Minimum Q Electrically Small Spherical Magnetic Dipole Antenna - Theory

Olav Breinbjerg, Oleksiy S. Kim

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Abstract

The stored energies, radiated power, and quality factor of a magnetic-dipole antenna, consisting of a spherical electrical surface current density enclosing a magnetic core, is obtained through direct spatial integration of the internally and externally radiated field expressed in terms of spherical vector waves. The obtained quality factor agrees with that of Wheeler and Thal for vanishing free-space electric radius but holds also for larger radii and facilitates the optimal choice of permeability in the presence of the resonances.
Original languageEnglish
Title of host publication2009 International Symposium on Antennas and Propagation (ISAP 2009)
Place of PublicationBangkok, Thailand
Publication date2009
Pages695-698
ISBN (Print)978-974-235-465-7
Publication statusPublished - 2009
Event2009 International Symposium on Antennas and Propagation - Bangkok, Thailand
Duration: 20 Oct 200923 Oct 2009

Conference

Conference2009 International Symposium on Antennas and Propagation
CountryThailand
CityBangkok
Period20/10/200923/10/2009

Keywords

  • quality factor
  • Chu limit
  • Electrically small antennas
  • lower bound
  • magnetic dipole

Cite this

Breinbjerg, O., & Kim, O. S. (2009). Minimum Q Electrically Small Spherical Magnetic Dipole Antenna - Theory. In 2009 International Symposium on Antennas and Propagation (ISAP 2009) (pp. 695-698).