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
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