The resin structure PPO improves overall properties of FR-4. Er stability is vastly improved over FR-4 as well as Loss Tangent and Z-axis expansion.
Rogers Corporation:
Loss tangent = .012 (slightly high)
(usage in digital circutis up to 2.0 ghz)
(usage in analog circuits up to 1.2 ghz)
(Stability in temperature variations good)
Er = 3.5 to 4.3 (at 1.0mhz)
(specific Er is dependent on glass-resin- ration -)
(Er is virtually constant form 1.0mhz to 2.0ghz)
CTEr = +220ppm per degrees C (high). Tg is 180 degrees C.
Electro-deposited Copper only.
(helps in peel strength and delamination)
The resin structure PPO improves overall properties of FR-4. Er stability is vastly improved over FR-4 as well as Loss Tangent and Z-axis expansion.
