transmission line

Coaxial Cable Impedance

Computes the characteristic impedance, cutoff frequency, capacitance per foot, inductance per foot, and velocity of propagation of a coaxial cable from the dielectric outer diameter, inner conductor diameter, and dielectric constant.

Inputs

Dielectric Outer Diameter

Outer diameter of the dielectric

Dielectric Outer Diameter Unit Multiplier

Unit multiplier — mm: 10, cm: 1, dm: 0.1, m: 0.01, km: 0.00001, in: 0.3937007874016, ft: 0.03280839895013, yd: 0.01093613298338

Inner Conductor Diameter

Diameter of the inner conductor

Inner Conductor Diameter Unit Multiplier

Unit multiplier — mm: 10, cm: 1, dm: 0.1, m: 0.01, km: 0.00001, in: 0.3937007874016, ft: 0.03280839895013, yd: 0.01093613298338

Dielectric Constant

Relative permittivity of the dielectric material (e.g. air=1, PTFE=2.1, polyethylene=2.3)

Results

⚠Dielectric Outer Diameter must be greater than Inner Conductor Diameter

Impedance—ΩCharacteristic impedance of the coaxial cable in ohms

Cutoff Frequency—GHzCutoff frequency of the coaxial cable in GHz

Capacitance—pF/ftDistributed capacitance per foot in picofarads

Inductance—nH/ftDistributed inductance per foot in nanohenries

Velocity of Propagation—%Velocity of propagation as a percentage of the speed of light