Diffraction
Diffraction of a wireless signal occurs when the signal is partially blocked or obstructed by a large object in the signal's path, as shown in Figure 2-9.
Figure 2-9. Signal Diffraction Around an Obstruction
The edge of the hill partially blocks the microwave signal. As the bottom part of the signal intercepts the hilltop, the signal is diffracted, causing part of the signal energy to bend slightly around the hilltop.
The diffracted signal energy is usually attenuated so much that it is too weak to provide a reliable microwave connection. In a few cases, however, the diffracted signal, although weakened, might still be strong enough ...
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