%0 Conference Paper %B Antennas and Propagation Society International Symposium, 2004. IEEE %D 2004 %T Computation of Green's function for finite-size photonic crystals by boundary element method %A Seydou,F. %A Ramahi,O. %A Duraiswami, Ramani %A Seppdnen,T. %K 2D %K boundary %K boundary-elements %K circular %K crystals; %K cylinders; %K electromagnetic %K element %K equation %K equations; %K expansions; %K finite-size %K function %K function; %K Green %K Green's %K integral %K method; %K methods; %K multipole %K photonic %K propagation; %K wave %X We have derived a new integral equation method for computing the Green's function for 2D electromagnetic wave propagation in a finite size photonic crystal. The method is also used for deriving the multipole expansions for the case of circular cylinders. This derivation is different from the ones in the literature. Our numerical results show an excellent agreement of the two algorithms. In the future we would like to expand the method to the numerical solution of the three-dimensional electromagnetic problem. %B Antennas and Propagation Society International Symposium, 2004. IEEE %V 4 %P 4320 - 4323 Vol.4 - 4320 - 4323 Vol.4 %8 2004/06// %G eng %R 10.1109/APS.2004.1330307 %0 Journal Article %J Magnetics, IEEE Transactions on %D 2004 %T Finite-element computation of nonlinear magnetic diffusion and its effects when coupled to electrical, mechanical, and hydraulic systems %A Brauer,J.R. %A Mayergoyz, Issak D %K actuator; %K actuators; %K analysis; %K axisymmetric %K B-H %K coupled %K currents; %K curves; %K cylinders; %K diffusion %K diffusion; %K eddy %K electrical %K electrohydraulic %K electrohydraulics; %K electromagnetic %K element %K equivalent %K finite %K finite-element %K flux; %K hydraulic %K magnetic %K mechanical %K methods; %K nonlinear %K resistor; %K responses; %K steel %K system; %K systems; %K times; %K transducers; %X Finite elements are used to compute eddy currents and magnetic diffusion times in steel cylinders with nonlinear B–H curves. Computations are made of diffusion times versus current in a typical axisymmetric magnetic actuator, showing good agreement with recently published approximate analytical formulas. The computed nonlinear diffusion times are then used to derive an equivalent resistor that is used in a model of an electrohydraulic system. The diffusion time causes delays in the coupled mechanical and hydraulic responses. %B Magnetics, IEEE Transactions on %V 40 %P 537 - 540 %8 2004/03// %@ 0018-9464 %G eng %N 2 %R 10.1109/TMAG.2004.824591 %0 Conference Paper %B Antennas and Propagation Society International Symposium, 2003. IEEE %D 2003 %T A 2D profile reconstruction in a multilayered waveguide structure %A Seydou,F. %A Duraiswami, Ramani %A Seppanen,T. %K (mathematics); %K 2D %K dual %K duality %K electromagnetic %K equations; %K inhomogeneous %K Maxwell %K media; %K method; %K multilayered %K multilayers; %K profile %K reconstruction; %K scattering; %K space %K structure; %K theory; %K wave %K waveguide %K waveguides; %X We discuss the problem of finding a profile or its location for a 2D scattering of electromagnetic waves with fixed frequencies in a waveguide multilayered domain. We use the dual space method (DSM) of Colton and Monk. Our goal is to extend our previous work of TE and TM cases to the more complicated case of a waveguide. We emphasize on the frequency range in the reconstruction. %B Antennas and Propagation Society International Symposium, 2003. IEEE %V 1 %P 531 - 534 vol.1 - 531 - 534 vol.1 %8 2003/06// %G eng %R 10.1109/APS.2003.1217513 %0 Conference Paper %B Antennas and Propagation Society International Symposium, 2003. IEEE %D 2003 %T A boundary element method for electromagnetic scattering by multiple cylinders %A Seydou,F. %A Duraiswami, Ramani %A Seppanen,T. %K algorithm; %K boundary %K boundary-elements %K cylinders; %K electromagnetic %K element %K equations; %K Fredholm %K integral %K method; %K methods; %K multiple %K Nystrom %K scattering; %K two-dimensional %K type %K wave %X An integral equation approach is derived for an electromagnetic scattering from M multiple cylinders. The problem is two-dimensional and the integral equation is solved using the Nystrom method. We give numerical examples that illustrate the