[SI-LIST] Why is my PCB loss so high?

  • From: Joel Brown <joel@xxxxxxxxxx>
  • To: SI-List <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 7 Apr 2015 14:00:52 -0700

We have had several boards made from Isola FR408HR.
My understanding is that at 3 GHz loss should be about 0.3 db / inch.
On one board I am measuring about 0.76 db / inch, on another 1.4 db / inch.
What can account for this?
Thanks


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