[SI-LIST] Re: -3dB at S21 graph
- From: "Kai Keskinen" <kalevi@xxxxxxxxxx>
- To: <jian@xxxxxxxxxx>, <sitaskina@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 26 Jan 2006 17:57:43 -0500
20log(Vout/Vin)= 10log(Pout/Pin) = -3dB
This is like a grade 10 electronics problem for when I went to school. Now
it seems to be a 2nd year engineering problem.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Jian X. Zheng
Sent: Wednesday, January 25, 2006 6:35 PM
To: sitaskina@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: -3dB at S21 graph
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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