Here's some information on high frequency values I believe to be fairly
reliable. Based on 4-ply 7628 glass (28-mil). Still some variability (just
like all things):
Freq. FR-4 Getek
1 MHz 4.6-4.7 3.6-4.2
2 GHz 4.5-4.6 3.91
4 GHz 4.4-4.5 3.90
6 GHz n/a 3.88
Glenn Pelkey
Quality/Reliability Engineer
Maxtek Components Corp.
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