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Defining Stackup

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Hello What is the di-electric constant for conductor layers and planes while defining layerstackup? Thanks Pramod


Originally posted in cdnusers.org by pramod_si
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    At first it seems somewhat counterintuitive that a metal layer has a dielectric constant but the dielectric constrant of signal layers should be the same as that of the adjacent pre-preg layer. The pre-preg fills in the places where there is no copper on the routing layers and so the dielectric constant does make a difference in the impedance and prop delay values. It should be the same for plane layers even though it doesn't really matter if they are solid planes.


    Originally posted in cdnusers.org by Kalevi2
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