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Showing result 1 - 5 of 26 swedish dissertations matching the above criteria.
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1. Computational electromagnetics : software development and high frequency modeling of surface currents on perfect conductors
Abstract : In high frequency computational electromagnetics, rigorous numerical methods be come unrealistic tools due to computational demand increasing with the frequency. Instead approximations to the solutions of the Maxwell equations can be employed to evaluate th electromagnetic fields. READ MORE
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2. Inverse and optimization problems in electromagnetics -- a finite-element method perspective
Abstract : In this thesis, a selection of inverse and optimization problems are studied where the finite element method (FEM) serves as a comprehensive tool to solve electromagnetic field problems that lack an analytic solution. The inverse problems are typically formulated in terms of an optimization problem where the misfit between a measurement and the corresponding result of a computational model is minimized. READ MORE
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3. Hybrid Methods for Computational Electromagnetics in Frequency Domain
Abstract : In this thesis we study hybrid numerical methods to be used in computational electromagnetics. The purpose is to address a wide frequency range relative to a given geometry. We also focus on efficient and robust numerical algorithms for computing the so called Smooth Surface Diffraction predicted by Geometrical Theory of Diffraction (GTD). READ MORE
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4. Material distribution-based topology optimization for wave propagation problems
Abstract : This thesis employs material distribution-based topology optimization for wave propagation problems. In the material distribution approach, we define a material indicator function that models the presence and absence of material in a design domain. READ MORE
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5. Simulation of Electro-Optic Modulators by a Time-Domain Beam-Propagation Method
Abstract : Electro-optic modulators (EOMs) are components which convert electric signals to optical ones. They are needed, e.g., at the transmitter end of fiber-optic communication systems and in time-stretch analog-to-digital converters. READ MORE