Powercast Powerharvester Chipset PCC110 Issues
The PCC110 is stated as operating from -17dBm upwards - to expect that level of RF signal prevailing even in a so-called "noisy" environment is hoping a lot. At (say) 1GHz and at (say) 10 metres distant from a 1 watt transmitter, the free-space link loss in dB is: -

32.45 + 20 log\$_{10}\$(MHz) + 20 log\$_{10}\$(km) =

32.45 + 20 log\$_{10}\$(1000) + 20 log\$_{10}\$(0.01) =

32.45dB + 60dB - 40dB = 52.45dB

Total power one could expect to receive is 30dBm (1W) - 52.45dB = -22.45dB i.e. below the lower limit for the device to work. It is intended for RFID applications is my conclusion.