Appendix B Wireless LANs
DMA-1000 Series User’s Guide
91
Figure 45
Infrastructure WLAN
Antenna Overview
An antenna couples RF signals onto air. A transmitter within a wireless device sends an RF
signal to the antenna, which propagates the signal through the air. The antenna also operates in
reverse by capturing RF signals from the air.
Positioning the antennas properly increases the range and coverage area of a wireless LAN.
Antenna Characteristics
Frequency
An antenna in the frequency of 2.4GHz (IEEE 802.11b) or 5GHz(IEEE 802.11a) is needed to
communicate efficiently in a wireless LAN.
Radiation Pattern
A radiation pattern is a diagram that allows you to visualize the shape of the antenna’s
coverage area.
Antenna Gain
Antenna gain, measured in dB (decibel), is the increase in coverage within the RF beam width.
Higher antenna gain improves the range of the signal for better communications.
For an indoor site, each 1 dB increase in antenna gain results in a range increase of
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Страница 70: ...Chapter 9 Configuring the DMA DMA 1000 Series User s Guide 70 ...
Страница 78: ...Chapter 11 Troubleshooting DMA 1000 Series User s Guide 78 ...
Страница 88: ...Appendix A Product Specifications DMA 1000 Series User s Guide 88 ...
Страница 114: ...Appendix C Setting up Your Computer s IP Address DMA 1000 Series User s Guide 114 ...
Страница 182: ...Appendix G Legal Information DMA 1000 Series User s Guide 182 ...
Страница 192: ...Index DMA 1000 Series User s Guide 192 ...