Intuitive understanding of wireless power supply
There is no essential difference between wireless power supply technology and transmitting and receiving technology used in radio communication.
But the former focuses on the transmission of energy, rather than the information attached to it.
The biggest difficulty of wireless power supply technology lies in the dispersion and undesirable absorption and attenuation of radio waves. For radio communication, the dispersion of radio waves is not even a bad thing, but it may bring serious transmission efficiency problems to wireless power supply.
One way is to use microwave or even laser transmission. Theoretically, the shorter the wavelength of radio wave, the better its directivity and dispersion. There are also concerns about the health risks that this technology may bring to people. Although there is not much evidence to confirm or deny this risk, experiments have exposed several generations of animals to microwave and stronger radiation environment, and no health effects have been found.