraction behavior dependent on the skewness of the Incident Wave is also shown.
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Diffraction of a normally Incident Plane Wave at a wedge with identical tensor impedance faces
IEEE Transactions on Antennas and Propagation, 1999Co-Authors: Mikhail A. Lyalinov, Ning Yan ZhuAbstract:Diffraction of a normally Incident Plane Wave by a wedge with identical tensor impedance faces is studied and an exact solution is obtained by reducing the original problem to two decoupled and already solved ones. A uniform asymptotic solution then follows from the exact one and agrees excellently with numerical results due to the method of parabolic equation.
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Diffraction of a skewly Incident Plane Wave by an anisotropic impedance wedge – a class of exactly solvable cases
Wave Motion, 1999Co-Authors: Mikhail A. Lyalinov, Ning Yan ZhuAbstract:Abstract The Sommerfeld–Malyuzhinets’ technique and the special function χΦ, which is originally introduced in the study of Wave diffraction by a wedge located in a gyroelectric medium, have been used to find the exact solution for diffraction of a skewly Incident and arbitrarily polarized Plane Wave by wedges with an arbitrary opening angle and with a class of specific, but in general non-axial anisotropic face impedances. Just for these impedance faces suitable linear combinations of the field components parallel to the edge of the wedge are no longer completely related to each other on the wedge surfaces; an application of the Sommerfeld–Malyuzhinets’ technique to these boundary conditions then leads to inhomogeneous difference equations for the spectral functions; in terms of the χΦ function these functional equations are transformed to such simple forms that their closed-form exact solutions are given immediately. The uniform asymptotic expansion is then obtained via the method of saddle point. This solution coincides with exact solutions for tensor impedance wedges illuminated by a normally Incident Plane Wave and agrees very well with both analytical perturbation solution as well as numerical results of the method of parabolic equation for a skewly Incident Plane Wave. Typical diffraction behavior dependent on the skewness of the Incident Wave is also shown.
Mikhail A. Lyalinov - One of the best experts on this subject based on the ideXlab platform.
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Numerical study of diffraction of a normally Incident Plane Wave at a hollow wedge with different impedance sheet faces by the method of parabolic equation
Radio Science, 2001Co-Authors: Ning Yan Zhu, Mikhail A. LyalinovAbstract:The problem of diffraction of a normally Incident Plane Wave at a hollow wedge formed by two different semi-infinite planar impedance sheets is studied numerically by using the parabolic equation (PE) method. It is assumed that either the electric or the magnetic field is parallel to the edge of the wedge. After having proved the uniqueness of the solution of the parabolic equation for passive wedge faces, the PE is solved via Crank-Nicolson finite difference scheme. A good agreement between the PE numerical results and available results for specific cases has been shown. In addition, the diffraction behavior dependent upon the parameters of the wedge faces has been displayed by several examples.
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diffraction of a skewly Incident Plane Wave by an anisotropic impedance wedge a class of exactly solvable cases
Wave Motion, 1999Co-Authors: Mikhail A. Lyalinov, Ning Yan ZhuAbstract:Abstract The Sommerfeld–Malyuzhinets’ technique and the special function χΦ, which is originally introduced in the study of Wave diffraction by a wedge located in a gyroelectric medium, have been used to find the exact solution for diffraction of a skewly Incident and arbitrarily polarized Plane Wave by wedges with an arbitrary opening angle and with a class of specific, but in general non-axial anisotropic face impedances. Just for these impedance faces suitable linear combinations of the field components parallel to the edge of the wedge are no longer completely related to each other on the wedge surfaces; an application of the Sommerfeld–Malyuzhinets’ technique to these boundary conditions then leads to inhomogeneous difference equations for the spectral functions; in terms of the χΦ function these functional equations are transformed to such simple forms that their closed-form exact solutions are given immediately. The uniform asymptotic expansion is then obtained via the method of saddle point. This solution coincides with exact solutions for tensor impedance wedges illuminated by a normally Incident Plane Wave and agrees very well with both analytical perturbation solution as well as numerical results of the method of parabolic equation for a skewly Incident Plane Wave. Typical diffraction behavior dependent on the skewness of the Incident Wave is also shown.
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Diffraction of a normally Incident Plane Wave at a wedge with identical tensor impedance faces
IEEE Transactions on Antennas and Propagation, 1999Co-Authors: Mikhail A. Lyalinov, Ning Yan ZhuAbstract:Diffraction of a normally Incident Plane Wave by a wedge with identical tensor impedance faces is studied and an exact solution is obtained by reducing the original problem to two decoupled and already solved ones. A uniform asymptotic solution then follows from the exact one and agrees excellently with numerical results due to the method of parabolic equation.
