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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Wireless charging works through induction (Faraday Effect), where high intensity electric field is passed from one coil through a second coil, and the two coils can be separated by space.
The electric fields in WiFi and bluetooth are very low intensity and carry very little energy. The also spread out in every direction. Low intensity dispersed fields would charge a phone battery very very slow.
Power could be transmitted through a focused laser beam with high intensity, but a laser woth several Watts of power would burn anything that got in the way of the transmitter and receiver.
Wireless energy transfer is hard.
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