Radiation Q of a small antenna enclosed in an oblate spheroidal volume: Transverse-to-axis polarisation

Johan Stén

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

Radiation quality factor, Q, of an electrically small lossless structure that fits an oblate spheroidal volume for transverse-to-axis polarisation is investigated. Q is evaluated for different size and shape of a spheroid by integrating numerically the stored energy associated with radiation. It is found that Q depends on the distribution of power amongst the various spheroidal modes, and a minimum of Q is achieved by suitable optimisation of the relative amplitudes of these modes. A graphical comparison between the minimum Q of a transversally polarised oblate and an axially polarised prolate spheroid is provided for ellipticities in the range 0.2,…,1. The inverse of the obtained minimum Q serves as an estimate for the bandwidth potential of an arbitrary, linearly polarised lossless radiator inside that volume.
Original languageEnglish
Pages (from-to)201-205
JournalAEÜ: International Journal of Electronics and Communications
Volume57
Issue number3
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

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