The wireless transfer of information has brought a lot of convenience to life. Yet people are not going to stop. The dream of a day when electric cables, outlets and adapters are no longer necessary has driven the research of wireless energy transfer.
What kind of energy could be transferred wirelessly? Obviously, energy stored in chemical bonds within molecules like glucose or methane cannot be transferred without the moving of the material itself; Heat can be transferred wirelessly quite easily, but getting your laptop PC to use heat is not that easy. So we will talk about electric energy, which is being used most widely and easily.
Like wireless information transfer, wireless energy transfer is also based on electromagnetic field. The difference is when you're transferring energy, receive-to-transmit ratio rather than signal-to-noise ratio becomes the most important thing. And usually, the former one is much more difficult to achieve than the latter one over long distances. Based on whether radiative electromagnetic field is generated, the methods of wireless transfer are divided into two categories: near-field and far-field.
Nice idea
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