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Mizart
Germany
2 Posts |
 Posted - Feb 04 2015 : 16:25:26
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Hello guys,
I am actually a master student working on my master thesis. My project is to designing some planar micro-coils transferring wireless power to some of our chips. With some success I am already using FastHenry to extract the needed inductance and resistance matrice. Keeping the efficiency of the system high (in resonance) I would like to have a guess on the parasitic capacitance of the coils.
So I started to transfer the coils-geometry using ConverHenry and put each coil for itself into FastCap (otherwise FastCap runs out of memory). I am getting some results, but still wondering:
1) Does FastCap considers fringe fields?
2) FastCap calculates the capacitance over the energy in the e-field surrounding the conductor which is set to 1 Volt, right?
3) Does FastCap assume vacuum around the conductor at default?
That's all so far. Thanks for trouble!
Mizart
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Enrico
550 Posts |
Posted - Feb 05 2015 : 23:52:21
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quote:
1) Does FastCap considers fringe fields?
Long answer: FastCap and FasterCap fully solve the quasi-static electric field equations. They do it without the need to compute the actual field in every region of the 3D space, but they rely on a surface formulation, that is anyway perfectly equivalent (with no approximation in this equivalence) to the volume formulation.
So the short answer is: yes, of course!
quote:
2) FastCap calculates the capacitance over the energy in the e-field surrounding the conductor which is set to 1 Volt, right?
Well no, the calculation is not through the energy in the e-field surrounding the conductor. I suggest you to read either the original FastCap paper (you can find it on the MIT web site, the links page is in our "products" page, right column), or the white paper "The Treatment of Dielectrics in FasterCap" under the 'literature' page that gives a nice summary of how FastCap and FasterCap works (and you can even just read the first part, if you are not interested in the dielectrics themselves).
quote:
3) Does FastCap assume vacuum around the conductor at default?
Yes
Best Regards,
Enrico
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Mizart
Germany
2 Posts |
Posted - Feb 06 2015 : 12:25:35
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Thanks Enrico for the clear feedback!
I'll follow your advice and go through the theory of the papers.
Best regards,
Mizart |
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FastCap: fringe fields and some more questions
