Local geometry defines the RF lineRogers vs Nelco vs Taconic vs Arlon: Construction & …. Engineering illustration, not a production photograph or test result.Local geometry defines the RF lineRogers vs Nelco vs Taconic vs Arlon: Construction & …Rogers vs Nelco vs Taconic vs Arlon: Construction & …Dielectric: use an appropriate model DkContinuous reference planeWidth WhAir / defined coverh is the distance to the reference plane, not total board thickness.