Interdigitated Electrode Capacitor

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hassan.mahmoud

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I am trying to simulate interdigitated capacitor in HFSS to calculate the capacitance over frequrncy what the best way to excite the structure.
 

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I am trying to simulate interdigitated capacitor in HFSS to calculate the capacitance at different frequencies. But the results are not correct, I tried first with maxwell with DC voltage and when compared the results at low frequencies from HFSS they are not the same. I attached the model if anyone can help.
 

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I'm new to HFSS ( trying to learn ) but Modal Network is fine for this type of Planar Devices.
HFSS Hybrid and Arrays solution type is also used in different type planar problems.
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I have used HFSS Modal Solution and found this Z11 ( Source is Circuit Port )

That's equivalent to 4.2pF@20MHz.
 
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Thanks to the response
Can you uploaded the model you used, I wanted to see how you solved it?
 

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As I have said before, I'm newbie to HFSS and I dont' want you to mislead.
You can verify/compare this result by theoretical calculation.
 

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