> The STOs are connected in parallel (Fig. 1a) or in series (Fig. 1b) configuration, stimulated by a single dc source. For the parallel connection, at the dc bias (Idc) value of 1.5 mA
Fig 2c and d shows the total output power which maxes out at 0.85 uW. Maybe this is enough to run a pacemaker or something small, I don't actually know. Fig 6 shows the rectification of the signal in to a voltage that can turn on an LED. The dc-dc converter puts it in the ~3V range. Assuming the dc-dc converter is near 100% efficiency (some are pretty damn good) this is a current of only 0.28 uA.
Its a novel way, but they talk about in their own paper that it is not a new more efficient way to convert RF energy to DC energy
> in the range of 1.65–2.8 GHz at Prf = 0 dBm and zero dc bias ac to dc conversion efficiency of ∼6% at Prf = −20 dBm. This is higher than the reported values for STOs53,55 but less than the recent reports of power conversion efficiency of 40% and 40–70% at an input rf power ~0 dBm for MoS2-based flexible rectenna and state-of-the-art Si and GaAs rectifiers56
> For the condition of synchronization of four oscillators at 2.4 GHz with Idc,sync = 3 mA (1.2 mA) for the parallel (series) configuration
That’s very low but I think a first step in order to power small biometric implants, for example some kind of pacemakers. It’s very frustrating have a surgical operation to change the battery every 10/15 years.