Dispersion of dielectric composites : quasi-dynamic characterizations and applications

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Sähkötekniikan korkeakoulu | Doctoral thesis (article-based)
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Aalto University publication series DOCTORAL DISSERTATIONS , 61/2011
Characterization of the dispersion of macroscopic electromagnetic properties of composite materials is a challenging task, but it offers an efficient and effective path to interpret features or phenomena, and to design artificial structures with desired properties. In this thesis, the quasi-dynamic homogenization is performed to characterize the dispersive electric properties of a class of dielectric composites. Although their geometry configurations are very simple, many fundamental yet significant features as well as problems appear during the quasi-dynamic homogenization process, and are thus studied in detail. The quasi-dynamic region is defined to include the quasi-static one and the frequency range close to the quasi-static limit. This thesis focuses on various homogenization models and techniques. In addition, the homogenization results by the proposed techniques are applied to explore several significant homogenization-related problems, such as quantification of the quasi-static limit, evaluation of a homogenization model, as well as the temporal pulse dynamics in dielectric (composite) materials.
homogenization, dispersion, permittivity, S-parameter retrieval, angular dispersion, Lord Rayleigh formula, quasi-static and quasi-dynamic
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  • [Publication 1]: Jiaran Qi and Ari Sihvola. 2011. Dispersion of the dielectric Fröhlich model and mixtures. IEEE Transactions on Dielectrics and Electrical Insulation, volume 18, number 1, pages 149-154.
  • [Publication 2]: Jiaran Qi, Henrik Kettunen, Henrik Wallén, and Ari Sihvola. 2010. Quasi-dynamic homogenization of geometrically simple dielectric composites. Applied Computational Electromagnetics Society Journal, volume 25, number 12, pages 1036-1045.
  • [Publication 3]: Henrik Kettunen, Jiaran Qi, Henrik Wallén, and Ari Sihvola. 2011. Homogenization of thin dielectric composite slabs: techniques and limitations. Applied Computational Electromagnetics Society Journal, volume 26, number 3, pages 179-187.
  • [Publication 4]: Jiaran Qi, Henrik Kettunen, Henrik Wallén, and Ari Sihvola. 2010. Compensation of Fabry–Pérot resonances in homogenization of dielectric composites. IEEE Antennas and Wireless Propagation Letters, volume 9, pages 1057-1060.
  • [Publication 5]: Jiaran Qi, Henrik Kettunen, Henrik Wallén, and Ari Sihvola. 2011. Different homogenization methods based on scattering parameters of dielectric-composite slabs. Radio Science, volume 46, RS0E08, 7 pages.
  • [Publication 6]: J. Qi and A. Sihvola. 2009. Truncation effect on precursor field structure of pulse propagation in dispersive media. Progress In Electromagnetics Research B, volume 14, pages 65-86.
  • [Publication 7]: Jiaran Qi and Ari Sihvola. 2009. Evolution of the time-domain structure of electromagnetic pulse propagating in aqueous mixtures. In: Pertti Vainikainen and Tommi Laitinen (editors). Proceedings of the 8th International Conference on Electromagnetic Wave Interaction with Water and Moist Substances (ISEMA 2009). Espoo, Finland. 1-5 June 2009. International Society for Electromagnetic Aquametry. Pages 223-230. ISBN 978-951-22-9940-9.