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

[<Aubrey_Sparkman@xxxxxxxx>]

Ryan,
PERMEABILITY affects the magnetic fields (inductance) like Permittivity
(dielectic constant, capacitance) affects electric fields. =20


Aubrey Sparkman=20
Enterprise Engineering Signal Integrity Team
Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx=20
(512) 723-3592

The Greatest Pleasure in Life is Doing what People say can't be done...

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of ryansatrom
Sent: Wednesday, May 10, 2006 9:08 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Microstrip Trace under Nickel

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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