April 2004
Beginner
312 pages
8h 23m
English
Content preview from Absolute Beginner's Guide to Wi-Fi® Wireless NetworkingBecome 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,
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Different Kinds of Antennas
There are many different designs for antennas that Wi-Fi cards and access points can use.
Generally, antennas are either omnidirectional or directional.
Omnidirectional Antennas
Omnidirectional antennas are most commonly used with Wi-Fi cards and access points. These antennas send out radio waves in all directions equally on the horizontal plane but don't send out much in the way of signals vertically. The radiation pattern of an omnidirectional antenna looks like a doughnut, with the antenna in the center of the doughnut, as depicted in Figure 17.1.
Figure 17.2 shows a fairly standard omnidirectional antenna made by Maxrad, Inc., which is intended to work with Wi-Fi and the 2.4GHz spectrum, and is mounted externally ...
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