12-24-2009 04:53 AM - edited 07-03-2021 06:22 PM
Hello!
what is the difference between:
1)Yagi antena
2)Dipole antena
3)omni antena
Thanks to all
12-24-2009 06:19 AM
Yagi Antenna: A directional antenna, meant to propagate signal in a specific direction rather than to spread it all around. These are commonly used in bridging applications, where two wireless bridges are separated by a great distance and direct their signals at each other to establish a point-to-point link. Yagi antennas are generally stronger than patch antennas, which are a different kind of directional antenna.
http://en.wikipedia.org/wiki/Yagi_antenna
Omni Antenna: An antenna that covers 360° around itself, providing service to all clients in an area. These are almost always used when supplying coverage to clients, but they can also be used in point-to-multipoint bridging applications. The coverage is not a sphere, but looks more like a donut, with coverage 'gaps' directly above and below the antenna (assuming it's oriented vertically).
http://en.wikipedia.org/wiki/Omnidirectional_antenna#Short_dipole
Dipole Antenna: This is essentially an omnidirectional antenna, but it's commonly referred to in wireless as a refrence point to relate other antennas. The reference point is supposedly a theoretically perfect antenna, with signal being generated from a single point in space with a perfectly spherical coverage. Since it's theoretical, this kind of antenna doesn't exist, but all real antennas can be compared against this and given a value.
http://en.wikipedia.org/wiki/Dipole_antenna#Dipole_as_a_reference_standard
Also, see this document: http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/product_data_sheet09186a008008883b.html
Look about 2-3 pages down until you see the section called "Type of Antennas".
12-25-2009 09:30 AM
thanks
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