[SI-LIST] Re: conductor losses


This formula violates Causulity.

Right way to do this is L = L external + L internal

where L internal = Hilbert[Rac(w)]

Hilbert[Rac(w)] is Hilbert transform of Rac(w), w=2*pi*f
H[Rac(w)]equals to Rac(w) convolution with 1/(pi*w)




--- On Fri, 6/27/08, Saoer Sinaga <saoer.sinaga@xxxxxxxxx> wrote:

> From: Saoer Sinaga <saoer.sinaga@xxxxxxxxx>
> Subject: [SI-LIST] conductor losses
> To: si-list@xxxxxxxxxxxxx
> Date: Friday, June 27, 2008, 6:04 AM
> Hi all,
> Some approximate the resistance of a conductor with the
> following formula R(
> f ) = R_DC + R_AC*sqrt( f ). But I read some where,
> R_AC*sqrt( f ) violates
> the causality and passivity.
> 
> I also found a formula to approximate the conductor loss of
> a plane R( f ) =
> R_DC + sqrt( j * 2 pi * f * mu / sigma).
> Question: Can I also use the same formula for e.g. via ?
> 
> many thanks,
> Saoer Sinaga
> NXP
> 
> 
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