Wifi Signal

How can a wifi signal pass through the concrete wall as I can see my neighbor's wifi few floors above me ? Will the signal be absorbed,or in fact I receive the signal through reflection ?

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Iamthecreator OMIT Admin/EE Solution GuideCommented:
Wi-fi uses Radio signal that can pass through walls and obstructions like you can listen to radio in your home or car but it does weaken.
Iamthecreator OMIT Admin/EE Solution GuideCommented:
WiFi signals are in the microwave range. While they will be absorbed and attenuated to a varying degree, they can pass through most non-metallic building materials. Still, a couple of floors' worth of concrete is usually enough to make the signal unusable, but it might be detectable.
ReeceICT ConsultantCommented:
nice link Rahul.

Is the wall concrete or brick rendered?   A concrete wall will have reinforcing steel - a brick wall will not.  This is why wifi signals seem to pass through some walls but not floors when both appear to be concrete...  the reinforcing steel will significantly impede wifi signal.  Think of a partial Faradays Cage.  Some more modern houses with steel frame and plaster instead of timber frame also have this issue.

Other inhibitors include large fridges, large tv's, ducted aircon, wall mounted washer/dryers and other large metal objects.

There are other factors that will determine the router's broadcasting effectiveness too...   how close to the ground the router is (the wave amplitude can be 'cut' in half - so manufacturers recommend mounting at about chest or head height); other radio devices (cordless telephones, microwaves, neighbouring wifi's etc.); and much more.

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