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Dissertations / Theses on the topic 'Electromagnetic Wave Propagation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Iskandarani, Saad S. "Electromagnetic wave propagation in anisotropic uniaxial slab waveguide." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182437230.

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2

Laine, Timo A. "Electromagnetic wave propagation in nonlinear kerr media." Doctoral thesis, KTH, Physics, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2989.

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3

Pelgur, Ali. "Modelling Of X-band Electromagnetic Wave Propagation." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608830/index.pdf.

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Calculation of electromagnetic wave propagation over irregular terrain is an important problem in many applications such as coverage calculations for radars or communication links. Many different approaches to this problem may be found in the literature. One of the most commonly used methods to solve electromagnetic boundary value problems is the Method of Moments (MoM). However, especially at high frequencies, the very large number of unknows required in the MoM formulation, limits the applicability of this method, since the memory requirement and the operation count increases by O(N2) and O(

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4

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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5

Eroglu, Abdullah Lee Jay Kyoon. "Electromagnetic wave propagation and radiation in gyrotropic medium." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2004. http://wwwlib.umi.com/cr/syr/main.

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6

Brennan, E. P. "Electromagnetic wave propagation control using LC anisotropic surfaces." Thesis, Queen's University Belfast, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431461.

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7

Rowlands, Michael Joseph 1974. "Electromagnetic wave propagation in a magnetized laboratory plasma." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/46186.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.<br>Includes bibliographical references (p. 60-61).<br>by Michael Joseph Rowlands.<br>B.S.<br>M.Eng.

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8

Foteinopoulou, Stavroula. "Electromagnetic Wave Propagation in Two-Dimensional Photonic Crystals." Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/822058-9BqHHS/native/.

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Thesis (Ph.D.); Submitted to Iowa State Univ., Ames, IA (US); 12 Dec 2003.<br>Published through the Information Bridge: DOE Scientific and Technical Information. "IS-T 2048" Stavroula Foteinopoulou. 12/12/2003. Report is also available in paper and microfiche from NTIS.

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9

Bassiri, Sassan Papas Charles Herach. "Electromagnetic wave propagation and radiation in chiral media /." Diss., Pasadena, Calif. : California Institute of Technology, 1987. http://resolver.caltech.edu/CaltechETD:etd-02282008-090141.

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10

Wallace, Jon. "Modeling Electromagnetic Wave Propagation in Electrically Large Structures." BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/91.

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Existing unified numerical electromagnetic methods are often unable to analyze electrically large structures due to the amount of memory and processing power required, necessitating approximate analyses with limited applicability. In this research a hybrid modeling methodology is adopted to solve these complex problems more efficiently than unified numerical methods and more accurately than analytical methods. Electromagnetic modeling problems are divided into two or more levels of scale. Each level analyzes a specific level of detail and only promotes the required information to the next leve

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11

Servin, Martin. "Nonlinear interaction and propagation of gravitational and electromagnetic waves in plasmas." Doctoral thesis, Umeå University, Physics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-122.

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<p>Gravitational waves and electromagnetic waves are important as carriers of energy and information. This thesis is devoted to the study of the propagation and interaction of these waves in plasmas, with emphasis on nonlinear effects and applications within astrophysics.</p><p>The physical systems are described by the Einstein-Maxwell-fluid equations or Einstein-Maxwell-Vlasov equations, when a kinetic treatment is required. The small amplitude and high-frequency approximation is employed for the gravitational waves, such that perturbative techniques can be applied and space-time can be consi

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12

Ordovas, Miquel Roland. "Covariant projection finite elements for transient wave propagation." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342285.

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13

Sen, Saffet Gokcen. "Investigation Of Electromagnetic Wave Propagation In Double Negative Materials." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609748/index.pdf.

