User`s guide

Planning and Installing Wireless LANS
BreezeNET PRO.11 Series
5-13
User’s Guide
5.2.2 Antennas for Indoor Applications
For most indoor applications, the best choice is the standard unit equipped with its
integrated 2dBi antennas. The units are small, easy to install and cover a large area.
In some installations, it is required to install the unit and antenna separately. In such
instances, use the AP-10D with the omni-6 antenna kit (6dbi omni-directional
antenna with 3 meter RG-58 cable). In the USA (FCC regulated) and in non-
regulated countries, the omni-6 comes with a shorter antenna cable, extending the
coverage area.
The Uni-8.5 is also useful in indoor applications. It is very small and easily wall-
mounted, but its radiation pattern is limited (75
°
).
BreezeCOM recommends that, for indoor applications, you use two antennas per
unit to utilize the diversity gain of the system.
5.2.2.1 Antenna Diversity
In applications where no multipath propagation is expected, a single antenna is
sufficient to ensure good performance levels. However, in cases where multipath
propagation exists, BreezeCOM recommends that two antennas be used. This takes
advantage of space diversity capabilities. By using two antennas per unit, the
system can select the best antenna on a per-packet basis (every several
milliseconds).
Multipath propagation is to be expected when there are potential reflectors between
the main and remote sites. These reflectors may be buildings or moving objects
such as airplanes and motor vehicles. If this is the case, the radio signal does not
travel in a straight line, but is reflected or deflected off of the object, creating
multiple propagation paths.
When installing a single antenna, modify the transmit diversity option to either
antenna 1 or antenna 2, according to the antenna being used (refer to Section 3.4.3).