Coaxial Calculator Calculates the cutoff frequency, impedance and phase velocity of a coaxial transmission line. inner conductor outer diameter: mm outer conductor inner diameter: mm permittivity: legnth: mm frequency: GHz max. frequency: GHz \( Z_0 \) \( \mathrm{\Omega} \) \( v \) \(\frac{\mathrm{m}}{\mathrm{s}} \) \( \phi \) degrees