Dispersion of dielectric composites: Quasi-dynamic characterizations and applications

Jiaran Qi

    Research output: ThesisDoctoral ThesisCollection of Articles


    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.
    Translated title of the contributionDispersion of dielectric composites : quasi-dynamic characterizations and applications
    Original languageEnglish
    QualificationDoctor's degree
    Awarding Institution
    • Aalto University
    • Sihvola, Ari, Supervising Professor
    • Sihvola, Ari, Thesis Advisor
    Print ISBNs978-952-60-4210-7
    Electronic ISBNs978-952-60-4211-4
    Publication statusPublished - 2011
    MoE publication typeG5 Doctoral dissertation (article)


    • homogenization
    • dispersion
    • permittivity
    • S-parameter retrieval
    • angular dispersion
    • Lord Rayleigh formula
    • quasi-static and quasi-dynamic

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