Conference paper
Minimum Q circularly polarized electrically small spherical antennas
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.
Language: | English |
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Publisher: | IEEE |
Year: | 2011 |
Pages: | 750-752 |
Proceedings: | 2011 IEEE International Symposium on Antennas and Propagation |
Journal subtitle: | Proceedings |
ISBN: | 1424495628 and 9781424495627 |
Types: | Conference paper |
DOI: | 10.1109/APS.2011.5996821 |
ORCIDs: | Kim, Oleksiy S. |