Free-Space Waves
A free-space wave is a signal that propagates from Point A to Point B without encountering or coming near an obstruction, as in Figure 2-5.
Figure 2-5. Free-Space Wave
The signal arrives at its destination with as much amplitude as possible because the amplitude is not reduced by attenuation from objects. The only amplitude reduction that occurs is the normal reduction due to the signal being propagated through free space. A signal path like this, with no obstructions, is an ideal wireless scenario.
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