### 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 |
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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

Sten, J. C-E., & Hujanen, A. (2006). On the effect of a spherical shield on the radiation Q and efficiency of ideal dipole antennas.

*Annales des télécommunications*,*61*(5-6), 705-720.