Separate the contributors to measured insertion lossRO4000 LoPro processing guidelines: Source & Enginee…. Engineering illustration, not a production photograph or test result.Separate the contributors to measured insertion lossRO4000 LoPro processing guidelines: Source & Enginee…Input launchConductorDielectricOutput launchMismatch and radiation can also reduce transmitted power.The dielectric-only calculator models just one contribution.Define measurement reference planes before comparing two boards.