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This thesis analyzes some aspects of electromagnetic wave propagation in double negative materials. Double negative materials have negative refractive indices. They are backward-wave materials. Plane waves undergo negative refraction at interfaces between double positive and double negative media. Causality principle implies these properties. High frequency plane wave scattering from a double negative infinitely long cylinder has been analyzed by using modified Watson transform, geometrical optics and Mie series. Mie series results and the modified Watson transform results have been found to b

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14

Fan, Taian. "Zero-Group-Velocity Propagation Of Electromagnetic Wave Through Nanomaterial." ScholarWorks @ UVM, 2016. https://scholarworks.uvm.edu/graddis/549.

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This research will investigate the problem on the propagation of electromagnetic wave through a specific nanomaterial. The nanomaterial analyzed is a material consisting of a field of Pt nanorods. This field of Pt nanorods are deposited on a substrate which consists of a RuO2 nano structure. When the nanorod is exposed to an electron beam emitted by a TEM (Transmission electron microscopy). A wave disturbance has been observed. A video taken within the chamber shows a wave with a speed in the scale of um/s (Á?10Á?^(-6) m/s), which is 14 orders of magnitude lower than speed of light in free spa

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15

Reese, Owein. "Homogenization of acoustic wave propagation in a magnetorheological fluid." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0430104-101629.

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16

Srikasem, Suthum. "Wave reflection in uniaxially anisotropic media." Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183062033.

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17

Häggblad, Jon. "Boundary and Interface Conditions for Electromagnetic Wave Propagation using FDTD." Licentiate thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-25744.

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Simulating electromagnetic waves is of increasing importance, for example, due to the rapidly growing demand of wireless communication in the fields of antenna design, photonics and electromagnetic compatibility (EMC). Many numerical and asymptotic techniques have been developed and one of the most common is the Finite-Difference Time-Domain (FDTD) method, also known as the Yee scheme. This centered difference scheme was introduced by Yee in 1966. The success of the Yee scheme is based on its relatively high accuracy, energy conservation and superior memory efficiency from the staggered form o

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18

Hakim, Ammar H. "High resolution wave propagation schemes for two-fluid plasma simulations /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/7024.

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19

Gonzalez, Escudero Alberto. "Three dimensional indoor electromagnetic wave propagation modeling using a hybrid method." Thesis, KTH, Elektroteknisk teori och konstruktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53438.

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The objective of this project has been to develop a method to predict three dimensional indoor electromagnetic propagation.For this purpose, a hybrid method has been introduced, consisting in modeling the hallways as waveguides with Perfect Electric Conductor walls, and analyzing the propagation from a modal point of view. Two different methods were used in order to model changes in the guide, Modal Match- ing for changes in width and height, and Finite Differences in Time Domain (FDTD) for the cases in which the translation symmetry is not maintained. Cuboids were used for the shape of the FD

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20

Winslow, Michael A. "OPTIMIZATION OF ELECTROMAGNETIC WAVE PROPAGATION THROUGH A HETEROGENEOUS LIQUID CRYSTAL LAYER." Monterey, California. Naval Postgraduate School, 2013. http://hdl.handle.net/10945/32919.

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Advances in technology have given way to concepts in warfare that were once constrained to the world of science fiction. In an effort to stay ahead of any potential adversarys weapons development, we must look down the path of countermeasures to high-energy electromagnetic weapons. In the attempt to engineer a material that can reduce transmitted beam intensity by the greatest factor, we look to liquid crystals. They have great potential to provide a starting point to engineer a material in order to show increased protection of DoD assets from high-energy beam weapons. We first develop one-dim

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21

Moss, Christopher D. Q. (Christopher Doniert Q. ). 1973. "Numerical methods for electromagnetic wave propagation and scattering in complex media." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/26909.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Vita.<br>Includes bibliographical references (p. 227-242).<br>Numerical methods are developed to study various applications in electromagnetic wave propagation and scattering. Analytical methods are used where possible to enhance the efficiency, accuracy, and applicability of the numerical methods. Electromagnetic induction (EMI) sensing is a popular technique to detect and discriminate buried unexploded ordnance (UXO). Time domain EMI sensing uses a transient primary magnetic

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22

Chen, Yi. "Propagation and Excitation of Electromagnetic Modes for Travelling-wave MRI Applications." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449158025.

