A High-Efficiency Inverse Class-F Microwave Rectifier for Wireless Power Transmission

A high-efficiency inverse class-F microwave rectifier for wireless power transmission is described in this letter. The proposed inverse class-F harmonic termination network is realized by connecting a lambda/12 open-ended transmission line in parallel with the diode cathode, and a lambda/8 short-ended transmission line in series with the diode anode. This structure yields a compact layout, and measurement results have demonstrated a peak conversion efficiency of 80.4% for an input power of 13 dBm at 2.35 GHz, and an efficiency larger than 60% within the bandwidth 2.25-3 GHz and for a wide range of output loads.