[ApK]

Originally Posted by HarryT

The energy density is too low to be useful.

Are you sure? Maybe SAIC thought they were on to something.

If an array of energy harvesting antennas is used to receive the RF energy, the power collected from all channels (i.e., the power density at all antenna inputs) can be combined, rectified and forwarded to the trickle charger 164. The power available in each channel is comparable; thus, for example, if 100 N nW is required for a load, the power collected in N channels at 100 nW each can be combined to generate the required power.