Journal article
Electric Dipole Antennas With Magnetic-Coated PEC Cores: Reaching the Chu Lower Bound on Q
The radiation properties of spherical electric dipole antennas with electric current excitation and material-coated perfectly electrically conducting (PEC) cores are investigated analytically using vector spherical wave functions. Closed-form expressions for electric and magnetic stored energy as well as the radiation quality factor $Q$ are derived.
Using these, it is shown that properly selected magnetic coating and radius of the PEC core vastly reduce the internal stored energy, and thus make the $Q$ of an electric dipole antenna approach the Chu lower bound.
| Language: | English |
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| Publisher: | IEEE |
| Year: | 2012 |
| Pages: | 1616-1619 |
| ISSN: | 15582221 and 0018926x |
| Types: | Journal article |
| DOI: | 10.1109/TAP.2011.2180331 |
| ORCIDs: | Kim, Oleksiy S. |
Chu Lower bound Chu lower bound Dipole antennas Magnetic cores Magnetic resonance PEC core radius Permeability Q factor Q-factor antenna radiation patterns dipole antennas electric current excitation electric dipole electric stored energy electrically small antennas fundamental limitations magnetic stored energy magnetic-coated PEC cores material-coated perfectly-electrically-conducting cores quality factor radiation properties radiation quality factor spherical electric dipole antennas vector spherical wave functions
