Abstract: A novel microstrip rectifying circuit is proposed in this paper. The rectifying circuit consists of a cross-shaped match stub, a diode and a DC-pass filter. The match stub is designed to match the two impedances of the diode at different frequencies to 50W. The DC-pass filter effectively blocks the fundamental frequency and the higher order harmonics.The rectifying circuit is analyzed and designed with the software ADS2011. On the condition of 10mW input power, the simulated RF-DC conversion efficiencies of 75. 8% and 71. 1% are obtained at 1. 8GHz and 2.4GHz, respectively. The measured conversion efficiencies are 50% and 54% at 1. 8GHz and 2.2GHz, respectively. The causes of error are analyzed. The rectifying circuit operates at a low input power and is easy to be integrated. It can be applied to energy supply for RFID systems and embedded wireless sensors.