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 16 of 16 for “"PROPAGATION OF ELECTROMAGNETIC WAVES"”.
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Propagation of electromagnetic waves in spatially dispersive inhomogeneous media
… This thesis investigates the behaviour of electromagnetic waves in spatially dispersive, inhomogeneous media. In particular, two types of inhomogeneity are considered: media formed from two homogeneous regions with a common interface, and those with a periodic structure. For a material …
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Effects of statistical variations on propagation of electromagnetic waves in disordered periodic structures
… theory is employed to investigate the impact of statistical variations in material parameters and lumped-element values on the transmission properties of transmission-line based metamaterial structures. The theory yields closed-form expressions for the calculation of the propagation constant …
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A STUDY FOR THE PROPAGATION OF ELECTROMAGNETIC WAVES OVER IMPERFECT GROUND PLANES BASED ON SCHELKUNOFF INTEGRALS
<p>A new formulation for the analysis of propagation of electromagnetic waves over imperfectly conducting planar surfaces is proposed. The classical approach for the analysis of this problem uses the Sommerfeld formulation. In Sommerfeld formulation, the wave function corresponding to a point …
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Reconfigurable, two-dimensional plasma photonic crystals
Photonic crystals, composed of arrays of microplasmas, affect the propagation of electromagnetic waves and can act as reconfigurable filters in the GHz-THz spectral regions. Plasma photonic crystals are reconfigurable at electronic speeds. In addition, they rapidly alter the transmission …
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Particle shape corrections to Twersky's formalism for multiple scattering in a random particulate medium
… forty years, much work has been done in the area of multiple scattering effects on the propagation of electromagnetic waves in a random particulate medium. This work is important to wave propagation in the atmosphere, the planetary sphere, and the ocean. Current research is aimed at high …
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A theoretical study of some transport processes in semiconductors
The problems discussed range from the scattering of electrons byimpurity potentials to the propagation of electromagnetic waves in anon-active plasma.In particular the theory of dipole scattering in semiconductors isconsidered in some detail. The earlier part of text contains a discussionof the …
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Millimeter Through Visible Frequency Waves Through Aerosols: Particle Modeling, Reflectivity and Attenuation
This thesis addresses the problem of modeling atmospheric aerosol (such as haze and fog) particle-size distributions in order to predict the effects (such as attenuation and reflectivity) that these particles have upon the propagation of electromagnetic waves of micrometer range wavelengths. …
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Design of reflectarray antenna integrated with FSS textured configurations for wireless communication applications
… improvement. Moreover the design requirements of spacecraft antennas for satellite communications and telecommunication missions require multifunction antennas to prevent the propagation of electromagnetic waves in certain frequency bands. This project investigates the feasibility of employing …
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Optimal Hybrid MIMO Beamforming Designs for Energy-Efficient Communication Systems
The rapid expansion of wireless networks has resulted in spectrum sharing among many connected devices, creating challenges in interference management and increasing energy consumption, which further worsens the carbon footprint. In this context, hybrid multiple-input multiple-output (MIMO) …
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Molecular simulations of the interaction of microwaves with fluids
The interaction of electromagnetic radiation with matter has led to a large number of interesting applications. The propagation of electromagnetic waves within materials is described by Maxwell's equations. However, the fundamental understanding of the causes of the response of the material, …
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Design, modelling and implementation of antennas using electromagnetic bandgap material and defected ground planes
The main objective of this research is to design, model and implement several antenna geometries using electromagnetic band gap (EBG) material and a defected ground plane. Several antenna applications are addressed with the aim of improving performance, particularly the mutual coupling between the …
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High Order Energy - Conserved Splitting FDTD Methods for Maxwell's Equations
Computation of Maxwell's equations has been playing an important role in many applications, such as the radio-frequencies, microwave antennas, aircraft radar, integrated optical circuits, wireless engineering and materials, etc. It is of particular importance to develop numerical methods to solve …
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Nanostructured composite materials based on carbon nanotubes and 3-D photonic crystals
… in an attempt to combine the properties of polymer and CNT in a single film. Such composites were mainly formed by mixing carbon nanotubes within the polymer without special emphasis on the structure and thereby, the nanoscopic properties of the resultant material. Photonic crystals …
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Transient Electromagnetic Waves in Nonlinear Media
This thesis is concerned with the propagation of transient electromagnetic waves in nonlinear media. It consists of a General Introduction and five scientific papers. The General Introduction gives a broad overview of nonlinear electromagnetic phenomena. The emphasis is on the representation of the …
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Photonic Crystals with Alternate Arrays of Rods and Holes in a Low Dielectric-Index Material
<p>This thesis theoretically deals with the propagation of electromagnetic waves (light beams) in periodically modulated dielectric material structures based on Maxwell’s equations. We are interested in novel light propagation characteristics in these man-made dielectric material structures for …