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Dissertations / Theses on the topic 'Scattering of electromagnetic waves'

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1

Altintas, Ayhan. "Electromagnetic Scattering from a Class of Open-Ended Waveguide Discontinuities." Connect to resource, 1986. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1208793684.

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2

Osman, Junaidah. "Scattering and nonlinear interaction of electromagnetic waves." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315373.

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3

DeWitt, Brian Thomas. "Analysis and measurement of electromagnetic scattering by pyrimidal and wedge absorbers /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487265143144813.

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4

Hatziioannou, John. "The scattering of electromagnetic waves by rough surfaces." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627099.

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5

Xie, Zhongqiang. "Fourth-order finite difference methods for the time-domain Maxwell equations with applications to scattering by rough surfaces and interfaces." Thesis, Coventry University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369842.

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6

WILLIAMS, JEFFERY THOMAS. "ELECTROMAGNETIC SCATTERING FROM AND NATURAL RESONANCES OF THE CIRCULAR STRIP." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184194.

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The formulation and calculation of the electromagnetic fields scattered from, and the natural resonances of, a thin, perfectly conducting circular strip mounted on a perfectly conducting ground plane is presented. The fields are excited by an axial electric dipole, oriented normal to the surface of the ground plane. An electric field integral equation is formulated in terms of the induced surface current and solved in closed form in the quasi-static limit as an expansion of Chebyshev polynomials. In addition, the integral equation is solved for the general case by the method of moments (MOM).
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7

Sundberg, Garth. "Numerical Modeling of Electromagnetic Scattering in Explosive Granular Media." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/865.

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Terahertz (THz) reflection and transmission spectroscopy is a promising new field with applications in imaging and illicit material detection. One particularly useful application is for the detection of improvised explosive devices (IEDs) which is a favorite weapon of global terrorists. Explosive materials have been shown to have a unique spectral signature in the THz band which can be used to identify the explosives. However, the initial measurements performed on the explosive samples do not account for the modulation of the spectral features by random scattering that will be prevalent with a
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8

WEYKER, ROBERT RICHARD. "RESONANCE AND ASYMPTOTIC SERIES BASED IDENTIFICATION OF AN ACOUSTICALLY RIGID SPHERE (SINGULARITY EXPANSION METHOD)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183850.

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Identification of the resonances and the local determination of the radius of curvature of an acoustically rigid sphere from simulated transient input-output data is presented. The scattering from the sphere is formulated using three techniques: the classic Mie-Lorenz series, the singularity expansion method (SEM), and the asymptotic series approximation. The Mie-Lorenz series is used to provide synthetic data. The SEM and the asymptotic series are used to develop two parametric inverse models. The scattered velocity potential is separated into three components: the reflection, the first creep
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9

Oates, John H. (John Harvey). "Propagation and scattering of electromagnetic waves in complex environments." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/34062.

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10

Pao, Hsueh-yuan 1954. "ELECTROMAGNETIC SCATTERING FROM A BRANCH LINE IN A PARALLEL PLATE WAVEGUIDE (METHOD OF MOMENTS, TRANSIENT FIELDS)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/276837.

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11

Cotuk, Umit. "Scattering from multi-layered metamaterials using wave matrices." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FCotuk.pdf.

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12

Ma, Qinglin. "Study of scattering and depolarizaiton of an electromagnetic wave incident upon a slab of random medium using radiative transfer theory /." Thesis, Connect to this title online; UW restricted, 1989. http://hdl.handle.net/1773/5843.

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13

Sengers, Lynn H. Ailes. "Particle shape corrections to Twersky's formalism for multiple scattering in a random particulate medium." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-06102009-063037/.

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14

Whittall, Kenneth Patrick. "Exploring magnetotelluric nonuniqueness using inverse scattering methods." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27563.

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I present two algorithms which solve the one-dimensional magnetotelluric (MT) problem of finding the electrical conductivity σ(z) as a function of depth in the earth. Together, these algorithms restrict and explore the nonuniqueness of the nonlinear MT inverse problem. They accept constraints which limit the space of acceptable conductivity models and they construct diverse classes of σ(z) in order to explore this space. To avoid pitfalls during interpretation, it is essential to investigate the extent of the nonuniqueness permitted by the MT data. Algorithm 1 is a two-stage process based on
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15

Fozard, John Andrew. "Diffraction and scattering of high frequency waves." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433239.

