FreeLists / si-list / [SI-LIST] Surface roughness of PCB tracks at track/substrate interface ?

[Steve Rogers <SRogers@xxxxxxxxxxxxx>]

Hello all,

I am trying to find out value for the roughness of PCB traces on the
substrate side of the track.
As I understand it, a level of roughness is essential in order that the
metal bonds mechanically with the substrate material. However I do wonder
how much this rougness effects the Resistance of the trace at high
frequencies. Some recent experiments I have carried out suggest that it may
be quite significant. The skin depth is half the solution (I think), but I
need some idea of how 'rough' typical surfaces are in order to get some idea
of losses?

All suggestions on this one are welcome

Many thanks in advance

Steve Rogers


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