A Miniaturized High Efficiency Microwave Rectifier Within Wide Power Range

In order to solve the problems of low rectification efficiency, narrow wide-power and high-efficiency rectification range and large device size, this design adopts a dual-branch dual-load band-stop circuit structure, and improves the traditional impedance matching and pass-through filter structure. The traditional rectifier circuit is matched by multiple branches, which increases the insertion loss and circuit size. In this design, a microstrip line is added to the front end of the two branches to adjust the real part resistance value, and the band-stop structure is used to reduce the imaginary part resistance value and suppress the high-order harmonics. The effect of wide range matching can be achieved by only one matching in the front end, and the λ/4 microstrip line is added to the high-power branch to change the branch resistance change trend, and the power is reasonably distributed by the resistance change. In addition, the straight-through filter structure is simplified, and a miniaturized rectifier circuit structure is realized, which achieves a wide power range, high efficiency rectification and miniaturization design purpose. At a frequency of 5.8 GHz and an input power of 12.9 dBm, the rectification efficiency of the rectifier reaches 68.6%. Furthermore, over the input power range of -0.4 dBm to 25.2 dBm, the rectification efficiency remains above 60%. The S11 simulation curve of the rectifier also indicates that the reflection coefficient stays below -10 dB from 0 dBm to -30 dBm. Overall, the goal of achieving high-efficiency rectification in a wide power range is successfully achieved through this proposed design.