Three dielectric values answer different questionsIt 200lk vs RO4350B: Construction & Cost Tradeoffs. Engineering illustration, not a production photograph or test result.Three dielectric values answer different questionsIt 200lk vs RO4350B: Construction & Cost TradeoffsProcess DkSupplier test methodMaterial controlDesign DkConstruction / methodCircuit model inputEffective DkLine + surroundingsPropagation resultKeep frequency, temperature, method and construction with each value.A test tolerance is not automatically a finished-circuit impedance tolerance.