Electromagnetic Field as the Wireless Transporter of Energy

The beginning of the XXI century brought a further significant development in the use of autonomous electrical and electronic equipment. The low consumed power equipment is widely used: laptops, mobile phones, PDA, wireless headphones, implants, razors, toothbrushes etc. The higher power consumption equipment is also starting to work wirelessly, e.g. the intelligent machining complexes, robots, the forklift trucks, and electric or hybrid cars. The desired autonomy and transportability of the equipment requires autonomous energy sources. Until now, almost without exception, the autonomy is guaranteed by electrochemical power with its main problem: to charge, replace and dispose batteries. Engineering world is seeking a non-conventional, wireless transfer of energy, both for charging batteries and directly supplying the equipment. The electromagnetic field is the usual carrier for telecommunicated information. Here an example is shown of electromagnetic transfer of energy, avoiding even the use of ferromagnetic cores.