“…Typical energy sources include solar power, thermal power, wind power, and RF power. Several studies [ 5 , 6 , 7 , 8 , 9 , 10 ] assume that a WRSN sensor node is equipped with an RF energy harvester to harvest the energy emitted by RF chargers. The studies in [ 5 , 6 , 7 ] focus on the deployment optimization of RF chargers equipped with directional antennas.…”