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Loadpull simulation in ADS

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lzjc

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Hello everyone, I am currently learning ADS, especially loadpull simulation. I started with the tutorial found here: **broken link removed** unforturnately I with the same schmatic I could not get reasonable results.

The reason could be the author used short circuit (with an impedence 0+j*0) for higher harmonics, if I change the load impedence to other value instead of 0 it's ok.

I just want to know why does this happen? I really appreciate if someone can help.
 

Updates,

I found changing the load impedence for fourth harmonic(others remain 0) had impressive effects on output power. I can not understand....
 

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