How do Wi-Fi Signals travel through walls and obstacles?
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It’s radiation. “Electromagnetic radiation” includes everything from radio, infrared (heat), light, xrays, cosmic rays. Just all of it.
Everything is various levels of transparent or opaque to all the different frequencies of radiation. Just like we have glass which light passes right through, most walls are mostly transparent to wifi signals.
Most things are mostly transparent to xrays, they wiggle so fast that they can slip through. It’s literally a matter of how dense the matter is, so the gaps between are so small, the wavelength doesn’t fit through.
Walls are wood, drywall, plaster, paint, brick, concrete, wire-mesh. Wood and drywall are mostly transparent to wifi. Lathe and plaster houses have wire-mesh holding the plaster in place and that metal wire (and the size of the holes) is opaque to wifi and it’s a real bear for devices. They need repeaters in different rooms.
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