RE: [SI-LIST] : Analytical formula of characteristci impedance fo r microstrip and stripline

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From: Ingraham, Andrew (Andrew.Ingraham@compaq.com)
Date: Tue May 22 2001 - 11:39:59 PDT


> My next question is related to the model:
>
> --------------------------------
> Dielectric I
> --------------------------------
> * Region | Trace | * Region
> --------------------------------
>
> Dielectric II
> ---------------------------------
>
> What material is used in the * regions?
 
If you are asking, which material is actually there when the boards are
made, ask your board vendor. It is whichever layer is prepreg rather than
core material.

If you are asking, what does some tool assume, I can't answer; but I would
prefer the tool NOT to assume either but to let me (or make me) specify.

Regards,
Andy

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