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A High-Efficiency Broadband Rectifier with Wide Input Power Range

As the core component for RF-DC conversion in different applications of wireless power transmission (WPT) and wireless power harvesting (WPH), the rectifier needs to achieve better performance. However, it is difficult for most topologies to achieve a wide bandwidth while having a wide input power range. Therefore, this paper proposes a high-efficiency broadband rectifier circuit with an extended input power range for wireless power transmission. This rectifier consists of two sub-rectifiers with wide input power range, which work at different optimal operating frequencies. It is possible to broaden bandwidth by introducing a combination of the sub-rectifiers. For validation, the proposed rectifier based on Schottky diode HSMS2820 was designed, fabricated and measured. Within the widest input power level ranging from 5.5 to 27.5 dBm at 2 GHz and the widest bandwidth ranging from 1.3 to 2.7 GHz at 23 dBm, the rectifier can provide an efficiency above 50%.