CWNA: Certified Wireless Network Administrator v108 — Question 35

What statement about the beamwidth of an RF antenna is true?

Answer options

• A. Horizontal and vertical beamwidth are calculated at the points where the main lobe decreases power by 3 dB.
• B. The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.
• C. When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.
• D. Vertical beamwidth is displayed (in degrees) on the antenna's Azimuth chart.

Correct answer: A

Explanation

Option A is correct because beamwidth is indeed defined at the points where the main lobe's power drops by 3 dB. Option B is incorrect as the polar chart shows beamwidth but not the cessation of signal propagation. Option C is misleading since a lower gain typically results in a wider beamwidth, not a narrower one. Option D is false because vertical beamwidth is typically represented on the Elevation chart, not the Azimuth chart.