skrf.media.coaxial.Coaxial¶
 class skrf.media.coaxial.Coaxial(frequency=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 (number, arraylike, or None) – the port impedance for media. Only needed if its different from the characteristic impedance of the transmission line. if z0 is None then will default to Z0
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
 1
Pozar, D.M.; , “Microwave Engineering”, Wiley India Pvt. Limited, 1 sept. 2009
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, \(Z0\) 

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). 

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

Capacitor. 

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. 

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. 

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. 