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23

Williams, Thomas. "Full-wave simulation of high-frequency electromagnetic propagation through inhomogeneous plasma." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/8780/.

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The propagation of EM radiation past wavelength-sized inhomogeneities is not well understood, yet is of importance for both microwave heating and diagnostic applications in tokamaks. The work presented in this thesis improves this understanding; for this purpose, EMIT-3D, a new finite-difference time-domain (FDTD) code implementing a cold-plasma model has been written to extend full-wave simulations of propagation in magnetized plasmas to 3D. The numerical development of the algorithm is presented and supported with a new stability analysis. Studies of propagation past density filaments (`blob

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24

Taouk, Habib B. "Optical wave propagation in active media." Ohio : Ohio University, 1991. http://www.ohiolink.edu/etd/view.cgi?ohiou1173729381.

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25

Ziemba, David A. "Ducting conditions for electromagnetic wave propagation in tropical disturbances from GPS dropsonde data." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/39041.

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Approved for public release; distribution is unlimited.<br>In this thesis, more than 13000 vertical profiles from GPS-enabled dropsondes, recorded from 1996 through 2010, were analyzed to determine the characteristics of electromagnetic and electro-optical ducting in the boundary layer, an environmental condition that significantly affects the propagation of radio waves. A radio wave propagation duct is formed when there are significant gradients in the humidity and temperature profiles of the atmosphere. In this study, the frequency of occurrence and the characteristics (height, depth, and st

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26

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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27

Liu, Kexin. "Theoretical Investigation on Propagation and Coupling of Nonreciprocal Electromagnetic Surface Waves." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190792.

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This thesis aims at revealing the fundamental guiding and coupling properties of nonreciprocal electromagnetic surface waves on magneto-optical or gyromagnetic media and designing novel applications based on the properties. We introduce the background in the first chapter. We then describe the concept of nonreciprocity and the main calculation method in the second chapter. In the third chapter, we show that one-way waves can be sustained at the edge of a gyromagnetic photonic crystal slab under an external magnetic field. We also investigate the coupling between two parallel one-way waveguides

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28

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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29

Mason, Sammuel P. "Atmospheric effects on radio frequency (RF) wave propagation in a humid, near-surface environment." Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FMason.pdf.

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Thesis (M.S. in Meteorology)--Naval Postgraduate School, March 2010.<br>Thesis Advisor(s): Guest, Peter S. ; Goroch, Andreas K. "March 2010." Author(s) subject terms: Electromagnetic propagation, electromagnetic scattering, groundwave propagation, mathematical techniques, variance reduction. Includes bibliographical references (p. 67-68). Also available in print.

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30

Bittle, James R. "2017 Full Solar Eclipse| Observations and LWPC Modeling of Very Low Frequency Electromagnetic Wave Propagation." Thesis, University of Colorado at Denver, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10843376.

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<p> On August 21, 2017 a total solar eclipse occurred over the United States commencing on the west coast moving across to the east coast providing an opportunity to observe how the rapid day-night-day transition changed the ionosphere’s D-region electron density and how very low frequency (VLF) electromagnetic wave propagation was affected. To observe the solar obscurity effects, VLF receivers were deployed in two locations: one in the path of totality in Lakeside, Nebraska and another south of the totality path in Hugo, Colorado. The locations were chosen to achieve an orthogonal geome

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31

Wilson, Glenn Andrew, and glenn wilson@griffith edu au. "Plane Wave Propagation Problems in Electrically Anisotropic and Inhomogeneous Media with Geophysical Applications." Griffith University. School of Microelectronic Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030325.210206.