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This thesis examines certain aspects of diffraction and scattering of high frequency waves, utilising and extending upon the Geometrical Theory of Diffraction (GTD). The first problem considered is that of scattering of electromagnetic plane waves by a perfectly conducting thin body, of aspect ratio O(k^1/2), where k is the dimensionless wavenumber. The edges of such a body have a radius of curvature which is comparable to the wavelength of the incident field, which lies inbetween the sharp and blunt cases traditionally treated by the GTD. The local problem of scattering by such an edge is tha
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16

Côté, Alain C. "Density fluctuation measurements with laser scattering." Thesis, University of Oxford, 1989. http://ora.ox.ac.uk/objects/uuid:2580d8c1-32f7-40c6-afe1-14ebde9641f3.

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-2 power law. The average phase velocities are around 4.5 km/sec and are slightly larger than the electron diamagnetic drift velocity. The waves are tentatively identified with the electron drift mode. Coherent signals due to long wavelength MHD modes are detected. Results from a Langmuir probe corroborate most of these data.
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17

Xiao, Jingni. "Theoretical advances on scattering theory, fractional operators and their inverse problems." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/513.

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Inverse problems arise in numerous fields of science and engineering where one tries to find out the desired information of an unknown object or the cause of an observed effect. They are of fundamental importance in many areas including radar and sonar applications, nondestructive testing, image processing, medical imaging, remote sensing, geophysics and astronomy among others. This study is concerned with three issues in scattering theory, fractional operators, as well as some of their inverse problems. The first topic is scattering problems for electromagnetic waves governed by Maxwell equat
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18

Ailes-Sengers, Lynn H. "Pulse broadening, polarimetric and angular memory effects of wave scattering from very rough surfaces /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/5856.

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19

Myung, Noh Hoon. "A high frequency analysis of electromagnetic plane wave scattering by perfectly-conducting semi-infinite parallel plate and rectangular waveguides with absorber coated inner walls /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487267546980859.

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20

Doyle, Timothy Edwin. "Computational Scattering Models for Elastic and Electromagnetic Waves in Particulate Media." DigitalCommons@USU, 2004. https://digitalcommons.usu.edu/etd/1695.

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Numerical models were developed to simulate the propagation of elastic and electromagnetic waves in an arbitrary, dense dispersion of spherical particles. The scattering interactions were modeled with vector multipole fields using pure-orbital vector spherical harmonics, and solved using the full vector form of the boundary conditions. Multiple scattering was simulated by translating the scattered wave fields from one particle to another with the use of translational addition theorems, summing the multiple-scattering contributions, and recalculating the scattering in an iterative fashion to a
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21

Chen, Yongpin, and 陈涌频. "Surface integral equation method for analyzing electromagnetic scattering in layered medium." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B4775283X.

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Surface integral equation (SIE) method with the kernel of layered medium Green's function (LMGF) is investigated in details from several fundamental aspects. A novel implementation of discrete complex image method (DCIM) is developed to accelerate the evaluation of Sommerfeld integrals and especially improve the far field accuracy of the conventional one. To achieve a broadband simulation of thin layered structure such as microstrip antennas, the mixed-form thin-stratified medium fast-multipole algorithm (MF-TSM-FMA) is developed by applying contour deformation and combining the multip
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22

Lin, Chien-Min. "Efficiently computational techniques for solving large-scale electromagnetic problems microstrip interconnects and rough surface scattering /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5878.

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23

Zurk, Lisa M. "Electromagnetic wave propagation and scattering in dense, discrete random media with application to remote sensing of snow /." Thesis, Connect to this title online; UW restricted, 1995. http://hdl.handle.net/1773/5981.

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24

Spagnoli, Kyle Edward. "An electromagnetic scattering solver utilizing shooting and bouncing rays implemented on modern graphics cards." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 75 p, 2008. http://proquest.umi.com/pqdweb?did=1601517961&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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25

Lee, Seung-Woo. "Computational electromagnetic approaches for the analysis of rough surface scattering and artificial composite materials /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/5997.

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26

Smith, Mark H. "Electromagnetic scattering from three-dimensional penetrable structures computed with combined-field integral equations on dual interlocking meshes." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/33629.

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27

Demir, Metin A. "Perturbation theory of electromagnetic scattering from layered media with rough interfaces." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1174660001.

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28

Salandrino, Alessandro. "Electromagnetic propagation anomalies in waveguiding structures and scattering systems." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5024.

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The effects related to diffraction and interference are ubiquitous in phenomena involving electromagnetic wave propagation, and are accurately predicted and described within the framework of classical electrodynamics. In the vast majority of the cases the qualitative features of the evolution of a propagating wave can be inferred even without detailed calculations. A field distribution will spread upon propagation, will accumulate phase along the direction of power flow, will exert mechanical forces upon scattering objects in the direction of propagation etc. When such predictions fail, counte
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29

Kozar, A. I. "Electromagnetic wave scattering by pyramid-shaped photonic crystal from resonant magnetodielectric spheres." Thesis, Eskisehir Technical University, 2021. https://openarchive.nure.ua/handle/document/18637.

