Distributed sensors of Electric Vehicles (EV) are extremely important in the EV's Wireless Power Transfer (WPT) technology. However, the characteristics of micro-power sensors are large quantity, wide distribution, and low power level. Therefore, it is not suitable for the micro-power sensors to directly receive energy from the EV's wireless charging system high-power energy transmission. In this paper, an original RF energy harvester has been proposed to solve this problem. Theoretical analysis was conducted on the RF rectifier circuit, and the operating principle of the microwave double-voltage rectifier circuit was established. Numerical analysis was conducted on the rectifier circuit by using Advanced Design System (Keysight-ADS) software. Through a distributed short-end stub matching network and a voltage-doubling rectification topology, the characteristics of compact size, wideband, wide input power range, high rectification efficiency are achieved. The center operating frequency of the RF energy harvester is 2.45GHz, which absolutely avoids all the working frequency of the EV's wireless charging system. The simulation results of this circuit show that under the operating frequency of 2.45GHz and input power of 11~20dBm, the rectification efficiency is greater than 50%, and the highest rectification efficiency is 63%. At an input power of 15dBm and operating frequencies ranging from 1.85GHz to 3.25GHz, the rectification efficiency is greater than 55%, and the highest rectification efficiency is becoming 61%. For validation, the rectifier processed by using RO4003C substrate and metal copper coating, and using printed circuit board technology. The overall size of the rectifier circuit with the SMA-connector is only 3cm×3cm. The measure results of the rectifier circuit are very good. Then, the rectifier cascaded Planar Inverted F-shaped Antenna (PIFA) at 2.45GHz was tested in microwave energy transmission system, and the experimental effects are good. Moreover, considering the advantages of microwave energy transmission systems are wide spatial coverage, flexible transmission distance, and unlimited number of receiving terminals, the proposed RF energy harvester is very suitable for EV distributed sensors' wireless power receive.