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Question 27 - CWNA-109 discussion

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

A.
Horizontal and vertical beamwidth are calculated at the points where the main lobe decreases power by 3 dB.
Answers
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.
Answers
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.
Answers
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.
Answers
D.
Vertical beamwidth is displayed (in degrees) on the antenna's Azimuth chart.
Suggested answer: A

Explanation:

The beamwidth of an RF antenna is the angular measure of how wide the main lobe of radiation is. The main lobe is the area where the signal strength is highest and most concentrated. The beamwidth is calculated at the points where the main lobe decreases power by 3 dB, which means it is half of the maximum power. The beamwidth can be measured in both horizontal and vertical planes, depending on how the antenna is oriented. The horizontal beamwidth is also called azimuth, while the vertical beamwidth is also called elevation.The beamwidth patterns on an antenna polar chart indicate how the RF energy is distributed in different directions.Reference:1, Chapter 2, page 66;2, Section 2.3

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asked 16/09/2024
John Gevers
26 questions
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