{{Note|[[EM.Tempo]] is You can convert the values of attenuation constant from Np/m to dB/m using the relationship: 1Np = 8.6859dB.}}
{{Note | Proper grounding of the transmission line devices is critical for a successful simulation.}}
Another practical need in RF design is to quarter-wavelength line segments. In this case, you must calculate the guide wavelength of the transmission line as defined by λ<sub>g</sub> = λ<sub>0</sub> / √ε<sub>eff</sub>, where λ<sub>0</sub> = c/f is the free space wavelength at the operational frequency.