FreeLists / si-list / [SI-LIST] Microstrip Trace under Nickel

["ryansatrom" <ryan.satrom@xxxxxxxxxxx>]

Hello All-

I have been concerned with a microstrip trace traveling under a slab 
of nickel.  There is only a .020" gap between the trace and the 
nickel.  I have done simulations in HFSS to confirm that the Nickel 
has minimal effect on the impedance.

However, it brought up an interesting discussion point that i don't 
really understand:

How does the magnetic properties of a material effect Signal 
Integrity?

I understand that some traces are made out of nickel.  But they are 
typically plated with enough gold that any signal in the MHz and 
higher will only travel in the gold due to skin effect.

Nickel has a relative PERMEABILITY of about 600.  Does this effect 
anything?  Thanks for any help on this.

Regards
Ryan Satrom
Everett Charles Technologies



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