Local geometry defines the RF lineRogers PCB vs FR-4: an engineering comparison. Engineering illustration, not a production photograph or test result.Local geometry defines the RF lineRogers PCB vs FR-4: an engineering comparisonRogers PCB vs FR-4: an engineering comparisonDielectric: use an appropriate model DkContinuous reference planeWidth WhAir / defined coverh is the distance to the reference plane, not total board thickness.