[SI-LIST] Re: Conductor loss or Dielectric loss
- From: "hkkim" <khk264@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sat, 11 Nov 2006 14:31:17 +0900
What about metal roughness?
Is skin effect all that I should consider about conductor loss?
HK Kim
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Andrew Byers
Sent: Saturday, November 11, 2006 3:58 AM
To: saoer.sinaga@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Conductor loss or Dielectric loss
Hello HK Kim,
Conductor loss (skin effect region) results in attenuation increasing with
the square root of frequency. On a log-log plot this is a slope of 1/2.
Dielectric loss results in attenuation increasing proportional to frequency.
On a log-log plot this is a slope of 1.
For most PCB-type geometries, you will see the skin effect slope first, then
eventually at a high-enough frequency you will see the dielectric loss slope
begin to dominate. But the sequence of these loss mechanisms will depend on
the loss tangent and your line dimensions. They might blur together and be
hard to distinguish. As Saoer pointed out, a good exercise would be to use a
2D EM simulation tool and toggle on and off the different loss mechanisms by
using perfect conductors and no-loss dielectrics. This will help you isolate
each loss mechanism and study the characteristics independently.
Good luck,
Andy Byers
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Saoer Sinaga
Sent: Friday, November 10, 2006 8:08 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Conductor loss or Dielectric loss
Can you be more precise on what you really want?
You want to simulate only? or you want to measure as well?
Try to compare with simulation results when metal or substrate are perfect.
Saoer
On 11/10/06, hkkim <khk264@xxxxxxxxx> wrote:
>
> Hi!
>
>
> I want to test and simulation microstrip line's characteristic impedance
> at
> PCB as frequency is increasing.
>
> But at attenuation factor, there are conductor loss(skin effect) and
> dielectric loss.
>
> How can I distinguish each other?
>
>
>
> HK Kim
>
>
>
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