# [SI-LIST] Re: non-negative off diagonal capacitive matrix elements ??

• From: Mike Jenkins <jenkins@xxxxxxxx>
• To: si-list@xxxxxxxxxxxxx
• Date: Mon, 10 Sep 2001 12:11:21 -0700

```Dear "fname",

It depends entirely on how you number the conductors.  If, for a
given matrix, one renumbers the conductors, swapping the ith and
jth conductors, for example, then that's equivalent to swapping
the ith and jth rows and columns in the describing matrices.

So, the answer is "no", they're not necessarily in descending order.

Regards,
Mike

fname lname wrote:
>
>  Hi Folks,
> I have a question. Should the coupling coefficients in the maxwell
> capacitence matrix always be in the descending order going down along a
> column or can the coupling between the 2nd and 3rd element be greater than
> between the 1st and 2nd element.
> Any help is greatly appreciated.
>
> Thanks,
> Signal Guy.
> --
> >I've just extracted the RLGC matrices for 5 coupled
> >striplines using Apsimtech RLGC.
> >
> >As expected, the diagonal elements of the capacitive matrix are
> >positive capacitance values. All the off-diagonal elements are
> >negative EXCEPT one. Is this correct. It has been a while since I've
> >off diag element were all negative. Anyone know for sure ??
> >
> >The element in column 1 row 5 is the one I question:
> >
> >
> >   3.1600e-15
> >  -4.9360e-16   3.2540e-15
> >  -2.0080e-17  -4.8990e-16   3.2540e-15
> >  -1.3380e-18  -1.9820e-17  -4.8990e-16   3.2540e-15
> >   3.1280e-20  -1.3380e-18  -2.0080e-17  -4.9360e-16   3.1600e-15
> >
> >
> >
> >
> >-Ray
> >
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Mike Jenkins               Phone: 408.433.7901            _____
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