An Ultrawideband High-Efficiency Rectifier Based on Harmonic Feedback Topology

With the rapid and extensive development of wireless communication and low power electronics, electromagnetic wireless power harvesting (WPH) draws more and more attention. As the core component for RF-to-DC power conversion, its characteristics determine the performance of the overall WPH system. To obtain as much dc energy as possible, ambient electromagnetic energy with various frequencies should be efficiently rectified. Therefore, it is important to widen the operating bandwidth of the rectifier. According to the theoretical analysis of the Schottky diode, it can be found that if the harmonic components generated by the diode can be fed back through a specific approach for rectifying, the bandwidth of the rectifier will be effectively improved. Therefore, a broadband rectifier has been proposed based on the previous principle. For validation, a wideband rectifier based on Schottky diode SMS7630 had been designed, fabricated and measured. When the input power level is 0 dBm, the conversion efficiency of the implemented rectifier is larger than 40% from 0.4 to 2.6 GHz within a relative bandwidth of 146.67%, exhibiting an ultrawide bandwidth compared with existing state-of-the-art configurations.