[SI-LIST] Stripline Propagation Velocity
- From: "ryansatrom" <ryan.satrom@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 16 Aug 2012 14:47:23 -0000
Hello All-
I took some VNA measurements on PCB's manufactured with several different
materials.
Each PCB material had two 50 Ohm stripline traces on different layers: A trace
between two 4 mil cores, and another trace between two 8 mil cores.
I expected that the propagation velocity of two traces to be the same, but
measuring the propagation delays indicated that they were not (the PCB launch
and vias were calculated out.)
Of the six different PCB materials that I measured, five of them were faster on
the stripline trace between the 4 mil cores. The differences in speeds were
outside the range that could be attributed to measurement error or
manufacturing tolerances.
What can the differences in speeds be attributed to?
Thanks,
Ryan
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