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300-425 · Question #318

A warehouse has metal shelving that reflects RF signals. Which antenna strategy is best?

The correct answer is B. Low-gain directional antennas mounted on the aisles. In high-multipath environments with metal shelving, directional antennas aimed down aisles reduce reflections and provide controlled, predictable coverage.

Wireless Design

Question

A warehouse has metal shelving that reflects RF signals. Which antenna strategy is best?

Options

  • ACeiling-mounted omni-directional antennas only
  • BLow-gain directional antennas mounted on the aisles
  • CAPs installed randomly throughout the warehouse
  • DHigh-gain Yagi antennas pointing across shelves

How the community answered

(16 responses)
  • A
    6% (1)
  • B
    81% (13)
  • D
    13% (2)

Why each option

In high-multipath environments with metal shelving, directional antennas aimed down aisles reduce reflections and provide controlled, predictable coverage.

ACeiling-mounted omni-directional antennas only

Ceiling-mounted omni-directional antennas radiate in all directions, maximizing signal reflection off metal shelving and creating severe multipath interference throughout the space.

BLow-gain directional antennas mounted on the aislesCorrect

Low-gain directional antennas mounted at aisle level focus RF energy along the corridor, minimizing reflections off metal shelving. This reduces multipath interference and delivers consistent coverage without the excess signal bouncing that wider-pattern antennas would produce in a metal-dense warehouse environment.

CAPs installed randomly throughout the warehouse

Random AP placement ignores the structured RF propagation challenges introduced by metal shelving and results in unpredictable coverage gaps and interference hotspots.

DHigh-gain Yagi antennas pointing across shelves

High-gain Yagi antennas pointed across shelves fire directly into metal surfaces, causing extreme reflections and overpowering nearby receivers with multipath-corrupted signals.

Concept tested: Antenna selection for high-multipath warehouse RF environments

Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/WiFiDesignGuide/WiFiDesgnGuide.html

Topics

#warehouse deployment#RF reflection#directional antennas#aisle coverage

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