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The solution of the problem of scattering electromagnetic waves with a discrete convex polyhedron - a pyramid of resonant magnetodielectric spheres based on a complex rhombic crystal lattice is presented.
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30

Trott, Keith Dennis. "A high frequency analysis of electromagnetic plane wave scattering by a fully illuminated perfectly conducting semi-infinite cone /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487323583622574.

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31

Lam, Chi Ming. "Theoretical and numerical studies of electromagnetic wave scattering from random media with random rough surfaces and discrete particles /." Thesis, Connect to this title online; UW restricted, 1992. http://hdl.handle.net/1773/5982.

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32

Chakraborty, Sankar. "Scalar, electromagnetic and elastic waves in periodic and certain broken-periodicity media /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9842515.

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33

Tap, Koray. "Complex source point beam expansions for some electromagnetic radiation and scattering problems." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1190015563.

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34

Chen, Jei Shuan. "Wave scattering from very rough surfaces and a study of backscattering enhancement /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/6051.

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35

Tran, Huong Ngoc 1966. "Identification of parameters describing a conductor-backed dielectric slab." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277151.

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In this parametric inverse problem, we consider a lossless dielectric slab excited by a transient plane wave. The scattered electric field from the slab is presented in the ray-optic and the complex-resonance forms. Our interest is to extract the complex-resonances of the system in order to identify the parameters that describe the scatterer. We review the signal processing procedure and the identification procedure employed to identity the poles of the system. We investigate the effect of noise on identification and determine the maximum amount of noise one can impose on the system. In additi
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36

YOUSIF, HASHIM AZEZ. "SCATTERING OF ELECTROMAGNETIC PLANE WAVES FROM TWO INFINITELY LONG PARALLEL CYLINDERS OF ARBITRARY MATERIALS AT OBLIQUE INCIDENCE." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184122.

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The Mueller scattering matrix elements (S(ij)) and the cross-sections for the scattering of an electromagnetic plane wave from two infinitely long, parallel, circular cylinders at oblique incidence are derived. Each cylinder can be of arbitrary materials (any refractive index). The incident wave can be in any polarization state. To find the scattering coefficients, which are essential for calculating S(ij) and the cross-sections, the multiple scatterings were taken into account for all orders such that the 'incident' field of one cylinder is the true incident field plus the scattered field fro
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37

Kim, Hyo Tae. "High frequency analysis of EM scattering from a circular conducting cylinder with dielectric/ferrite coating /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487322984315885.

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38

Rockway, John Dexter. "Integral equation formulation for object scattering above a rough surface /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/5832.

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39

Davidson, David Bruce. "Parallel algorithms for electromagnetic moment method formulations." Thesis, Stellenbosch : Stellenbosch University, 1991. http://hdl.handle.net/10019.1/69369.

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Thesis (PhD) -- Stellenbosch University, 1991.<br>ENGLISH ABSTRACT: This dissertation investigates the moment method solution of electromagnetic radiation and scattering problems using parallel computers. In particular, electromagnetically large problems with arbitrary geometries are considered. Such problems require a large number of unknowns to obtain adequate approximate solutions, and make great computational demands. This dissertation considers in detail the efficient exploitation of the potential offered by parallel computers for solving such problems, and in particular the class
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40

Forslund, Ola. "Scattering and propagation of electromagnetic waves in planar and curved periodic structures - applications to plane wave filters, plane wave absorbers and impedance surfaces." Doctoral thesis, KTH, Alfvén Laboratory, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3825.

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<p>The subject of this thesis is scattering of electromagneticwaves from planar and curved periodic structures. The problemspresented are solved in the frequency domain.</p><p>Scattering from planar structures with two-dimensionalperiodic dependence of constitutive parameters is treated. Theconstitutive parameters are assumed to vary continuously orstepwise in a cross section of a periodically repeating cell.The variation along a longitudinal coordinate z is arbitrary. Ageneral skew lattice is assumed. In the numerical examples, lowloss and high loss dielectric materials are considered. Thepro
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41

Seo, Seung Mo. "A fast IE-FFT algorithm for solving electromagnetic radiation and scattering problems." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1149105460.

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42

Hall, Jan-Ove. "Interaction between Electromagnetic Waves and Localized Plasma Oscillations." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4282.

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43

Haidara, Fatim M. "Rain scatter interference in satellite links." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43752.

