On the effect of a spherical shield on the radiation Q and efficiency of ideal dipole antennas

Johan C.-E. Sten (Corresponding Author), Arto Hujanen

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    A method is developed for calculating the radiation efficiency and quality factor, Q, for azimuthally symmetric electric (Tm) and magnetic (Te) multipole fields surrounded by a semi-transparent spherical shield of variable thickness, dielectric and magnetic constants involving losses. A matrix method is used to connect the transverse field components at adjacent interfaces. The Q and efficiency are determined by computing the energy stored in the near field of the multipole as well as the power radiated and dissipated in the shield. A numerical comparison of the performance of electric and magnetic dipole radiators is given as a function of frequency. An expression is derived for the permittivity of the shield which optimisés the Q.
    Original languageEnglish
    Pages (from-to)705-720
    Number of pages16
    JournalAnnales des télécommunications
    Volume61
    Issue number5-6
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

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