FreeLists / si-list / [SI-LIST] Re: non-negative off diagonal capacitive matrix elements ??

["Zabinski, Patrick J." <zabinski.patrick@xxxxxxxx>]

Signal Guy,

The answer is "depends".

If you have a series of microstrip traces all edge
coupled, and the left-most microstrip is identfied
as Signal-1, the next one Signal-2, etc., then the
coupling should be as you indicate.

However, when we first generated some home-brewed EM
software, we made a slight mistake in not assigning
the signal numbers (i.e., matrix locations) in a logical
order.  In other words, we could have the left-most microstrip
being Signal-2, the next one Signal-3, the next one
Signal-1, then Signal-8, etc...  In this fashion, all
bets are off.

If you're getting a non-descending coupling coefficient
as you progress down the matrix, I suggest to double-/
triple-check the order in which your EM tool is
assigning the associated matrix order.

Pat

 
>  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.
> --
> 
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