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Dielectric characterization of conducting textiles using free space transmission measurements: accuracy and methods for improvement

Håkansson, Eva, Amiet, Andrew and Kaynak, Akif 2007, Dielectric characterization of conducting textiles using free space transmission measurements: accuracy and methods for improvement, Synthetic metals, vol. 157, no. 24, pp. 1054-1063.

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Title Dielectric characterization of conducting textiles using free space transmission measurements: accuracy and methods for improvement
Author(s) Håkansson, Eva
Amiet, Andrew
Kaynak, Akif
Journal name Synthetic metals
Volume number 157
Issue number 24
Start page 1054
End page 1063
Publisher Elsevier Sequoia
Place of publication Lausanne, Switzerland
Publication date 2007-12
ISSN 0379-6779
Keyword(s) polypyrrole
thin films
electromagnetic interference shielding
permittivity
free space method
Summary The dielectric behaviour of in-situ polymerized thin polypyrrole (PPy) films on synthetic textile substrates were obtained in the 1–18 GHz region using free space transmission and reflection methods. The PPy/para-toluene-2-sulphonic acid (pTSA) coated fabrics exhibited an absorption dominated total shielding effectiveness (SE) of up to −7.34 dB, which corresponds to more than 80% of incident radiation. The permittivity response is significantly influenced by the changes in ambient conditions, sample size and diffraction around the sample. Mathematical diffraction removal, time-gating tools and high gain horns were utilized to improve the permittivity response. A narrow time-gate of 0.15 ns produced accurate response for frequencies above 6.7 GHz and the high gain horns further improved the response in the 7.5–18 GHz range. Errors between calculated and measured values of reflection were most commonly within 2%, indicating good accuracy of the method.
Language eng
Field of Research 091209 Polymers and Plastics
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2007, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007634

Document type: Journal Article
Collections: School of Engineering and Information Technology
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Created: Mon, 29 Sep 2008, 08:54:22 EST