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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