You can charge your phone on a “charging mat” if you don’t want to plug it in, and in the future, you may not even have to put it down. However, one major challenge for long-distance wireless charging is the difficulty of consistently transferring a sufficient amount of energy from electromagnetic waves to the battery. Now researchers have demonstrated a new concept that solves this problem and that has advantages over previous solutions. Carefully chosen electromagnetic waves are sent from the battery circuit to interfere with the electromagnetic fields at the receiving antenna in a way that improves the transfer efficiency and could lead to more practical, long-distance wireless charging.

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