Recent development of RF-to-dc rectifying technologies for wireless power transfer

In this paper, we aim to summarize the recent development of radio-frequency (RF)-to-dc rectifying circuits designed for microwave power transfer (MPT) systems. First, we review the history of the rectification development from mechanical devices to wide-bandgap semiconductors. Next, according to their operating frequencies and input power levels, we summarize the rectifying diode devices widely used in the literature, which can be used as a guide manual to select the rectifying diodes properly for designing the rectifying circuits. Then, various rectifying circuits developed at different input power levels in recent years are summarized. Finally, we summarize the methods to model the diodes for more precise design of the RF-to-dc rectifying circuits.