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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    Dipole antennas
    Radiation
    Radiators
    Permittivity

    Cite this

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    title = "On the effect of a spherical shield on the radiation Q and efficiency of ideal dipole antennas",
    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 optimis{\'e}s the Q.",
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    On the effect of a spherical shield on the radiation Q and efficiency of ideal dipole antennas. / Sten, Johan C.-E. (Corresponding Author); Hujanen, Arto.

    In: Annales des télécommunications, Vol. 61, No. 5-6, 2006, p. 705-720.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - On the effect of a spherical shield on the radiation Q and efficiency of ideal dipole antennas

    AU - Sten, Johan C.-E.

    AU - Hujanen, Arto

    PY - 2006

    Y1 - 2006

    N2 - 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.

    AB - 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.

    M3 - Article

    VL - 61

    SP - 705

    EP - 720

    JO - Annales des télécommunications

    JF - Annales des télécommunications

    SN - 0003-4347

    IS - 5-6

    ER -