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Path Loss
Path loss is determined mainly by several factors:
Distance between sites – Path loss is lower and system performance
better when distances between sites are shorter.
Clearance – Path loss is minimized when there exists a clear line of
sight. The number, location, size, and makeup of obstacles determine
their contribution to path loss.
Antenna height – Path loss is lower when antennas are positioned
higher. Antenna height is the distance from the imaginary line
connecting the antennas at the two sites to ground level. Ground level in
an open area is the actual ground. In dense urban areas, ground level is
the average height of the buildings between the antenna sites.
2.3.3 Rooftop Installation
Rooftop installations offer several advantages:
Fewer obstacles in the path.
Improved performance due to greater height.
2.3.4 Antennas for Outdoor Applications
The
D-Link AirPremier DWL-1800 series can be used in point-to-point or
point-to-multipoint configurations.
Point-to-Point
The DWL-1800B/DWL-1800R is equipped with a directional antenna. The required
antenna gain depends on the required range and performance.
Point-to-Multipoint
Setting up a point-to-multipoint link requires the use of a base unit equipped with an
integrated antenna and at least two remote units also equipped with integrated
antennas.
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