Wireless power transfer is an important topic, and many devices these days are charged without any cables. This process typically requires dedicated charging devices. Researchers from USA went further and decided to harvest the energy of electromagnetic waves that already exist around us, for example the energy from the cell phone networks and wi-fi signals. The main problem is that the energy density of the ambient microwave signals is low, and the induced currents in antennas are not sufficient enough to generate any practical output. The authors of this manuscript propose to use a resonant metamaterial absorber that can enhance the induced currents, bringing the realisation of the idea a step closer. Such an approach could be used to power low power devices, including various sensors and health monitors.

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