In a WLAN network, when deploying APs with external antennas, the antenna signal coverage range can be controlled by adjusting the antenna azimuth and downtilt angle. Which of the following angles…

Question

Options

• AThe angle formed by the antenna pattern at 3db below the main lobe peak
• BThe angle formed by rotating clockwise from the north to the direction of the antenna main lobe
• CThe angle between the antenna main lobe direction and the horizontal plane
• DThe angle formed by rotating counterclockwise from the north to the main lobe direction of the

• B
  5% (1)
• C
  86% (19)
• D
  9% (2)

Explanation

Downtilt angle refers specifically to the vertical tilt of an antenna's main lobe relative to the horizontal plane (option C). When an antenna is mounted on a tower or wall, engineers tilt it downward to focus coverage on a target area below; the angle between that main lobe direction and the true horizontal is the downtilt angle - tilting it more steeply increases the angle.

Why the distractors are wrong:

• A describes the beamwidth (half-power or 3 dB beamwidth), which measures how wide the beam is, not its vertical tilt direction.
• B describes the azimuth angle - a horizontal compass bearing measured clockwise from north - which controls the horizontal direction the antenna faces, not its vertical tilt.
• D also describes an azimuth-like concept (counterclockwise rotation from north), still a horizontal measurement, not vertical.

Memory tip: Think of "downtilt" literally - it's how far the antenna is tilted down from flat/horizontal. If you hold your arm straight out horizontally and then angle it downward, the angle your arm makes with the floor is the downtilt angle. Azimuth = which direction you're pointing (compass); downtilt = how far down you're pointing (vertical).

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