[SI-LIST] Re: Inserion loss of fr4 , 50 ohm trace .

  • From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
  • To: "sunil_bharadwaz@xxxxxxxxx" <sunil_bharadwaz@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 27 Nov 2013 18:41:02 +0000

I would suspect an error in your measurement methodology.  I would re-examine 
your de-embedding scheme and/or try with another scheme to verify the 
credibility of your measurements.  In trying to discern a mere -1.8dB of 
insertion loss, you are going to have to have a very good de-embedding 
("calibration") scheme.  If the board wasn't carefully architected to enable 
measurements in the first place, you'll be very challenged to get accurate 
measurements.

Jeff Loyer


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of sunil bharadwaz
Sent: Wednesday, November 27, 2013 9:53 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Inserion loss of fr4 , 50 ohm trace .

Thanks to all who have replied & contributed to this thread so far ..
I have done little more investigation with the fab . From what i seem to gather 
is that , the ENIG coat is only done at the Component foot print pads . Meaning 
, if there is a long RF trace , ENIG would be coated at the start point , where 
RF IC is soldered .The O/P trace of the RF IC to the Antenna ( long trace , 
where unexpected insertion loss )  , would not have the ENIG coated . So nickel 
coat may not be the reason .
Is my thinking right or am i missing anything fundamentally ?

Regards
Sunil.B

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field


List forum  is accessible at:
               http://tech.groups.yahoo.com/group/si-list

List archives are viewable at:     
                //www.freelists.org/archives/si-list
 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts:

  1. Home
  2. si-list
  3. Archive
  4. 11-2013