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Recommendation for modeling software

Question asked by jlinstrom on May 19, 2010
I am building capacitance sensing electrodes to detect insects/small animals.
The electrode shapes are mostly driven by animal/environment restraints and I need a way to estimate
parasitic/residual capacitance; the ICs I use only allow so much nulling.
I have gerber/dxf of the layers and can generate 3D models.
Any suggestions for a way to model both the parasitics and resulting change in capacitance with a cylinder of radius R, mainly water (Er~80)?

Thanks-
john  

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