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DennyShih2

Taiwan
2 Posts

Posted - Jan 11 2024 :  15:01:58  Show Profile  Reply with Quote
Hi Enrico,

Thank you for teaching me how to use "capgen" in my previous topic, I have successfully executed the program. I set two 10X10 plates capacitance separate in 1:

capgen -s1 -w10 -p2 -n10 -d > <myfile.qui>

I get the result:
-----------------------------------
CAPACITANCE MATRIX, nanofarads
1 2
1%GROUP1 1 1.058 -0.8864
2%GROUP1 2 -0.8864 1.058
-----------------------------------
And I know C=#65288;#949;A#65289;/d

In the parallel capacitor configuration I set up, why is there a significant difference in the calculated capacitance values between fastcap and capacitance formula? How do I fix it?

Thank you !

DennyShih2

Taiwan
2 Posts

Posted - Jan 11 2024 :  15:05:08  Show Profile  Reply with Quote
Sorry, the content format has shifted.
capacitance C= e(A/d) e:epsilon
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Enrico

545 Posts

Posted - Jan 16 2024 :  10:12:15  Show Profile  Reply with Quote
The difference is between a physical 3D capacitor and a simplified parallel plate capacitor, where fringing fields are completely neglected. Please see the sample file 'capacitor_simple.lst' in the Samples directory and read the comments inside the file.

Best,
Enrico
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