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Wireless Glossary
Antenna Beamwidth
Antenna beamwidth is the peak-to-peak angle overlaying the maximum gain beam of the antenna at which its gain is reduced by 3 dB. Contrary to popular belief, the 3 dB gain beam-width of an antenna does not represent its interference beam-width, which is significantly wider. For example, a typical 2-foot parabolic antenna at 5.8 GHz has 28 dBi of gain, and a typical beam-width of 6 degrees. However, as an interference source, it radiates with 25 dBi of gain over a 6 degree area, 10 dBi of gain over a 32 degree area, and 2 dBi gain over a 170 degree area.
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