A High-efficiency RF Energy Rectifier With a Wide Frequency Range

Taking advantage of the nonlinear impedance characteristics of diodes, a high-efficiency radio-frequency (RF) rectifier with an wide frequency band is proposed. The rectifier consists of two sub-rectifiers working in the high-power region and the low-power region, respectively. Power distribution due to nonlinear impedance changes without adding any power dividers or couplers. The introduction of λ/12 and λ/8transmission line has the effect of compensating the imaginary part of diode impedance and suppressing higher harmonics. Apply a λ/4 transmission line to invert the change in diode impedance with respect to input power. The rectification efficiency of the rectifier reaches a maximum of 77.1% at a frequency of 5.8 GHz and an input power of 16 dBm, the rectification efficiency is greater than 50% at 0.4 dBm to 19 dBm; from the simulation results of the rectification efficiency versus frequency, it can be seen that the input power is 16 dBm, the rectification efficiency is greater than 70% from 5.68 GHz to 6.63 GHz.