I know this might be far fetched. In normal everyday life, we have huge amounts of data traveling through the air in the form of electromagnetic radiation. But what if instead of transmitter data through this channel we instead transmit low energy power. Where by at the receiver side we use the antenna or a custom built transducer that will be able to convert this transmitted power into a clean 5V DC voltage. Is this even feasible?
Propagation of electromagnetic waves through the air has relatively high loss and thus bad efficiency. E.g. at 2.4GHz and 1m distance, power loss is factor 1:10‘000 (isotropic antenna model).
That is not a big problem for signal transmission, but it is a huge problem for energy transmission.