Hello everyone,

I‘m a student majoring in EE. I want to design a wide-band high-efficiency rectifier for wireless power transmission based on the paper below. I used the same diode as it said: HSMS286c in HFDiode lib. I used the variable 'f' to simulate the Zin in different frequencies. However, the verdict is different from the paper's result and I have no idea why. The imag part is positive but it should be negative. Perhaps I set something wrongly.

What should I do about it?Can any of you help?

Thank you so much.