Minimum Q circularly polarized electrically small spherical antennas

Oleksiy S. Kim

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

The radiation problem for the TM10- and TE10-mode electric current densities on the surface of a spherical magnetic-coated PEC core is solved analytically. The combination of the electric and magnetic dipole modes reduces the radiation Q of the antenna. Moreover, with an appropriately designed magnetic-coated PEC core the stored energies of these modes balance each other making the antenna self-resonant and at the same time ensuring a perfect circularly polarized radiation. Numerical results for a practical dual-mode electrically small antenna confirm the theoretical predictions. A 4-arm spherical helix antenna with a magnetic-coated PEC core radiating both TM10 and TE10 spherical modes exhibits a perfect circular polarization in almost all directions. The antenna is self-resonant with the radiation Q being 0.67QChu, or 1.27Qdual.
Original languageEnglish
Title of host publication2011 IEEE International Symposium on Antennas and Propagation : Proceedings
PublisherIEEE
Publication date2011
Pages750-752
ISBN (Print)978-1-4244-9562-7
DOIs
Publication statusPublished - 2011
Event2011 IEEE International Symposium on Antennas and Propagation - Spokane, WA, USA
Duration: 1 Jan 2011 → …

Conference

Conference2011 IEEE International Symposium on Antennas and Propagation
CitySpokane, WA, USA
Period01/01/2011 → …

Keywords

  • Dipole antennas
  • Helical antennas
  • Magnetic resonance
  • Magnetic shielding
  • Magnetic cores
  • Coatings

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