Allied Telesis AT-WL2411 - Manual (Page 6)

Radiation Patters of Various Antennas
Omnidirectional:
Circular patter in open spaces
Range is slightly effected by antenna gain but the radiation pattern will
remain relatively circular.
Flat Panel:
Modest directional coverage with a slight backlobe
The main lobe of the radiation pattern can be from almost circular to fairly
oblong in shape. Good for slightly directional coverage such as down
corridor or away from walls.
Dual Flat Panel:
Bi-directional coverage
Good for transmission down two opposing directions of a corridor.
Directional YAGI (High Gain):
Highly focused signal.
Good for wireless bridging or very specialized coverage.
There must always be a tradeoff between gain and coverage area. As can be
seen in the radiation patterns presented, the higher the gain (directional
distance) as with the Yagi antenna, the narrower the coverage. And
conversely, the lower the gain, the more universal the coverage about the
antenna's axis.
Antenna patterns are 3
dimensional. The radiation
patterns (above) are views
of the azimuth plain, which
is a top down view.
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PN 613-50537-00 Rev A
6