Functionalization of glass fiber woven fabrics by ITO coatings and characterization of their electromagnetic properties

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Merve Özdil Darıcıoğlu Thesis.pdf

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2022-1-14

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Özdil Darıcıoğlu, Merve

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ITO sols were deposited on glass fiber woven fabrics by spray pyrolysis technique and electrical conductivity of these layers was controlled to incorporate electromagnetic (EM) wave absorbing characteristics to glass fabrics. The surface functionalized fabrics were used as reinforcement in a hybrid type multilayer EM wave absorbing composite which is a combination of Jaumann and graded type absorbers effective in 8-12 GHz frequency range (X-band). The effects of the conductivity and the cascading order for ITO coated layers on the electromagnetic behavior of the hybrid type multilayered composite were investigated. The main objective was to create a guideline for the design of multilayer EM wave absorbing composite according to the needs of a specific application. The highest composite design has been formed by cascading six ITO coated fabrics both with and without metal sheet placed at the back of the composite. This composite has ~-11 dB reflection loss and ~-9 dB transmission loss which corresponds to ~85% average absorption without metallic sheet, while its reflection loss and average absorption values are ~-10.5 dB and ~93%, respectively, in the X-band with metallic backing. The front layer of multilayered structure with the lowest surface conductivity provided impedance matching between air and the receiving surface of the composite minimizing reflection, where the gradual increase in surface conductivity of the layers towards the back provided balanced internal reflection and transmission leading to high overall EM wave absorption. Consequently, by controlling the grading of the surface conductivity of the layers the reflection and transmission response of the multilayered composites can be adjusted to provide tailored characteristics for the required EM wave absorption levels.

Subject Keywords

Indium tin oxide, Spray pyrolysis technique, Electromagnetic wave absorber, Reflection loss, Transmission loss

URI

https://hdl.handle.net/11511/95949

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. Özdil Darıcıoğlu, “Functionalization of glass fiber woven fabrics by ITO coatings and characterization of their electromagnetic properties,” M.S. - Master of Science, Middle East Technical University, 2022.