Does the -31dB sensitivity CMOS rectifier circuit collect, energy from surrounding RF waves?
Almost any sensor, even a bare piece of wire can collect RF energy. The major question: with what efficiency? The antenna is the first sensor on wireless power transfer and it dramatically affects the total performance.
Hello. Efficiency is important indeed. I designed highly efficient rectifiers, 75% and 85% efficiency. What is minimum amount of power coming from the antenna to turn on rectifier and produces a 1V output voltage? Therefore sensitivity is an important parameter for powering wireless sensor network from ambient radio frequency waves. We can increase sensitivity by optimization design of both impedance matching network and rectifier. In literature the highest sensitivity achieved is -32dBm (S. Oh & D. Wentzloff)
According to S. Oh & D. Wentzloff [1], you need about -32dBm at the input, to produce 1V output voltage.
[1] S. Oh and D. D. Wentzloff, "A −32dBm sensitivity RF power harvester in 130nm CMOS," 2012 IEEE Radio Frequency Integrated Circuits Symposium, 2012, pp. 483-486, doi: 10.1109/RFIC.2012.6242327.
Might be helpful for sensor networks
Article Wireless Power Transfer in Wirelessly Powered Sensor Network...
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