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<p>Scattering by rain in addition to inducing attenuation and depolarization in satellite links can create intersystem interference. This type of interference was investigated extensively in the 1970's for terrestrial links, but little has been done to study its effects on modern and future satellite links. This thesis reports on studies of the potential interference created by the scattering of an uplink signal into an adjacent satellite and the inverse case where a downlink signal is scattered into the earth station of an adjacent satellite system. The thesis describes the rain medium in a w
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44

Pinheiro, Helder Fleury 1967. "The application of Trefftz-FLAME to electromagnetic wave problems /." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115703.

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Numerical analysis of the electromagnetic fields in large, complex structures is very challenging due to the high computational overhead. Recently, it has been shown that a new method called Trefftz-FLAME ( Flexible Local Approximation MEthod) is suitable for problems where there exist a large number of similar structures.<br>This thesis develops Trefftz-FLAME in two areas. First, a novel 2D Trefftz-FLAME method incorporates the modal analysis and port boundary condition that are essential to an accurate calculation of reflection and transmission coefficients for photonic crystal devices. The
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45

Pak, Kyung. "Studies of large-scale random rough surface scattering problems based on Monte Carlo simulations with efficient computation integral equations methods /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/5941.

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46

Meyer, Frans J. C. (Frans Johannes Christiaan). "Hybrid Finite Element/Boundary Element solutions of general two dimensional electromagnetic scattering problems." Thesis, Stellenbosch : Stellenbosch University, 1991. http://hdl.handle.net/10019.1/69271.

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Thesis (MEng) -- University of Stellenbosch, 1991.<br>ENGLISH ABSTRACT: A two-dimensional Coupled Element Method (CEM) for solving electromagnetic scattering problems involving lossy, inhomogeneous, arbitrarily shaped cylinders, was investigated and implemented. The CEM uses the Finite Element Method (FEM) to approximate the fields in and around the scatterer and the Boundary Element Method (BEM) to approximate the far-field values. The basic CEM theory is explained using the special, static electric field problem involving the solution of Laplace's equation. This theory is expanded to
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47

Begum, Syeda Rasheda. "The effect of cumulative forward and single large-angle scattering of an electromagnetic wave in a random medium." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/82898.

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A general discussion on propagation of an electromagnetic wave in a random medium is presented. Emphasis is placed on the bistatic scattering problem. The first phase of the investigation is focused on a random continuum. This is an extension of work done by de Wolf [19] recently. He derives a formal expression for the enhancement factor of the electromagnetic flux at large angles (excluding backscatter) from an extended weakly random medium. Enhancement describes the factor by which the singly-scattered flux is modified when the effects of cumulative forward scatterings are taken into account
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48

Polat, Ozgur Murat. "Ray Anlaysis Of Electromagnetic Scattering From Semi-infinite Array Of Dipoles In Free Space." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608347/index.pdf.

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Electromagnetic wave scattering from a semi-infinite array of dipoles in free space is described by using asymptotic high frequency methods. An electric field integral expression is obtained and solved with asymptotic high frequency methods. An asymptotic field expression is obtained for a finite &times<br>infinite array of dipoles in free space. The analytical closed form expression for the array guided surface wave launching coefficient is obtained via a combination of an asymptotic high frequency analysis of a related reciprocal problem and Lorentz reciprocity integral formulation for the s
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49

Pile, David Fujio Pelleas. "Extremely asymmetrical scattering of waves in periodic Bragg arrays." Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/15794/1/David_Pile_Thesis.pdf.

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This thesis fills in the gaps in the existing theory of wave phenomena in thick diffraction gratings at extreme angles of scattering, i.e. when the scattered wave propagates parallel or almost parallel to the grating boundaries. A consistent theory of a new type of Bragg scattering of bulk and guided optical modes in thick uniform and non-uniform, dissipative and non-dissipative, slanted periodic gratings has been developed. This type of scattering is called extremely asymmetrical scattering (EAS). One of the main distinctive features of EAS is the strong resonant increase of the scatter
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50

Pile, David Fujio Pelleas. "Extremely asymmetrical scattering of waves in periodic Bragg arrays." Queensland University of Technology, 2003. http://eprints.qut.edu.au/15794/.

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This thesis fills in the gaps in the existing theory of wave phenomena in thick diffraction gratings at extreme angles of scattering, i.e. when the scattered wave propagates parallel or almost parallel to the grating boundaries. A consistent theory of a new type of Bragg scattering of bulk and guided optical modes in thick uniform and non-uniform, dissipative and non-dissipative, slanted periodic gratings has been developed. This type of scattering is called extremely asymmetrical scattering (EAS). One of the main distinctive features of EAS is the strong resonant increase of the scatter
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