February 2003
Intermediate to advanced
352 pages
8h 35m
English
Content preview from Deploying License-Free Wireless Wide-Area Networks
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
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.