A three-stage rectifier containing three diodes is proposed in this paper. These diodes are located in different branches to achieve high conversion efficiency for different input power levels. By combining these branches, the proposed rectifier is able 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 each branch remains above 30% in the power range of -10 to 11 dBm, 11 to 24 dBm and 24 to 36 dBm, respectively. The measured results show that the conversion efficiency maintains over 40 % within the input power range of -6 to 25 dBm. The maximum conversion efficiency can reach 71.2%. It indicates that the proposed rectifier can achieve less sensitivity to input power variation and can achieve high conversion efficiency over an ultra-wide input power range, which can be used in energy harvesting or dynamic wireless power transfer systems.