[SI-LIST] AW: Re: AW: Shielding vias around microstrip

  • From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
  • To: "afu@xxxxxxxxxxxxxxxxxx" <afu@xxxxxxxxxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 26 Nov 2014 12:53:06 +0000

You are correct.
Stripline is always the best choice, but often Microstrip is cheaper.
Stripline already gives you good isolation when the traces are 5 tracewidths 
and more apart, while in Microstrip the Fields are larger and often 
10xtracewidth and more is needed for decent isolation. That’s also the reason 
why the vias don't really shield because most of the Field is in open space and 
do not even see the vias.
BR
Gert


Besuchen Sie uns auf der SPS/IPC/Drives 2014 vom 25. – 27. November 2014 in 
Nürnberg, in Halle 10, Stand 140.
http://www.HARTING.de/SPS


----------------------------------------
Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp; 
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Vertretungsberechtigte Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning, 
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im 
Auftrag von hws
Gesendet: Mittwoch, 26. November 2014 13:41
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: AW: Shielding vias around microstrip

Hello Gert,

am I wrong to recomend going from Microstrip to Stripline ?

If shielding is a real need .... ?


Herbert

Am 26-11-2014 12:23, schrieb Havermann, Gert:
> Dear Longjun Zhou,
> the message came in messy so I don't know the exact question. You can try 
> again and change the mail format to "text only". sometimes that helps.
>
> regarding stitching vias around Microstrop I can say that these do not really 
> shield. The crosstalk to other traces will not be significantly reduces by 
> adding these vias. I addition, the space between the vias can act as a filter 
> and give your microstrip a very narrow stop-band (depending on distance and 
> frequency).
>
> I prefer not to use stitching vias around traces, and even guard traces can 
> generate more problems than they claimed to solve.
>
> BR
> Gert
>
>
> Besuchen Sie uns auf der SPS/IPC/Drives 2014 vom 25. – 27. November 2014 in 
> Nürnberg, in Halle 10, Stand 140.
> http://www.HARTING.de/SPS
>
>
> ----------------------------------------
> Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 
> Espelkamp; Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 
> 8808; Vertretungsberechtigte Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning, 
> Dipl.-Ing. Torsten Ratzmann, Dipl.-Wirtschaftsing. Ralf Martin Klein
>
> -----Ursprüngliche Nachricht-----
> Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im 
> Auftrag von Longjun Zhou(LUXSHARE-ICT)
> Gesendet: Mittwoch, 26. November 2014 13:11
> An: si-list@xxxxxxxxxxxxx
> Betreff: [SI-LIST] Shielding vias around microstrip
>
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