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1

First, the router power will be +20 or +22 dBm. Subtract a few dB on the way to the antenna, more if it's an internal antenna. Second, the free space path loss will be at least 20 dB, from phone to router, a few cm apart. This means that even held close by, the phone antenna only captures 1% of the transmitted signal. This will be made worse by the ...


2

A Wi-Fi transmitter, like a lightbulb, throws out photons in a lot of directions. Only some of them will be captured by the receiver. Most will go elsewhere, eventually being absorbed by walls, atmospheric water vapor, and so on to be converted to heat. The Friis transmission equation explains this in more rigorous terms. Even if the two antennas are ...


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I can think of a few reasons why your WiFi signal strength is 45 dB down from what your router's documentation suggests. Your phone and antenna aren't calibrated. Your app makes signal strength estimates using a guess about what kind of phone and antenna you're using, but that's just a guess: mobile phone handsets' WiFi antennas vary widely, and the ...


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