Obstacles Causing Wi-Fi Signal Attenuation
Main causes of signal attenuation are metal objects, walls (especially load-bearing ones), and large furniture or appliances.
The empirical values of penetration loss of 2.4G electromagnetic waves through various building materials are as follows:
Table 1-2
Material | Penetration Loss |
|---|---|
Reinforced concrete partition wall (load-bearing wall) | 20–40 dB |
Floor | 30 dB |
Concrete wall | 10–18 dB |
Hollow brick wall | 4–6 dB |
Simple gypsum panel wall | 3–5 dB |
Common glass doors and windows | 2–4 dB |
Wooden door | 3–5 dB |
Coated glass doors and windows | 12–15 dB |
Wooden furniture, doors, and other wooden partitions | 2–15 dB |
Metal object Water | Total reflection Full absorption |
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