Hi Tommy,
What is the frequency of the dip or dips?
Do you see dips or bumps on the other s-parameters? - single-ended s11, s31,
s41?
Best regards,
Yuriy
Yuriy Shlepnev, Ph.D.
President, Simberian Inc.
www.simberian.com
Simbeor THz - Accurate, Productive and Cost-Effective Electromagnetic Signal
Integrity Software to Design Predictable Interconnects!
Simbeor SDK - The Industry-First Signal Integrity Analysis Automation Kit!
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Tommy Huang
Sent: Friday, May 28, 2021 3:35 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] S21 or Sdd21 with sharp dip
Hi Experts,
When I measure s-parameters of transmission line, I found S21 or Sdd21 cure
with sharp dip at some frequency points, but there is no dip for shorter
trace at same layer.
I read Eric Bogatin's article "How to Read S-Parameters Like a Book", there
is a section is about "sharp dip", but its seem not match my case. In fact
we use standard Delta-L coupon design to do measurement, then implement
de-embedding. When we put Sdd21 curve together, Sdd21 of 10inch trace have
obvious dip, 5inch trace also have but not obvious, 2inch trace no(perhaps
submerged by multi-reflection?),And the dip frequency point of 10inch and
5inch trace are almost same. After de-embedding, the dip is more obvious.
Is there any advice or experience to share? We could do some test and study.
B&R
Tommy
Legal Disclaimer: The information contained in this message may be
privileged and confidential. It is intended to be read only by the
individual or entity to whom it is addressed or by their designee. If the
reader of this message is not the intended recipient, you are on notice that
any distribution of this message, in any form, is strictly prohibited. If
you have received this message in error, please immediately notify the
sender and delete or destroy any copy of this message.
------------------------------------------------------------------
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
------------------------------------------------------------------
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