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Boundary value problems required for modelling plane wave propagation in electrically anisotropic and inhomogeneous media relevant to the surface impedance methods in electromagnetic geophysics are formally posed and treated. For a homogeneous TM-type wave propagating in a half space with both vertical and horizontal inhomogeneities where the TM-type wave is aligned with one of the elements of the conductivity tensor, it is shown using exact solutions that the shearing term in the homogeneous Helmholtz equation for inclined anisotropic media: [Equation 1], unequivocally vanishes and solutions

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32

Wilson, Glenn Andrew. "Plane Wave Propagation Problems in Electrically Anisotropic and Inhomogeneous Media with Geophysical Applications." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365776.

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Boundary value problems required for modelling plane wave propagation in electrically anisotropic and inhomogeneous media relevant to the surface impedance methods in electromagnetic geophysics are formally posed and treated. For a homogeneous TM-type wave propagating in a half space with both vertical and horizontal inhomogeneities where the TM-type wave is aligned with one of the elements of the conductivity tensor, it is shown using exact solutions that the shearing term in the homogeneous Helmholtz equation for inclined anisotropic media: [Equation 1], unequivocally vanishes and solutions

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33

Buchanan, William J. "Analysis of electromagnetic wave propagation using 3D finite-difference time-domain methods with parallel processing." Thesis, Edinburgh Napier University, 1996. http://researchrepository.napier.ac.uk/Output/4022.

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The 3D Finite-Difference Time-Domain (FDTD) method simulates structures in the time-domain using a direct form of Maxwell's curl equations. This method has the advantage over other simulation methods in that it does not use empirical approximations. Unfortunately, it requires large amounts of memory and long simulation times. This thesis applies parallel processing to the method so that simulation times are greatly reduced. Parallel processing, though, has the disadvantage in that simulation programs require to be segmented so that each processor processes a separate part of the simulation. An

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34

Osaretin, Idahosa Andrew. "Theoretical Model and Electromagnetic Wave Propagation Characteristics for the Magnetoelectric Effect in Layered Piezoelectric and Piezomagnetic Composites." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1297272494.

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35

Ryan, Patrick L. "Radio frequency propagation differences through various transmissive materials." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc5801/.

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The purpose of this research was to determine which of the commonly used wireless telecommunication site concealment materials has the least effect on signal potency. The tested materials were Tuff Span® fiberglass panels manufactured by Enduro Composite Systems, Lexan® XL-1 polycarbonate plastic manufactured by GE Corporation and Styrofoam polystyrene board manufactured by The Dow Chemical Company. Testing was conducted in a double electrically isolated copper mesh screen room at the University of North Texas Engineering Technology Building in Denton, Texas. Analysis of the data found no d

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36

Almehrezi, Ali. "Local meteorology and its effect on electromagnetic wave propagation over the southern coast of the Arabian Gulf." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/8307.

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The propagation of electromagnetic (EM) waves of frequencies above 100MHz is affected by the existence and properties of the atmospheric duct, i.e. a horizontal layer in the lower atmosphere in which radio signals propagate more efficiently. Atmospheric ducts can be found in many parts of the world ocean including the Arabian Gulf. Ambient winds blowing from different directions bring air masses of different properties into the area and hence have a significant impact on the formation and strength of the atmospheric duct. However, little information is available on the long-term and intra-annu

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37

Thakur, Anuja. "Outside cell interference dynamics in cellular code division multiple access." Ohio : Ohio University, 2003. http://www.ohiolink.edu/etd/view.cgi?ohiou1071070073.

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38

Boubakra, Abdelkrim. "Etude de la propagation d'une onde electromagnetique de surface de type he : :(11) en hyperfrequence." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF21033.

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On etudie en hyperfrequence d'un point de vue analytique, numerique et experimental, la propagation d'une onde electromagnetique de type he::(11) a la surface d'un conducteur cylindrique gaine d'une couche dielectrique, un deuxieme dielectrique occupant le reste de l'espace

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39

Otto, Tobias. "Propagation effects influencing polarimetric weather radar measurements." Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-71125.

