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Forum index » Science and Technology » Physics » Electromagnetics
stainless steel skin depth in RF applications
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Phony Account
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Joined: 28 Jun 2005
Posts: 10

PostPosted: Tue Jun 28, 2005 9:54 pm    Post subject: stainless steel skin depth in RF applications Reply with quote

Hi group readers,

I realize the conductivity of steel is some 30-40 times worse than that
of copper. But for RF (10-100MHz) applications, it is the skin effect
that matters, then the surface conductivity of stainless is "only" six
times worse then copper.

However, a colleague of mine suggested the picture might be worse,
because at these frequencies we are talking about micron size
skin-depths, and in that case the grain structure of the metal may play
a role not accounted for in the simple theory.

Comments?

Thanks,

Mirko
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Jim Potter
science forum beginner


Joined: 29 Jun 2005
Posts: 1

PostPosted: Wed Jun 29, 2005 1:03 pm    Post subject: Re: stainless steel skin depth in RF applications Reply with quote

Phony Account wrote:
Quote:
Hi group readers,

I realize the conductivity of steel is some 30-40 times worse than that
of copper. But for RF (10-100MHz) applications, it is the skin effect
that matters, then the surface conductivity of stainless is "only" six
times worse then copper.

However, a colleague of mine suggested the picture might be worse,
because at these frequencies we are talking about micron size
skin-depths, and in that case the grain structure of the metal may play
a role not accounted for in the simple theory.

Comments?

Thanks,

Mirko

Also, surface finish plays a role. The effective conductivity is reduced
if the surface roughness is comparable to the skin depth.

Jim
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Phony Account
science forum beginner


Joined: 28 Jun 2005
Posts: 10

PostPosted: Fri Jul 01, 2005 12:24 am    Post subject: Re: stainless steel skin depth in RF applications Reply with quote

Jim Potter wrote:
Quote:
Phony Account wrote:

Hi group readers,

I realize the conductivity of steel is some 30-40 times worse than
that of copper. But for RF (10-100MHz) applications, it is the skin
effect that matters, then the surface conductivity of stainless is
"only" six times worse then copper.

However, a colleague of mine suggested the picture might be worse,
because at these frequencies we are talking about micron size
skin-depths, and in that case the grain structure of the metal may
play a role not accounted for in the simple theory.

Comments?

Thanks,

Mirko


Also, surface finish plays a role. The effective conductivity is reduced
if the surface roughness is comparable to the skin depth.

Jim
Hm, that's interesting. But how exactly does the roughness play a role?

It is much smaller than all wavelengths of interest, so the only
effect I see is that of increased path length. However, the "width" of
the conductor is also increased, so the two would cancel out.

Mirko
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