[SI-LIST] Re: Capacitance

Ma,
If you have transmission line impedance and delay, you can calculate L 
and C for any TEM or quasi-TEM continuous transmission line.

Z = sqrt (L/C)
delay = sqrt(LC)

Just do the math and tell us where you're from.

Scott

Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax

http://www.teraspeed.com

Teraspeed® is the registered service mark of
Teraspeed Consulting Group LLC



ma mu wrote:
> Hi all,
>    
>    Thanks .  I have another question for you. I am creating a model with 
> Ansoft designer and I need to find out my transmission line capacitance . 
> Ansoft designer can not calculate the capacitance directly . But can give S,Y 
> and Z parameter. there is a  equation where capacitance could be find out 
> with any of those parameters, I believe Y parameter.  But I forgot the 
> equation. I was looking at my High speed book but could not find it !!!  any 
> help would be appreciated.
>    
>   Ma
> "Jian X. Zheng" <jian@xxxxxxxxxx> wrote:
>   Hi, Ma:
>
> No, I think it is different. |S11| = - 3 dB means |S11| is about 0.707 or
> |S11*S11| = 0.5 or 50% of the power is reflected. If there is little
> metallic, dielectric and radiation losses (normally the case unless for
> antennas), the |S21| should be 0.707 or |S21*S21| = 0.5 or 50% of the power
> is transmitted.
>
> Regards.
>
> ----------------------------------------------------------------------------
> Jian X. Zheng, Ph.D., Zeland Software, Inc.
> 48834 Kato Road, 103A, Fremont, CA 94538, U.S.A.
> Tel: 510-623-7162, Fax: 510-623-7135
> ----------------------------------------------------------------------------
>
>   
>> -----Original Message-----
>> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>> On Behalf Of ma mu
>> Sent: Wednesday, January 25, 2006 2:17 PM
>> To: si-list@xxxxxxxxxxxxx
>> Subject: [SI-LIST] -3dB at S21 graph
>>
>> Hi all,
>>
>> In my insertion loss, S21 graph, I got -3dB loss at 1.5 Ghz. My question
>> is :
>> transmission at 1.5 Ghz is 50% or 70% ? I thnik 50% . please give
>> me feedback.
>>
>> Ma
>>
>>
>>
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>
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>
>
>               
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