Conference paper
Radiation quality factor of spherical antennas with material cores
This paper gives a description of the radiation quality factor and resonances of spherical antennas with material cores. Conditions for cavity and radiating resonances are given, and a theoretical description of the radiation quality factor, as well as simple expressions describing the relative increase in quality factor due to the effect of the internally stored energy are given in special cases.
For the air-core antenna of vanishing size, it is shown that the dipole modes are the modes providing the lowest quality factor of all modes. Finally an investigation of the effect of the core permeability and permittivity for an antenna of fixed electrical size is performed.
| Language: | English |
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| Publisher: | IEEE Computer Society Press |
| Year: | 2011 |
| Pages: | 419-423 |
| Proceedings: | 5th European Conference on Antennas and Propagation |
| ISBN: | 1457702509 , 9781457702501 , 8882020746 and 9788882020743 |
| Types: | Conference paper |
| ORCIDs: | Kim, Oleksiy S. and Breinbjerg, Olav |
Cavity resonators Dipole antennas Magnetic cores Materials Q factor Q-factor air-core antenna antenna radiation patterns cavity resonance cavity resonators core permeability core permittivity dipole antennas dipole modes internally stored energy material cores permeability permittivity radiating resonance radiation quality factor spherical antennas
