Basically what the title says. Why is it that no one has come up with a solution to try and charge things such as phones through wifi/bt? I know entirely wireless charging exists in some form, but what makes it challenging to make it up to par with normal charging speeds?
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Wi-fi and bluetooth are every low intensity and energy standards of communication. They’re specific names of standards that just establish how things talk to each other and what frequencies they work on.
Wireless charging is limited by power limits since blasting absurd amounts of radio power is frowned upon by governments, power companies, and anyone who needs to stand near it.
Radio frequencies have issues with the inverse square law, so for every 2x the distance, it only delivers 1/4 the power.
Power drop off is fast over distance.
So it is *technically* possible to blast enough power into the air to charge things across the room, but it also requires a metric crap ton of power to do, and the FCC(And likely other regulatory bodies in other countries) places limits on how powerful transmitters can be. 1 watt omnidirectional. Which is not that much power when you add in the inverse square law, and any losses to heat and the antennas.
Some military trials provided 5 watts of power over 20 feet… but with an empty room… since that much power blasting through the air at the wrong frequency is literally a microwave.
Other issues are if it’s omnidirectional, then a lot of power is being blasted out into nowhere. If it’s directional and focused.. then why not just use a close contact wireless charger or plug it in.
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