Abstract
An electrically small circularly polarized self-resonant spherical antenna with air core is presented. The antenna is a modified multiarm spherical helix exciting TM10 and TE10 spherical modes with equal radiated power, and thus yielding perfect circular polarization over the entire far-field sphere (except the polar regions, where the radiation is low). The self-resonance is achieved by exciting higher-order TM modes, which provide the necessary electric stored energy in the near-field, while contributing negligibly to the far-field radiation of the antenna. The antenna has electrical size ka = 0.254, and its radiation quality factor Q is 1.76 times the Chu lower bound.
| Original language | English |
|---|---|
| Title of host publication | 2013 7th European Conference on Antennas and Propagation |
| Publisher | IEEE |
| Publication date | 2013 |
| Pages | 233-236 |
| ISBN (Print) | 978-1-4673-2187-7 |
| Publication status | Published - 2013 |
| Event | 7th European Conference on Antennas and Propagation - Swedish Exhibition and Congress Centre, Gothenburg, Sweden Duration: 8 Apr 2013 → 12 Apr 2013 Conference number: 7 https://www.eucap2013.org/ |
Conference
| Conference | 7th European Conference on Antennas and Propagation |
|---|---|
| Number | 7 |
| Location | Swedish Exhibition and Congress Centre |
| Country/Territory | Sweden |
| City | Gothenburg |
| Period | 08/04/2013 → 12/04/2013 |
| Internet address |
Keywords
- Electrically small antenna
- Q-factor
- Cirkular polarization