skrf.media.coaxial.Coaxial
 class skrf.media.coaxial.Coaxial(frequency=None, z0_port=None, z0_override=None, z0=None, Dint=0.00081, Dout=0.005, epsilon_r=1, tan_delta=0, sigma=1e+99, *args, **kwargs)[source]
A coaxial transmission line defined in terms of its inner/outer diameters and permittivity.
 Parameters:
frequency (
Frequency
object) – Frequency band.z0_port (number, arraylike, or None) – z0_port is the port impedance for networks generated by the media. If z0_port is not None, the networks generated by the media are renormalized (or in other words embedded) from the characteristic impedance z0 of the media to z0_port. Else if z0_port is None, the networks port impedances will be the raw characteristic impedance z0 of the media. (Default is None)
z0_override (number, arraylike, or None) – z0_override override the characteristic impedance for the media. If z0_override is not None, the networks generated by the media have their characteristic impedance z0 overrided by z0_override. (Default is None)
z0 (number, arraylike, or None) – deprecated parameter, alias to z0_override if z0_override is None. Emmit a deprecation warning.
Dint (number, or arraylike) – inner conductor diameter, in m
Dout (number, or arraylike) – outer conductor diameter, in m
epsilon_r (number, or arraylike, optional) – relative permittivity of the dielectric medium. Default is 1.
tan_delta (number, or arraylike, optional) – loss tangent of the dielectric medium. Default is 0.
sigma (number, or arraylike, optional.) – conductors electrical conductivity, in S/m. Default is infinity (non lossy metal).
TODO : different conductivity in case of different conductor kind
Note
Dint, Dout, epsilon_r, tan_delta, sigma can all be vectors as long as they are the same length
References
Attributes
Distributed capacitance C, in F/m 

Distributed conductance G, in S/m 

Distributed inductance L, in H/m 

Distributed resistance R, in Ohm/m. 

Surface resistivity in Ohm/area. 

Distributed Admittance, \(Y^{'}\). 

Distributed Impedance, \(Z^{'}\). 

Characteristic Impedance 

Inner radius of the coaxial line 

Real (attenuation) component of gamma. 

Outer radius of the coaxial line 

Imaginary (propagating) component of gamma. 

Propagation Constant, \(\gamma\). 

Number of points of the frequency axis. 

Complex group velocity (in m/s). 

Complex phase velocity (in m/s). 

Return Characteristic Impedance z0_characteristic. 

Characteristic Impedance, \(z_0\) 

Port Impedance. 

Port Impedance. 
Methods
Ideal matched attenuator of a given length. 

Capacitor. 

Capacitor with Q factor. 

Copy of this Media object. 

Delayed load. 

Delayed open transmission line. 

Delayed Short. 

Calculate the complex electrical length for a given distance. 

Determines physical distance from a transmission or reflection Network. 

Init from characteristic impedance and outer diameter. 

Init from electrical properties of the line: attenuation and velocity factor. 

Create a DistributedCircuit from numerical values stored in a csv file. 

Initializes a DistributedCircuit from an existing 

Twoport network for an impedance mismatch. 

Inductor. 

Inductor with Q factor. 

Twoport isolator. 

Transmission line of a given length and impedance. 

Load of given reflection coefficient. 

Lossless, symmetric mismatch defined by its return loss. 

Perfect matched load (\(\Gamma_0 = 0\)). 

Create another mode in this medium. 

Open (\(\Gamma_0 = 1\)). 

Complex random network. 

Resistor. 

Short (\(\Gamma_0 = 1\)) 

Shunts a 

Shunted capacitor. 

Shunted delayed load. 

Shunted delayed open. 

Shunted delayed short. 

Shunted inductor. 

Shunted resistor. 

Ideal, lossless nway splitter. 

Ideal, lossless tee. 

Convert electrical length to physical distance. 

Matched transmission line of length 0. 

Translate various units of distance into meters. 

Complex zeromean gaussian whitenoise network. 

write this media's frequency, gamma, Z0, and z0 to a csv file. 