For the selection of WLAN coverage antennas, it is recommended to select () for narrow and long areas, and it is recommended to select () for open short-distance areas.

Question

Options

• Aomnidirectional antenna; omnidirectional antenna
• Bomnidirectional antenna; directional antenna
• CDirectional Antenna; Omnidirectional Antenna
• Ddirectional antenna; directional antenna

• A
  4% (1)
• B
  4% (1)
• C
  86% (24)
• D
  7% (2)

Explanation

Option C is correct because a directional antenna concentrates its signal in a focused beam, making it ideal for narrow, elongated spaces like hallways or corridors where coverage is needed along a single axis - placing it at one end can cover the entire length efficiently. An omnidirectional antenna radiates signal equally in all directions (360°), making it the right choice for open, short-distance areas where users may be positioned anywhere around the access point.

Why distractors fail:

• A is wrong because using omnidirectional antennas in narrow/long areas wastes significant signal power broadcasting sideways into walls, reducing effective range.
• B reverses the logic - omnidirectional in a corridor underperforms, and directional in an open area creates coverage dead zones for users outside the beam.
• D is wrong because a directional antenna in an open area leaves most surrounding users with poor or no signal, since coverage is only strong within its narrow beam angle.

Memory tip: Think "direction matches shape" - a narrow, long area has a clear direction, so use a directional antenna; an open, round area has no single direction, so use an omni (all-direction) antenna.

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