Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Electromagnetic wave propagation"”.
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Electromagnetic wave propagation on helical conductors
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1951.
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Modeling Electromagnetic Wave Propagation in Electrically Large Structures
<p>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 …
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Electromagnetic wave propagation in a magnetized laboratory plasma
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.
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Numerical methods for electromagnetic wave propagation and scattering in complex media
… 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 …
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Low-Frequency Subsurface Electromagnetic Modeling
Subsurface electromagnetic (EM) methods are applied to obtain underground information that is not available from surface observations. This research develops numerical methods for subsurface electromagnetic modeling. The dissertation includes: (1) fast one-dimensional forward and inverse modeling, …
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Simulation methods for plasmonic structures
… there has been a growing interest in studying electromagnetic wave propagation at the nanoscale. The interaction of light with metallic nanostructures produces a collective excitation of conduction electrons at the metal surface, also known as surface plasmons. These plasmonic resonances enable …
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Finite difference time domain simulation of subpicosecond semiconductor optical devices
… The problem under studying involves both electromagnetic wave propagation and semiconductor dynamic transport, which is a nonlinear phenomenon. Finite difference time domain (FDTD) technique is used to approximate the time dependent Maxwell's equations for full-wave analysis of the wave …
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A geodesic finite-difference time-domain model of magnetized plasma
Electromagnetic wave propagation in the Earth-ionosphere cavity presents an interesting challenge for simulations. Three-dimensional latitude-longitude finite-difference time-domain (FDTD) models accounting for the bathymetry, topography and ionosphere have been developed and applied towards a …
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Modern electromagnetic scattering
We develop a numerically stable algorithm for electromagnetic wave propagation through planar stratified media. This algorithm is implemented in a modern programming language and is suitable for the study of such applications as Anderson localization and perfect lensing. Our algorithm remains …
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Design of reconfigurable intelligent surface for 5G wireless communication system
… offering unprecedented control over electromagnetic wave propagation in various environments. In addition, RISs can be fabricated with low cost and can be controlled easily by the user. Meanwhile, RIS has wide adaption to the optimization algorithm, low power consumption. With all the …
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Low frequency indoor radiolocation
This thesis concerns the application of electromagnetic wave propagation to the problem of indoor radiolocation. Determining the location of people and objects relative to their environment is crucial for asset tracking, security, and human-computer interface (HCI) applications. These applications …
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Studies of coaxial multipactor in the presence of a magnetic field
… magnetic field transverse to the direction of electromagnetic wave propagation. Studies on the Coaxial Multipactor Experiment (CMX) show that the magnetic field decreases the degree to which the discharge detunes the RF circuit. However, it enhances the susceptibility of the system to …
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Electromechanical Wave Propagation Analysis
… angle deviations propagate as electromechanical waves (EMWs) throughout the power system. These waves became observable since the development of synchrophasor measurement instruments. The speed of EMW propagation is hundreds of miles per second, much less than the electromagnetic wave propagation …
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Precise orbit determination of the Mars Odyssey spacecraft and geodetic inversion for the Martian gravity field
… data sets and models are combined: electromagnetic wave propagation, with tropospheric and ionospheric corrections; tracking station positions, including tidal and tracking station corrections; solar and thermal radiation; ephemerides of all the major bodies in the Solar System, plus …
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Applications of Artificial Intelligence to Electromagnetism and Indoor Wireless Networks
… and user requirements, calls for expedient electromagnetic wave propagation modelling tools and optimisation frameworks that can assist the design of ICNs, ensuring the orchestrated and prosperous operation of the wireless ecosystem. Furthermore, to enable their optimal functionality it is …
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Development of a Multifluid Magnetohydrodynamic Model for Anisotropic, Partially Ionized Plasmas
… coupled to the Maxwell's equations which govern electromagnetic wave propagation within the plasma and a Bhatnagar-Gross-Krook (BGK) relaxation time approximation is used to model non-equilibrium collisional processes between the plasma species. Chemical kinetic models are included to represent …
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Homogenization of Structured Metasurfaces and Uniaxial Wire Medium Metamaterials for Microwave Applications
In recent years, the study of electromagnetic wave interaction with artificial media has been the subject of intense research interest due to their extraordinary properties such as negative refraction, partial focusing, enhanced transmission, and spatial filtering, among others. Artificial media …
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Artificial Impedance Surfaces and Wire Media for Absorption and Cloaking
… includes two parts which focus on the electromagnetic wave propagation in absorbers formed by stacked metasurfaces and structured wire media, and electromagnetic wave interaction with the cylindrical cloaking structures. In the first part, we propose a variety of physical systems that …
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Power Transmission Loss Due to Periodic Loading In Multi-Gigabit Data Signaling Interconnects
… interconnect bandwidth demand to the millimeter wave regime. As the Frequency content of the signals increase, micro scale structures of an interconnect medium, such as the woven glass fabric reinforcements of PCB's, can negatively influence the performance of PCB signal transmission. </p> <p>The …
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