### Abstract

Original language | English |
---|---|

Pages (from-to) | 705-720 |

Number of pages | 16 |

Journal | Annales des télécommunications |

Volume | 61 |

Issue number | 5-6 |

Publication status | Published - 2006 |

MoE publication type | A1 Journal article-refereed |

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### Cite this

*Annales des télécommunications*,

*61*(5-6), 705-720.

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*Annales des télécommunications*, vol. 61, no. 5-6, pp. 705-720.

**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.

Research output: Contribution to journal › Article › Scientific › peer-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 -