[SI-LIST] Effects of anti-pad diameter on SDD11 for differential vias
- From: Pehr Andersson <andersson.pehr@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 23 Apr 2012 16:43:40 +0200
Hello fellow SI engineers!
I have noticed when running some simulation of vias, that by varying
anti-pad diameter, but keeping other parameters intact, that the return
loss for lower frequencies is higher then for case when the anti-pad is
smaller.
But for the higher frequencies there is an opposite effect, the return loss
decreases with the increasing anti-pad diameter.
I have included the picture that shows this effect.
What is physical explanation for this effect?
Why do RL increase for larger anti-pad compared to via with smaller
anti-pad diameter, when the frequency is < 5GHz ?
Also why do the return loss decreases for the via with larger anti-pad
diameter compared to via with smaller anti-pad diameter, for f > 5GHz ?
Best regards, Pehr
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