Antena difference

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jeff.kish Thu, 12/24/2009 - 06:19
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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.

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).

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.

Also, see this document:

Look about 2-3 pages down until you see the section called "Type of Antennas".


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