Local geometry defines the RF lineIt 200lk vs RO4350B: Construction & Cost Tradeoffs. Engineering illustration, not a production photograph or test result.Local geometry defines the RF lineIt 200lk vs RO4350B: Construction & Cost TradeoffsIt 200lk vs RO4350B: Construction & Cost TradeoffsDielectric: use an appropriate model DkContinuous reference planeWidth WhAir / defined coverh is the distance to the reference plane, not total board thickness.