300-360 · Question #178
What RF phenomenon results from a presence of metallic I-beams, conveyor belts, chain-link fences, and metallic shelves found in a warehousing environment?
The correct answer is D. multipath. Multipath is the RF phenomenon caused when signals reflect off metallic objects - I-beams, conveyor belts, chain-link fences, and metal shelving - and arrive at the receiver via multiple paths at slightly different times. These delayed copies of the signal can cause intersymbol…
Question
What RF phenomenon results from a presence of metallic I-beams, conveyor belts, chain-link fences, and metallic shelves found in a warehousing environment?
Options
- Ascattering
- Babsorption
- Cfree path loss
- Dmultipath
How the community answered
(37 responses)- A3% (1)
- C3% (1)
- D95% (35)
Explanation
Multipath is the RF phenomenon caused when signals reflect off metallic objects - I-beams, conveyor belts, chain-link fences, and metal shelving - and arrive at the receiver via multiple paths at slightly different times. These delayed copies of the signal can cause intersymbol interference, signal cancellation (nulls), or constructive/destructive fading. Warehouses are classic multipath environments due to the abundance of large, flat metallic surfaces. Scattering occurs when signals hit rough or irregular surfaces. Absorption reduces signal strength. Free path loss is the natural attenuation of signal over distance in open air.
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