Study on the improvement of RF-DC conversion efficiency of microwave rectifiers with pulse modulation

摘要

Currently, the necessity of the Internet of things (IoT) technique is increasing. IoT requires a flexible configuration of sensor networks, which is hindered by wired- charging sensors. The microwave wireless power transfer (MWPT) can be the solutionto this problem. Although MWPT enables integrating communications and battery-less motion of the sensor network, it interferes with communications and its charging efficiency is lower than the wired charging. So improvement of the transmission efficiencyis veryimportant for practical use of MWPT. MWPT has many loss components. This study focused on radio frequency to direct current (RF-DC) conversion efficiency of rectifiers. In former study, input waves which have high peak-to-average power ratio (PAPR) is effective for improving the RF-DC conversion efficiency of rectifiers. Pulse modulation can make higher the PAPR of input waves. So we studied about the rectifiers with pulse modulated input as shown in Fig. 1 in this thesis.