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Ground-based weather radars provide information on the temporal evolution and the spatial distribution of precipitation on a macroscopic scale over a large area. However, the echoes measured by weather radars are always a superposition of forward and backward scattering effects which complicates their interpretation. The use of polarisation diversity enhances the number of independent observables measured simultaneously. This allows an effective separation of forward and backward scattering effects. Furthermore, it extends the capability of weather radars to retrieve also microphysical informa

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40

Spencer, Troy Allan. "Inverse diffraction propagation applied to the parabolic wave equation model for geolocation applications." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16681/1/Troy_Allan_Spencer_Thesis.pdf.

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Localisation, which is a mechanism for discovering the spatial relationship between objects, is an area that has received considerable research and development in recent times. A common name given to localisation operations based on the absolute reference frame of Earth is Geolocation. One important example of geolocation research is E-911, where wireless carriers in the United States must provide the location of 911 callers. The operation of E-911 can be based on either a network configuration, or the Global Positioning System (GPS). With the importance of localisation being acknowledged, a r

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41

Spencer, Troy Allan. "Inverse diffraction propagation applied to the parabolic wave equation model for geolocation applications." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16681/.

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Localisation, which is a mechanism for discovering the spatial relationship between objects, is an area that has received considerable research and development in recent times. A common name given to localisation operations based on the absolute reference frame of Earth is Geolocation. One important example of geolocation research is E-911, where wireless carriers in the United States must provide the location of 911 callers. The operation of E-911 can be based on either a network configuration, or the Global Positioning System (GPS). With the importance of localisation being acknowledged, a r

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42

Clemente, Arenas Mark. "Application de la transformation d'espace à la conception d'antennes à diagramme de rayonnement contrôlé." Thesis, Paris, ENST, 2014. http://www.theses.fr/2014ENST0074/document.

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La transformation d'espace (TE) a été développée par J. B. Pendry et U. Leonhardt en 2006 et suscite un énorme intérêt depuis la démonstration expérimentale de la première cape d'invisibilité en micro-ondes. Cette technique permet de contrôler la propagation des ondes en modifiant les propriétés électromagnétiques de l'espace. Malgré quelques limitations liées à la bande passante ou aux pertes consécutives à l'utilisation de métamatériaux pour les dispositifs TE, cette technique a attiré l'attention de nombreux domaines (optique, microondes, acoustique, etc). L'objectif de cette thèse est de d

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43

Li, Ming. "The study of electromagnetic wave propagation in photonic crystals via planewave based transfer (scattering) matrix method with active gain material applications." [Ames, Iowa : Iowa State University], 2007.

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44

MAROUAN, YOUSSEF. "Etat de polarisation et caracteristiques de propagation moyennes d'emissions em naturelles dans un magnetoplasma froid : application aux donnees ebf du satellite aureol-3." Orléans, 1988. http://www.theses.fr/1988ORLE2040.

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Observation supposee effectuee en un point fixe de l'espace. Cette observation consiste en la mesure simultanee d'au moins trois composantes du champ electromagnetique. Discussion des estimateurs du degre de polarisation proposes par samson. Simulation numerique. Identification experimentale des modes d'une onde multiple en propagation dans ce magnetoplasma (ou deux modes peuvent coexister), obtenue a partir des caracteristiques de polarisation des ondes. Application aux emissions tres basse frequence observees par satellite aureol-3

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45

Otto, Tobias. "Propagation effects influencing polarimetric weather radar measurements." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2010. https://monarch.qucosa.de/id/qucosa%3A19554.

