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EM-cosmulation vs. schematic results of the pcb board

Question asked by jeff0283 on Dec 16, 2015
Latest reply on Dec 26, 2015 by volker_muehlhaus
Hi, I am designing a power amplifier on the pcb board.
I want to see the impedance of the bias part(RF choke to the DC input terminal).
I've compared the results of schematic and em-cosimulation,
Layout.png
schematic.png

But the two results are quite different.(red is for em-cosimulation and blue is for schematic) 
result2.png

You can see there is a knot on the red curve, and I am wondering if my em setup is right...
Here is the result of em simulation result(only for layout not em-cosimulation),and it looks strange...
result.png

Does anyone have any idea??
Thanks~  

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