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Electromagnetic Homogenization-simulations of Materials
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis aims to determine the distribution of the relative permittivity for random mixtures of material using electromagnetic simulations. The algorithm used in the simulations is the FDTD method which solves Maxwell's equations numerically in the time-domain. The material is modeled as randomly shaped particles with radius 12 ± 10 micrometre in x- and y-direction and radius 3 ± 1 micrometre in zdirection. The scattering parameters from the transmitted and reflected electric field when a plane wave interacts with the material are measured. The relative permittivity is determined from the scattering parameters using the iterative Baker-Jarvis method. The simulations shows that both the distribution and the value of the relative permittivity is low when the particles have non conducting layers to force interruptions to prevent percolation, a conducting path between the particles. The most important result is of the kind where the simulations do not have any boundaries to prevent percolation. These simulations reflects how the relative permittivity distributes in real measurements. It is established that the value of the relative permittivity has a large distribution and also that percolation occurs because of the periodic structures.

Place, publisher, year, edition, pages
2019.
Series
UPTEC E, ISSN 1654-7616 ; 19024
Keywords [en]
relative permittivity, electromagnetic simulations, FDTD method, scattering parameters, transmitted electric field, reflected electric field, plane wave, wave guides, percolation
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-395866OAI: oai:DiVA.org:uu-395866DiVA, id: diva2:1365457
Educational program
Master Programme in Electrical Engineering
Supervisors
Examiners
Available from: 2019-10-25 Created: 2019-10-24 Last updated: 2019-10-25Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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Output format
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