[SI-LIST] Re: Capacitance

Hi, Ma:

If your 2-port structure is electrically short, you can take the Z(1,1) and
calculate Y = 1 / Z(1,1) where the Y is not Y(1,1). Then, you can find C as:

C = Im(Y) / omega 

Best 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 3:36 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Capacitance
> 
> 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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