February 2003
Intermediate to advanced
352 pages
8h 35m
English
Content preview from Deploying License-Free Wireless Wide-Area NetworksBecome 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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Antenna Characteristics
Antennas are the most important part of every wireless WAN. Every WAN covers a wide area. Without an antenna, wireless power travels only a short distance, perhaps a few dozen feet. To successfully deploy license-free wireless WANs, you need to understand the key concepts of antenna directivity and antenna gain.
Antenna Directivity
Antennas radiate wireless power—that is, antennas accept wireless signal energy from the transmission line connected to a transmitter and launch that wireless energy into free space. Antennas focus the wireless energy like a flashlight reflector focuses the light from the flashlight bulb. Figure 2-14 compares the energy radiated from a bare, unfocused flashlight bulb to the focused energy radiated ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.