Wireless charging is fun, but the limited range and speed of induction charging makes it more of a gimmick than a useful tool for the moment. Samsung is looking to resolve one of those limitations by using far field energy transfer; their current prototypes are able to reliably transfer power over 40cm but they intend far more. The Register describes the major hurdle for transferring power this way, interference between the antennas because of motion or signal interference significantly reduces the efficiency of power transfer. Take a look at how they propose to solve this issue as well as alternate suggestions from different researchers.
"An alternative approach is far-field energy transfer, which requires two antennas, one sending electromagnetic waves to the other. The receiving antenna then converts this radiation into electric currents."
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