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Ground-based weather radars provide information on the temporal evolution and the spatial distribution of precipitation on a macroscopic scale over a large area. However, the echoes measured by weather radars are always a superposition of forward and backward scattering effects which complicates their interpretation. The use of polarisation diversity enhances the number of independent observables measured simultaneously. This allows an effective separation of forward and backward scattering effects. Furthermore, it extends the capability of weather radars to retrieve also microphysical informa

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46

Clemente, Arenas Mark. "Application de la transformation d'espace à la conception d'antennes à diagramme de rayonnement contrôlé." Electronic Thesis or Diss., Paris, ENST, 2014. http://www.theses.fr/2014ENST0074.

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La transformation d'espace (TE) a été développée par J. B. Pendry et U. Leonhardt en 2006 et suscite un énorme intérêt depuis la démonstration expérimentale de la première cape d'invisibilité en micro-ondes. Cette technique permet de contrôler la propagation des ondes en modifiant les propriétés électromagnétiques de l'espace. Malgré quelques limitations liées à la bande passante ou aux pertes consécutives à l'utilisation de métamatériaux pour les dispositifs TE, cette technique a attiré l'attention de nombreux domaines (optique, microondes, acoustique, etc). L'objectif de cette thèse est de d

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47

Ehn, Jonas. "Propagation of Radio Waves in a Realistic Environment using a Parabolic Equation Approach." Thesis, Linköpings universitet, Teoretisk Fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157610.

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Radars are used for range estimation of distant objects. They operate on the principle of sending electromagnetic pulses that are reflected off a target. This leads to the propagation of electromagnetic waves over large distances. As the waves propagate, they are affected by several aspects that decrease the performance of the radar system. In this master thesis, we derive a mathematical model that describes electromagnetic propagation in the troposphere. The model developed is based on a parabolic equation and uses the split-step Fourier method for its numerical solution. Using the model, we

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48

Rougier, Benoit. "Étude à coeur des propriétés de matériaux innovants par la compréhension de la propagation d'une onde électromagnétique à travers une onde de choc." Thesis, Toulouse, INPT, 2019. http://oatao.univ-toulouse.fr/24081/1/rougier.pdf.

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La détermination des propriétés des matériaux soumis à des chocs est un enjeu essentiel dans de nombreux domaines industriels. L’objectif de cette thèse est de proposer une nouvelle méthode fondée sur l’interrogation en bande millimétrique d’un solide soumis à un choc. Deux paramètres doivent être mesurés simultanément, la vitesse du choc et la vitesse matérielle associée afin de pouvoir construire la polaire de choc du matériau d’étude. Dans un premier temps, un état de l’art des techniques de mesure existantes est réalisé pour cibler les performances et limites de l’existant. Dans un second

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Groters, Douglas J. "The temporal and spatial variability of the marine atmospheric boundary layer and its effect on electromagnetic propagation in and around the Greenland Sea marginal ice zone." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23422.

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Approved for public release; distribution is unlimited<br>Variability of the MABL and its effect on the electromagnetic (EM) refractive structure around the Greenland Sea marginal ice zone were examined. Rawinsonde profiles and surface observations collected from 3 ships during MIZEX-87(20 March-11 April) served as the data set. A program, developed to calculate the refractivity at each vertical level of the rawinsonde profiles, also identified the levels at which trapping, superrefraction and subrefraction occurred. Temporal studies showed that a higher incidence of anomalous refractive layer

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Zhou, Hang. "Modélisation de la propagation atmosphérique d'ondes électromagnétiques en 2D et 3D à partir de transformées de Fourier et en ondelettes." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30018/document.

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La propagation à longue distance est un problème majeur dans les télécommunications, la navigation et la surveillance. L'objectif de cette thèse est de développer une méthode rapide pour simuler la propagation des ondes dans une atmosphère en 2D et 3D. Dans ce travail, deux contributions principales vers cet objectif sont obtenues. Tout d'abord, des méthodes auto-cohérentes,c'est-à-dire basées sur une théorie discrète de l'électromagnétisme, sont développées en 2D et 3D. Ensuite, une méthode rapide 2D basée sur les ondelettes est proposée. Pour simuler la propagation d'ondes électromagnétiques

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