Difference between revisions of "Antennas"
(New page: =Types of Antennas= ==Omnidirectional antenna== ==Directional antenna== *DirectionalBiQuad *DirectionalParabolic *DirectionalPatch *DirectionalSector *DirectionalWaveguide *DirectionalY...) |
|||
| Line 2: | Line 2: | ||
==Omnidirectional antenna== | ==Omnidirectional antenna== | ||
| + | An omnidirectional antenna is an antenna system which radiates power uniformly in one plane with a directive pattern shape in a perpendicular plane. This pattern is often described as "donut shaped" | ||
| + | |||
==Directional antenna== | ==Directional antenna== | ||
*DirectionalBiQuad | *DirectionalBiQuad | ||
| + | BiQuad antennas are normally homebrew antennas. They are designed to work on the 802.11b standard wifi links. Their typical gain is 8-10 dBi. | ||
| + | |||
| + | |||
*DirectionalParabolic | *DirectionalParabolic | ||
| + | A parabolic antenna is a high-gain reflector antenna. It typically consists of a parabolic reflector with a small feed antenna at its focus. The reflector is a metallic surface formed into a paraboloid of revolution and (usually) truncated in a circular rim that forms the diameter of the antenna. This paraboloid possesses a distinct focal point by virtue of having the reflective property of parabolas in that a point light source at this focus produces a parallel light beam aligned with the axis of revolution. This design adjusted for 802.11b,g (2.4Ghz) and 802.11a (5.8Ghz) frequencies. | ||
| + | |||
| + | Grid antennas and Dish antennas are examples of a parabolic antenna. | ||
| + | |||
| + | |||
*DirectionalPatch | *DirectionalPatch | ||
| + | A patch antenna is a popular antenna type, which gains its name from the fact that it basically consists of a metal patch suspended over a ground plane. The assembly is usually contained in a plastic radome, which protects the structure from damage (as well as concealing its essential simplicity). Patch antennas are simple to fabricate and easy to modify and customize. This design adjusted for 802.11b,g (2.4Ghz) and 802.11a (5.8Ghz) frequencies. | ||
| + | |||
| + | Patch antenna's are also widely know as (Flat) Panel Antennas. | ||
| + | |||
| + | |||
*DirectionalSector | *DirectionalSector | ||
| + | A sector antenna is a kind of directional antenna with a sector-shaped radiation pattern. They have a wide beamspread, typically 90 or 120 degrees. These antennas are typically installed in base station sites for point-to-multipoint connections. Cell companies also use this type of antenna for their network coverage. This design adjusted for 802.11b,g (2.4Ghz) and 802.11a (5.8Ghz) frequencies. | ||
| + | |||
| + | |||
*DirectionalWaveguide | *DirectionalWaveguide | ||
| + | |||
*DirectionalYagi | *DirectionalYagi | ||
Revision as of 20:50, 20 April 2009
Types of Antennas
Omnidirectional antenna
An omnidirectional antenna is an antenna system which radiates power uniformly in one plane with a directive pattern shape in a perpendicular plane. This pattern is often described as "donut shaped"
Directional antenna
- DirectionalBiQuad
BiQuad antennas are normally homebrew antennas. They are designed to work on the 802.11b standard wifi links. Their typical gain is 8-10 dBi.
- DirectionalParabolic
A parabolic antenna is a high-gain reflector antenna. It typically consists of a parabolic reflector with a small feed antenna at its focus. The reflector is a metallic surface formed into a paraboloid of revolution and (usually) truncated in a circular rim that forms the diameter of the antenna. This paraboloid possesses a distinct focal point by virtue of having the reflective property of parabolas in that a point light source at this focus produces a parallel light beam aligned with the axis of revolution. This design adjusted for 802.11b,g (2.4Ghz) and 802.11a (5.8Ghz) frequencies.
Grid antennas and Dish antennas are examples of a parabolic antenna.
- DirectionalPatch
A patch antenna is a popular antenna type, which gains its name from the fact that it basically consists of a metal patch suspended over a ground plane. The assembly is usually contained in a plastic radome, which protects the structure from damage (as well as concealing its essential simplicity). Patch antennas are simple to fabricate and easy to modify and customize. This design adjusted for 802.11b,g (2.4Ghz) and 802.11a (5.8Ghz) frequencies.
Patch antenna's are also widely know as (Flat) Panel Antennas.
- DirectionalSector
A sector antenna is a kind of directional antenna with a sector-shaped radiation pattern. They have a wide beamspread, typically 90 or 120 degrees. These antennas are typically installed in base station sites for point-to-multipoint connections. Cell companies also use this type of antenna for their network coverage. This design adjusted for 802.11b,g (2.4Ghz) and 802.11a (5.8Ghz) frequencies.
- DirectionalWaveguide
- DirectionalYagi
