[SI-LIST] Re: Return loss

  • From: "Moreira, Jose" <jose.moreira@xxxxxxxxxxxxx>
  • To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 6 Apr 2017 10:23:32 +0000

Connector and via ??? for 50 to 70 GHz you need to use some very fancy stuff 
especially if you are using a via.

I would be surprised if you even get close to  -17 dB  return loss at 70 GHz 
with a via and connector when you measure real HW.

You can check the BITS 2016 paper "PCB Test Fixture and Socket Challenges for 
mmWave Applications" and see some examples of connectorized structures and the 
kind of measured results you get.

Jose

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of SureshKumar Ayyavu
Sent: Thursday, April 06, 2017 11:56 AM
To: eric@xxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx; eric@xxxxxxxxxxxxxxx; Hindle, Patrick 
<phindle@xxxxxxxxxxxxx>; Love, Janine <jlove@xxxxxxxxxxxxx>
Subject: [SI-LIST] Return loss

Dear Experts,

I'm working on the optimization of  a PCB for 50 to 70 frequency band... For 
this frequency band , I'm expecting RL<-17dB.
My topology is DUT via - Coplanar line - via - microstrip - connector.

I did the simulation and get the 50 ohm +_5% for the whole path. But the RL is 
very poor in 50-70 GHz band.

Please guide , how to improve the RL in that frequency band ???

Thanks
Suresh

Sent from my iPhone 

On 29-Mar-2017, at 7:35 PM, Eric Bogatin <eric@xxxxxxxxxxxxxxx> wrote:

Ever wonder just what is a Smith Chart and should I care? Check out my 
latest blog on the SI Journal:
https://www.signalintegrityjournal.com/blogs/4-eric-bogatin-signal-int
egrity 
-journal-editor/post/383-decoding-the-smith-chart-for-signal-integrity
-engin
eers


--eric











*******************************************************
Dr. Eric Bogatin

Dean,  <http://www.bethesignal.com/> Signal Integrity Academy

Editor,  <https://www.signalintegrityjournal.com/> Signal Integrity 
Journal,


Adjunct Prof, ECEE Univ of Colorado, Boulder

Director, Teledyne LeCroy Front Range Signal Integrity Lab

105 S Sunset St, Suite J

Longmont, CO 80501 USA

Twitter @beTheSignal
e:  <mailto:eric@xxxxxxxxxxxxxxx> eric@xxxxxxxxxxxxxxx

cell: 913-424-4333

<http://www.bethesignal.com/> www.beTheSignal.com
******************************************************





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