A three-stage rectifier containing three diodes is proposed in this paper.These diodes with different threshold voltages are located in three branches to achieve high conversion efficiency for different input power levels.By combining the three branches,the proposed rectifier is enabled to achieve high conversion efficiency over a wide dynamic input power range.A prototype of a 2.4 GHz rectifier is designed,simulated and measured.The efficiency of the three branches remains above 30% in the power range of -10-11 dBm,11-24 dBm and 24-35 dBm,respectively.The measured results show that the conversion efficiency maintains over 40% within the input power range of -6-25 dBm,with the maximum conversion efficiency reaching up to 71.2%.It indicates that the proposed rectifier can achieve low sensitivity to input power variation and high conversion efficiency over an ultra-wide input power range,which can be used in energy harvesting or dynamic wireless power transmission systems.