FreeLists / si-list / [SI-LIST] Re: Rectangular patterns on Toplayer.

[cadpro2k@xxxxxxxxxx]

Hi Ismail,

This is simply "added copper" to the outer board layers to ensure a 
consistant plating thickness across the surface of the boards. This is 
generally added by the fabrication house, without cost, to provide them 
better quality. Generally there is no problems associated with the 
practice, as long as the fab shop has guidance regarding how close to 
"features" they can get, but there are some times issues. This is 
definitely NOT a practice for RF designs.

Good day.

Mitch

---------Included Message----------
>      Date: Tue, 02 Jul 2002 09:17:28 -0400
>      From: "Alex McPheeters" <amcpheeters@xxxxxxxx>
>      Reply-To: <amcpheeters@xxxxxxxx>
>      To: <ismailb@xxxxxxxxxxxxxxx>, "si-list" <si-list@xxxxxxxxxxxxx>
>      Subject: [SI-LIST] Re: Rectangular patterns on Toplayer.
>      
>      
>      I'm not going near this with a 10' pole!
>      
>      
>      At 06:26 PM 7/2/02 +0530, Ismail B - CTD, Chennai. wrote:
>      >
>      >Hello guys,
>      >
>      >I don't know whether this question has any relevance to signal 
integrity.
>      >But In some boards I see islands of copper (like rectangular 
patterns) on
>      >the top layer. I just wonder why this kind of pattern is used. 
Is it any
>      >thing to deal with EMI or what???
>      >
>      >Thanks a ton,
>      >Ismail
>      >
>      >
>      
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>      
>      Alex McPheeters
>      Vice President, Business Development
>      American Computer Development Inc.
>      Office - (301) 620-0900
>      Fax - (301) 620-9099
>      Cell - (301) 305-3051
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>      "The secret of success is constancy of purpose."
>      Benjamin Disraeli (1804 - 1881)
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