> Is glass-epoxie any good? (as in double sided pc board stock) > > Thanks! > > Bill > Hi Bill, The G-10 and FR-4 materials are quite poor as a dielectric. We use Rogers Duroid 3003 2X boards for hi frequency capacitors- pretty much teflon for the substrate except this stuff shears like a dream. The 0.062 material is 23pF/" and the DF is 0.0013. Dale W4OP