[SI-LIST] Re: FEXT for microstrip line doesnt decrease as spacing increase?
- From: Shawn Zheng <shawn.h.zheng@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 20 Sep 2009 17:06:45 +0800
Sorry. Just corrected the subject.
2009/9/20 Shawn Zheng <shawn.h.zheng@xxxxxxxxx>
> Just found that FEXT doesnt necessarily increases as spacing between two
> single ended traces increases.
> FEXT coefficient is proportional to Cm/L-Lm/L. As traces are separated
> further, both mutual indutance and capacitance decrease. So I think it makes
> sense that total FEXT may not necessarily become less.
> For 8mil wide microstrip line with 4mil dielectric thickness, I sweep the
> distance between two traces from 10mil to 29mil. By observing s parameter,
>
> 10mil>11mil>12mil>13mil>14mil>15mil>16mil>17mil>18mil>19mil>20mil>22mil>21mil>25mil>24mil>23mil>26mil>27mil>29mil>28mil.
> 25mil spacing has more xtalk than 24mil and 23mil spacings.
> Does it seem correct to you?
>
> Shawn
>
>
>
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