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 -