Omnidirectional Antenna: Difference between revisions
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== | == Horizontally Polarized Omnidirectional Antennas == | ||
* [http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=7505 Halo] The simplest form - a dipole bent into a circular shape. | * [http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=7505 Halo] The simplest form - a dipole bent into a circular shape. | ||
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* [http://www.wimo.de/cgi-bin/verteiler.pl?url=big-wheel-antennas_e.html Big Wheel] More elaborate. Mainly used on VHF and UHF. | * [http://www.wimo.de/cgi-bin/verteiler.pl?url=big-wheel-antennas_e.html Big Wheel] More elaborate. Mainly used on VHF and UHF. | ||
== | == Circularly Polarized Omnidirectional Antennas == | ||
* [http://www.qsl.net/g4hbt/dipole.htm Turnstile] Often used for satellite communications. | * [http://www.qsl.net/g4hbt/dipole.htm Turnstile] Often used for satellite communications. | ||
== | == Verticallly Polarized Omnidirectional Antennas == | ||
All vertical antennas with a single element are omnidirectional radiators. | All vertical antennas with a single element are omnidirectional radiators. | ||
Revision as of 05:50, 6 June 2009
Horizontally Polarized Omnidirectional Antennas
- Halo The simplest form - a dipole bent into a circular shape.
- Big Wheel More elaborate. Mainly used on VHF and UHF.
Circularly Polarized Omnidirectional Antennas
- Turnstile Often used for satellite communications.
Verticallly Polarized Omnidirectional Antennas
All vertical antennas with a single element are omnidirectional radiators.
| Antennas | |
| Design | Beam * Dipole * Dish or Parabola * DDRR * Log Periodic (LPDA) * Loop * Mobile and portable * Omnidirectional * Panel * Quad and Quagi * Screwdriver * Small tuned loop * Vertical * Yagi-Uda * Wire and random wire antennas |
| Installation | Antenna Tuners * Capacity hats and loading coils * Cavity filters * Coaxial Cable * Feedlines * Rotators * Towers and Masts * VK2ACY - G5RV coupler |
| Theory | Front-to-back ratio * Impedance matching * SWR * Tower design * Vertical Antenna efficiency * Wire comparison tables |