algorithm. %B Antennas and Propagation Society International Symposium, 2003. IEEE %V 3 %P 516 - 519 vol.3 - 516 - 519 vol.3 %8 2003/06// %G eng %R 10.1109/APS.2003.1219899 %0 Conference Paper %B Antennas and Propagation Society International Symposium, 2003. IEEE %D 2003 %T Electromagnetic scattering from a multilayered cylindrical waveguide %A Seydou,F. %A Duraiswami, Ramani %A Seppanen,T. %K circular %K core; %K cylinder; %K cylindrical %K dielectric %K dielectric-loaded %K electromagnetic %K EM %K equations; %K matching; %K Maxwell %K mode %K multilayered %K scattering; %K theory; %K wave %K waveguide %K waveguide; %K waveguides; %X This paper is devoted to electromagnetic scattering from an N multilayered circular cylinder. We consider waveguides in the z direction; that is, we look for the solution of Maxwell equations along the z direction. We assume a dielectric core and derive a mode matching approach for solving the problem. A numerical result is presented that illustrates the algorithm. %B Antennas and Propagation Society International Symposium, 2003. IEEE %V 3 %P 332 - 335 vol.3 - 332 - 335 vol.3 %8 2003/06// %G eng %R 10.1109/APS.2003.1219855 %0 Conference Paper %B Antennas and Propagation Society International Symposium, 2003. IEEE %D 2003 %T Integral equation solution of electromagnetic scattering from a multilayered cylindrical waveguide %A Seydou,F. %A Duraiswami, Ramani %A Seppanen,T. %K approximation %K circular %K core; %K cylinder; %K cylindrical %K dielectric %K dielectric-loaded %K electromagnetic %K EM %K equations; %K integral %K Maxwell %K method; %K multilayered %K numerical %K Nystrom %K scattering; %K theory; %K wave %K waveguide %K waveguides; %X This paper is devoted to the electromagnetic scattering from an N multilayered cylinder. We consider waveguides in the z direction, that is: we look for the solution of Maxwell equations along the z direction. We assume a dielectric core and discuss the problem for the case of general domains. We use an integral equation approach to solve the problem and the Nystrom method for the numerical approximation. %B Antennas and Propagation Society International Symposium, 2003. IEEE %V 3 %P 524 - 527 vol.3 - 524 - 527 vol.3 %8 2003/06// %G eng %R 10.1109/APS.2003.1219901 %0 Conference Paper %B Antennas and Propagation Society International Symposium, 2003. IEEE %D 2003 %T A simplified Newton method for the inverse orthotropic problem %A Seydou,F. %A Seppanen,T. %A Duraiswami, Ramani %K algebra; %K electromagnetic %K inhomogeneous %K inverse %K matrix %K matrix; %K media; %K medium; %K method; %K Newton %K orthotropic %K problem; %K problems; %K scattering; %K wave %X We consider one of the most challenging inverse problems in electromagnetic scattering for inhomogeneous medium. We try to reconstruct the elements of a matrix from scattering data in an orthotropic medium. To solve the inverse problem, we implement a simplified Newton method and present some numerical results. %B Antennas and Propagation Society International Symposium, 2003. IEEE %V 1 %P 535 - 538 vol.1 - 535 - 538 vol.1 %8 2003/06// %G eng %R 10.1109/APS.2003.1217514 %0 Journal Article %J Magnetics, IEEE Transactions on %D 1993 %T RF scattering and radiation by using a decoupled Helmholtz equation approach %A D'Angelo,J. %A Mayergoyz, Issak D %K 3D %K analysis; %K approach; %K computer-efficient %K computing; %K decoupled %K domain; %K electrical %K electromagnetic %K element %K engineering %K equation %K finite %K finite-element %K formulation; %K Frequency %K frequency-domain %K Helmholtz %K method; %K Physics %K problems; %K propagation; %K radiation %K radiowave %K RF %K scattering; %K wave %X A novel finite-element formulation for the solution of 3-D RF scattering and radiation problems is presented. This formulation is based on the solution of a set of decoupled Helmholtz equations for the Cartesian components of the field vectors. This results in a robust, computer-efficient method that eliminates previous difficulties associated with `curl-curl' type partial differential equations. Although it is presented in the frequency domain, the method is easily extendible to the time domain %B Magnetics, IEEE Transactions on %V 29 %P 2040 - 2042 %8 1993/03// %@ 0018-9464 %G eng %N 2 %R 10.1109/20.250811