OMNI-DIRECTIONAL DIPOLE ANTENNAS Antennas Pages Directory
Bigger is not always better:
Optimal choice of
dipole antenna is determined by the relative positions of the access point and the clients, and range.
Omni-directional
antennas pickup stray "interference" signals that can degrade performance. To send/receive a signal in a particular direction, use a
directional antenna.
KEY POINTS
2dbi - Best if relative-positioning is on different elevations: Such as different floors of a building.
5dbi - If you wish to send your signal over a couple of levels of a building, a 5dbi dipole is more recommendable.
7dbi - Optimal balance between range and elevation
9dbi - Best if distance is long and AP and client are on the same elevation (horizontal plane)
The receiving end must be in the wave-path of the antenna:
Below: Dipole Wave Pattern of 2dbi, 5dbi, 7dbi, 9dbi:
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RIGHT: A 9dB antenna can be seen at 4-5 times the distance of the 2dB antenna but it can only be seen within 5 feet of its horizontal beam path.
Think of the wireless radiation pattern as a fat donut with the antenna sticking through the middle of the donut. As the gain of the antenna is increased the fat donut starts to flatten out significantly to the point where you will have a donut so flat it will resemble a CD disk: Round but very flat and anything above it or below its path won't see it.
At left: Radiation pattern of the 2dB omnidirectional antenna at right (bottom pattern in image)
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Diagram below shows the radiation pattern of a 2dBi omni-directional dipole antenna (vertically polarized):
This diagram shows the relationship between the E and H planes for a
vertically polarized omni-directional dipole antenna
This is the type used in wireless repeater systems and it is intended for
short range meshed networks and reaches everyone
within its range.
Polarization of the wireless antenna is the orientation of
the wireless signal. It can be vertical, horizontal, circular or combinations
of these.
The E-plane and H-plane are reference planes for linearly polarized antenna.
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