Determine the Outdoor Range
3-10
Outdoor Antenna Installation Guide
Figure 3-2 Fresnel Zone
If any significant part of this bulged zone is obstructed, a portion of
the radio energy will be lost, which may affect the performance of
your wireless link in terms of maximum range and/or transmit rate.
Looking at Figure 3-2 you will see two variables that determine the
shape of the radio beam, also referred to as Fresnel Zone:
a.
The distance between the antennas
b.
The clearance required for optimal performance, where
clearance should be interpreted as:
■
Vertical clearance above the ground and the highest
buildings or objects in the signal path, and
■
Horizontal clearance from neighboring buildings and
objects in the signal path.
For optimal range and throughput performance, you must ensure
that your antenna installation provides maximum clearance in both
horizontal and vertical direction.
