A novel microwave rectifier with a short-ended eighth-wavelength microstrip transmission line in series with a Schottky diode is presented. The input low-pass filter in conventional rectifiers is removed to improve the conversion efficiency and reduce the size of the rectifier. In the proposed shunt diode topology, a short-ended transmission line is inserted between the diode’s cathode and Ground(GND), which balances the capacitive impedance of the diode at the fundamental frequency. As a result, both the input low-pass filter and the impedance matching circuit are removed. Results show that it can realize high conversion efficiency with a wide input power and frequency range. The measured efficiency keeps above 70% while the input power varies from 12 dBm to 24 dBm, and the frequency bandwidth extends to a range from 1.5 GHz to 2.1 GHz. The maximum rectifying efficiency of 83.3% at 21.8 dBm input power is obtained. The fabricated rectifier has a compact dimension of 15 mm×20 mm.