Mimosa Backhaul Help Content
Mimosa Backhaul White Papers & Application Notes
Copyright © 2014 Mimosa Page 232
Up to 40% of the first Fresnel zone can be obstructed without significant performance impact. Once obstructions are
within the center 60%, results are...shall we say, predictably bad. If the trees in the example below are expected to
grow, you would need to take into account their growth rates and future impact on performance.
If your link is long enough, the curvature of the earth can even impair the Fresnel zone. This surprises a lot of
people, but it shouldn't after reading this article. The solution: increase antenna height.
Knowing that clear LOS is important to link performance, you will want to calculate the Fresnel zone radius and
compare it with any expected obstructions. The radius (r) of any point (P) along the link can be calculated if you
know the distance (D) and the frequency (or wavelength).
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