[SI-LIST] Re: Outer Shield of coaxial cable
- From: Neo <neoflash2008@xxxxxxxxx>
- To: 'steve weir' <weirsi@xxxxxxxxxx>, "Kenneth W. Egan" <kegan@xxxxxxxxxxxxx>
- Date: Wed, 3 Mar 2010 13:30:52 -0800 (PST)
They match pretty well with field solver. The small difference might be from
the dielectric material loss tangent.
Regards,
Neo
--- On Wed, 3/3/10, Kenneth W. Egan <kegan@xxxxxxxxxxxxx> wrote:
From: Kenneth W. Egan <kegan@xxxxxxxxxxxxx>
Subject: RE: [SI-LIST] Re: Outer Shield of coaxial cable
To: "'Neo'" <neoflash2008@xxxxxxxxx>, "'steve weir'" <weirsi@xxxxxxxxxx>
Cc: "'List Si'" <si-list@xxxxxxxxxxxxx>
Date: Wednesday, March 3, 2010, 9:10 PM
For a generic 26ga cable with shield the Total S21 should be about
1.5468dB/m or thereabouts @ 3GHz. So the TOTAL S21 is around 15.4dB @ 3GHz
This figure isn't the shield contribution.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Neo
Sent: Wednesday, March 03, 2010 2:31 PM
To: steve weir
Cc: List Si
Subject: [SI-LIST] Re: Outer Shield of coaxial cable
Hi,
I think I exaggerated the loss contributed from outer shield.
I checked the data again. At 3GHz, 10m AWG26 cable has three results:
1.) 3mil outer copper: S21 = -13.6dB
2.) 1mil outer copper: S21 = -14.1dB
3.) 3mil ideal conductor: S21 = -10.4dB
Does it make sense this time?
Regards,
Neo
--- On Wed, 3/3/10, steve weir <weirsi@xxxxxxxxxx> wrote:
From: steve weir <weirsi@xxxxxxxxxx>
Subject: [SI-LIST] Re: Outer Shield of coaxial cable
To: "Neo" <neoflash2008@xxxxxxxxx>
Cc: "List Si" <si-list@xxxxxxxxxxxxx>
Date: Wednesday, March 3, 2010, 3:10 AM
Neo, if 3 mils of Cu shield thickness is showing up as your dominant
loss, then you are either running at deep sub MHz frequencies, or you
set the problem up incorrectly.
Steve.
Neo wrote:
> Hi folks,
> I have a question about the outer shield metal of a coaxial cable.
>
> For a AWG26 cable, what is thickness of the usually used outer shield
copper layer? I tried to use 3mil, and the field solver told me that the
most lossy part of the cable is the shield.
>
> Any suggestion?
>
> Regards,
> Neo
>
>
>
>
>
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--
Steve Weir
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