What is a "Wifi Attenuation Chart"? The Most Authoritative Explanation.

What is a "Wifi Attenuation Chart"? The Most Authoritative Explanation.

What is wall attenuation?

Wall attenuation is the absorption of radio frequency signals by wall materials. The higher the attenuation, the weaker the Wi-Fi signal after it passes through the wall. Drywall typically reduces the signal strength by 3dB. Large concrete pillars can stop a Wi-Fi signal in its tracks!

How do you measure wall attenuation with a Wi-Fi radio?

The Wi-Fi radio should ideally be positioned perpendicular to the wall. To measure wall attenuation, you need to measure Wi-Fi signal strength (RSSI) from a Wi-Fi radio using Ekahau Sidekick on both sides of the wall and then calculate the difference between these measurements.

What is attenuation in a pre-design survey?

In this blog, we will focus on one part of a Pre-Design Survey — measuring the attenuation of walls. Wall attenuation is the absorption of radio frequency signals by wall materials. The higher the attenuation, the weaker the Wi-Fi signal after it passes through the wall. Drywall typically reduces the signal strength by 3dB.

Which material has the greatest signal attenuation?

Shockingly, concrete yields the greatest signal attenuation both with and without reinforcement as compared against the other tested materials. Apparently, NIST did not have an elevator shaft wall handy on testing day. According to this data, plywood and drywall (panel) have almost zero (well, less than 1dB) effect on signal loss.

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