Degree Type

Thesis

Date of Award

2008

Degree Name

Master of Science

Department

Materials Science and Engineering

First Advisor

Nicola Bowler

Second Advisor

Xiaoli Tan

Third Advisor

Jaeyoun Kim

Abstract

There are many instances where it is desirable to absorb specific frequencies of microwave radiation. Areas of interest include radar applications, enhancing the performance of cell phones, and in microwave-assisted curing of thermosets. An alternative to the current use of ferromagnetic particles dispersed in a matrix is to take advantage of dielectric relaxation due to interfacial polarization as the means of electromagnetic absorption.;Three composite materials composed of polydisperse electroless, polydisperse sputtered, or monodisperse electroless nickel-coated particles are examined for their electromagnetic properties in the microwave range. Complex permittivity and permeability as a function of frequency and volume fraction are presented. These results are compared against the theoretical real and imaginary permittivity calculated using the effective medium theories of Sihvola-Lindell, Harfield, and Hanai-Bruggeman. The microwave absorbing properties of these composites as a function of thickness and frequency are then compared.

DOI

https://doi.org/10.31274/rtd-180813-16543

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Nathan Lee Fischer

Language

en

Proquest ID

AAI1453127

OCLC Number

235944013

ISBN

9780549541974

File Format

application/pdf

File Size

81 pages

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