The effective Dk will increase in part due to roughness of the copper foil on
the laminate. Here is a link to my DesignCon 2017 paper that delves into the
phenomenon you might find helpful.
http://lamsimenterprises.com/Paper_APracticalMethodtoModelEffectivePermittivity_Simonovich.pdf
Bert Simonovich
On May 16, 2018, at 9:21 PM, Hung Dang <hungdn.hcmut@xxxxxxxxx> wrote:
Dear Expert,
When I run SI simulation, I apply Dk/Df of PCB material from datasheet.
After fabric progress, I measured on the actual board, Dk is increased
28.7% (3.65 --> 4.7) and 41.6%(0.012 --> 0.017) for Df when comparing with
value in datasheet.
So I have concerns below:
1/. What is the Dk/Df worst value which I should apply to simulation phase?
2/. Could you help to list some application note or paper which talk about
this issue?
Thank you so much.
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MS Hung-Dang Ngoc
Email: hungdn.hcmut@xxxxxxxxx <phandainghiamnc@xxxxxxxxx>
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