Theory and Experiment of UWB Archimedean Conformal Spiral Antennas

Javad Meiguni*, David Pommerenke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A conformal UWB Archimedean spiral antenna on a dielectric hemisphere is theoretically and experimentally investigated. The analysis method, design, and optimization of this type of spherical antennas is performed using an efficient spatial domain method of moments in conjunction with triangular basis functions and asymptotic Green's functions. A special conformal mapping is used to enhance the impedance bandwidth and axial ratio (AR) bandwidth for a circularly polarized spherical spiral antenna. Emphasis is given to the efficient asymptotic approach in spherical multilayered media. To validate the theory, a UWB leaky-wave conformal spiral antenna was designed, manufactured, and tested. The measured results indicate a pretty wideband behavior for this antenna starting from 1.7 to 6 GHz (1.8 octaves) in its input impedance responses. The circular polarization is maintained over 1.26 octave with less than 3 dB AR.

Original languageEnglish
Article number8753658
Pages (from-to)6371-6377
Number of pages7
JournalIEEE Transactions on Antennas and Propagation
Issue number10
Publication statusPublished - 1 Oct 2019
Externally publishedYes


  • Conformal mapping
  • dyadic Green's functions (DGFs)
  • method of moments (MoMs)
  • UWB conformal spiral antenna

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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