My understanding of inductive coupling is that it isn't feasible over long distances because the spread of the magnetic field lines happens rapidly, so not much flux will go through the receiver coil if it's too far apart (not a physicist, this may not be exactly right).
However, if an entire room was a coil (imagine in the walls), anything inside of the room would be by definition exposed to nearly the maximum flux possible (relative to the size of that coil).
Would this be a feasible way to have wireless power throughout a room?
Reasons I could see this not working that I'm not sophisticated enough to evaluate:
- Too much power required for the transmitter coil (expensive and/or problematic magnetic field strength)
- Too little flux for receiver without also being pretty large
- Interference with other devices/Wi-fi in the room that are worse than the benefits
- Angle of receiver being too dynamic would mitigate power benefits unless stationary to align axes