I think is is a ground plane.
David

Andre Abelian wrote:

> Hi to all,
>
> Apologize if the tag isn't right.
> Friend of mine sent me a picture of this attached board
> that I couldn't recognize the purpose of traces being like that.
> The board is hatched by very specific way
> Any idea why traces are like that? Is it for RF?
>
> Andre
>
>   ------------------------------------------------------------------------
>                  Name: board2.jpg
>    board2.jpg    Type: JPEG Image (image/jpeg)
>              Encoding: base64

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