User Manual

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2009 Industrial Wireless Guidebook
Understanding Industrial WLAN – IEEE 802.11
2
• Uni-directional antennas have beams with narrow horizontal and vertical angles. Uni-directional antennas
are mainly used on rooftops or masts for establishing point-to-point links that interconnect areas of a
network that are separated by a distance.
External Antennas
Moxa’s 802.11a/b/g/n wireless AP/bridge/client devices are supplied with a low gain antenna. However,
for many of the long range applications, additional external antennas are necessary to extend the wireless
range. The following sections contain a brief description of the two types of antennas:
• Omni-directional antennas transmit horizontally with equal power in all directions. They have very limited
vertical spread, which determines the antenna gain. Antennas of this type are typically located in the
center of open spaces or larger offices to provide even coverage to all clients.
E-Plane
E-Plane H-Plane Directional / Panel
Antenna
H-Plane
Fiberglass Antenna Dipole Antenna