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

Johan C.-E. Stén; Arto Hujanen

doi:10.1007/BF03219930

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

Johan C.-E. Stén^*
, Arto Hujanen

^*Corresponding author for this work

VTT (former employee or external)

Research output: Contribution to journal › Article › Scientific › peer-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 language	English
Pages (from-to)	705-720
Journal	Annales des télécommunications
Volume	61
Issue number	5-6
DOIs	https://doi.org/10.1007/BF03219930
Publication status	Published - 2006
MoE publication type	A1 Journal article-refereed

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10.1007/BF03219930

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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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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.

U2 - 10.1007/BF03219930

DO - 10.1007/BF03219930

M3 - Article

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EP - 720

JO - Annales des télécommunications

JF - Annales des télécommunications

IS - 5-6

ER -

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

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