There're areas to be completed in order to give the readers a more rounded comprehension of the technology. To highlight just one point, if the last image is studied closely you'll notice that the horizontal axis of the graph doesn't show off what units of measurement are used. That's important if you're about to compare technologies.
One aspect that I have not seen in any article covering this power transmission technique is what power is used by the transmitter in comparison to the receivers used. In other words, with no receiver in the vicinity, how many Watts are spent? And I mean NOT the intrinsic circuit power loss but the effective Watts Xmitted...

Note: Would this technology will add itself to the hungry power vampires?