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Diffraction of a skewly Incident Plane Wave by an anisotropic impedance wedge – a class of exactly solvable cases
Wave Motion, 1999Co-Authors: Mikhail A. Lyalinov, Ning Yan ZhuAbstract:Abstract The Sommerfeld–Malyuzhinets’ technique and the special function χΦ, which is originally introduced in the study of Wave diffraction by a wedge located in a gyroelectric medium, have been used to find the exact solution for diffraction of a skewly Incident and arbitrarily polarized Plane Wave by wedges with an arbitrary opening angle and with a class of specific, but in general non-axial anisotropic face impedances. Just for these impedance faces suitable linear combinations of the field components parallel to the edge of the wedge are no longer completely related to each other on the wedge surfaces; an application of the Sommerfeld–Malyuzhinets’ technique to these boundary conditions then leads to inhomogeneous difference equations for the spectral functions; in terms of the χΦ function these functional equations are transformed to such simple forms that their closed-form exact solutions are given immediately. The uniform asymptotic expansion is then obtained via the method of saddle point. This solution coincides with exact solutions for tensor impedance wedges illuminated by a normally Incident Plane Wave and agrees very well with both analytical perturbation solution as well as numerical results of the method of parabolic equation for a skewly Incident Plane Wave. Typical diffraction behavior dependent on the skewness of the Incident Wave is also shown.
R.a. Shore - One of the best experts on this subject based on the ideXlab platform.
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The currents on a cylinder illuminated by a general obliquely-Incident Plane Wave
IEEE Transactions on Antennas and Propagation, 1995Co-Authors: T.b. Hansen, R.a. ShoreAbstract:A relation is presented that determines the total current induced by a general Plane Wave obliquely Incident or a perfectly electrically conducting cylinder of arbitrary cross section from the total current induced by a normally Incident Plane Wave. Remarkably, this same relation ran also be used to determine the physical optics (PO) and nonuniform (NU) currents for oblique incidence directly from the PO and NU currents, respectively, for normal incidence.
S.t. Peng - One of the best experts on this subject based on the ideXlab platform.
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Distribution of current induced on metal-strip gratings by Plane Wave
IEEE Transactions on Microwave Theory and Techniques, 1998Co-Authors: C.m. Shiao, S.t. PengAbstract:In this paper, we present a rigorous analysis of current distribution induced on a metal-strip grating by an Incident Plane Wave. The metal strips of the grating are characterized by a complex permittivity, with a large imaginary part to account for their finite conductivity. Such a scattering problem is formulated by the mode-matching method to determine the scattered fields everywhere, so that the volume distribution of current within a metal strip can be explicitly obtained. Numerical results are given to illustrate the effects of the dielectric constant of the surrounding media, as well as the Incident angle and polarization on the current distribution induced by an Incident Plane Wave. The air and metal modes form the basis for physical explanations of the numerical results obtained.
Akhlesh Lakhtakia - One of the best experts on this subject based on the ideXlab platform.
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Light scattering by magnetoelectrically gyrotropic sphere with unit relative permittivity and relative permeability.
Journal of the Optical Society of America. A Optics image science and vision, 2014Co-Authors: A. D. Ulfat Jafri, Akhlesh LakhtakiaAbstract:An exact transition matrix was formulated for electromagnetic scattering by a sphere made of a magnetoelectrically gyrotropic material with unit relative permittivity and relative permeability. The total scattering and forward scattering efficiencies are lower when the magnetoelectric gyrotropy vector of the sphere is either coparallel or antiparallel to the electric field or magnetic field of an Incident Plane Wave than when the magnetoelectric gyrotropy vector is parallel to the propagation vector of the Incident Plane Wave. Backscattering is absent when the propagation vector is either coparallel or antiparallel to the magnetoelectric gyrotropy vector.
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Reflection of an obliquely Incident Plane Wave by a half space filled by a helicoidal bianisotropic medium
Physics Letters A, 2010Co-Authors: Akhlesh LakhtakiaAbstract:The one-point boundary-value problem of reflection of an obliquely Incident Plane Wave by a half space occupied by a linear helicoidal bianisotropic medium (HBM) was solved. The solution procedure relies on the HBM being at least slightly dissipative, and also yields a modal representation for the fields therein. The solution procedure should also apply for a half space containing any linear material that varies periodically in the normal direction.
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Rayleigh scattering by an infinitely long tube with a helical permittivity dyadic
Journal of Physics D: Applied Physics, 1998Co-Authors: Akhlesh Lakhtakia, Werner S. WeiglhoferAbstract:Rayleigh scattering by an infinitely long, circular tube with a helical permittivity dyadic is analysed using an integral equation formalism. When the tube is irradiated by either a TE or a TM polarized Plane Wave, the scattered field is copolarized. For other types of Incident Plane Waves, the vibration ellipse of the far-zone scattered field can differ from that of the Incident Plane Wave.
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On the scattering of an obliquely Incident Plane Wave by a biisotropic cylinder
International Journal of Infrared and Millimeter Waves, 1992Co-Authors: Asoke K. Bhattacharyya, Akhlesh LakhtakiaAbstract:Scattering of an obliquely Incident electromagnetic Plane Wave by an infinitely long, homogeneous, biisotropic cylinder is addressed. The ambient host medium considered is isotropic, homogeneous and dielectric-magnetic. It is observed that the constitutive coupling of the electric and the magnetic fields in the biisotropic material causes the cross-polarization component of the scattered field not to vanish even for the normal incidence case.
