Руководство По Проектированию для Cisco Cisco Aironet 350 Mini-PCI Wireless LAN Client Adapter
3-22
Enterprise Mobility 4.1 Design Guide
OL-14435-01
Chapter 3 WLAN Radio Frequency Design Considerations
Planning for RF Deployment
Figure 3-10
Omni-Directional RF Pattern
Looking at the pattern in
, this may be the incorrect antenna to use on a wall, especially if it
is mounted along an exterior wall where the pattern can radiate outside of the building. This can open
up the wireless network to hackers outside the building and compromise the wireless network.
up the wireless network to hackers outside the building and compromise the wireless network.
Patch Antennas
The patch antenna is a type of directional antenna. Patch antennas not only radiate away from the wall
or place where they are mounted, but also have rear and side lobes that produce a weakened but still
potentially useful RF region.
or place where they are mounted, but also have rear and side lobes that produce a weakened but still
potentially useful RF region.
shows the real horizontal pattern of a diversity patch wall
mount antenna. Although most of the coverage area is in front of the patch antenna, notice the back and
side RF pattern from the center area. Again, antenna selection is important because it defines the
radiation pattern and where wireless connectivity is possible.
side RF pattern from the center area. Again, antenna selection is important because it defines the
radiation pattern and where wireless connectivity is possible.
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Vertical
Horizontal