[SI-LIST] [SI-LIST]Re: Problem with Ni plated transmission line
- From: "Issa, Elie" <Elie.Issa@xxxxxx>
- To: <mherndon@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 17 Mar 2003 08:37:06 -0600
Matthew:
Dr Johnson puts, as in his newsletter quoted earlier by Dr Wheeler,
the relative permeability of Nickel to 10 as typical
value at 1GHz(the range was 5-20).
Regards
Elie
-----Original Message-----
From: Matthew Herndon [mailto:mherndon@xxxxxxxxx]
Sent: Friday, March 14, 2003 5:57 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Fw: Problem with Ni plated transmission line
The discussion of permeability of nickel raises a question in my mind.=20
This may be a dumb question, but I bet others on the list are wondering=20
about it.
I thought the permeability of ferromagnetic materials was highly=20
frequency-dependent, and that they disappear at higher frequencies. I=20
seem to recall that for iron at least you don't see the effect above a=20
few MHz, and relative permeability approaches unity.
Does anyone know more about this than I do?
-matt
Matt Herndon
ECAD Group
Apple Computer
On Friday, March 14, 2003, at 01:44 PM, John Barnes wrote:
>
> Daniel,
> I am in the middle of writing an appendix for my book, Robust=20
> Electronic
> Design Reference, on important properties of conductors. All of the
> handbooks I've read so far say that nickel has relative permeability=20
> (mu
> sub r) of 50 to 350, with 100 being typical.
>
> John Barnes KS4GL, PE, NCE, ESDC Eng, SM IEEE
> dBi Corporation
> http://www.dbicorporation.com/
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