skrf.media.cpw.CPW

class skrf.media.cpw.CPW(frequency=None, z0=None, w=70, s=4, ep_r=3, t=None, rho=None, *args, **kwargs)

A Coplanar Waveguide.

This class was made from the technical documentation 1 provided by the qucs project 2 . The variables and properties of this class are coincident with their derivations.

Parameters

• frequency (Frequency object, optional) – frequency band of the media. The default is None.

• z0 (number, array-like, optional) – the port impedance for media. The default is None. Only needed if its different from the characteristic impedance of the transmission.

• w (number, or array-like, optional) – width of center conductor, in m. Default is 70.

• s (number, or array-like) – width of gap, in m. Default is 4.

• ep_r (number, or array-like, optional) – relative permativity of substrate. Default is 3.

• t (number, or array-like, optional) – conductor thickness, in m. Default is None (metalization thickness neglected)

• rho (number, or array-like, optional) – resistivity of conductor. Default is None

References

1

http://qucs.sourceforge.net/docs/technical.pdf

2

http://www.qucs.sourceforge.net/

Attributes

K_ratio	Intermediary parameter.
Z0	Characteristic impedance
alpha	Real (attenuation) component of gamma.
alpha_conductor	Losses due to conductor resistivity.
beta	Imaginary (propagating) component of gamma.
ep_re	Effective permittivity of the CPW (also known as Keff).
gamma	Propagation constant.
k1	Intermediary parameter.
npoints	Number of points of the frequency axis.
v_g	Complex group velocity (in m/s).
v_p	Complex phase velocity (in m/s).
z0	Characteristic Impedance.

Methods

__init__
attenuator	Ideal matched attenuator of a given length.
capacitor	Capacitor.
copy	Copy of this Media object.
delay_load	Delayed load.
delay_open	Delayed open transmission line.
delay_short	Delayed Short.
electrical_length	Calculate the complex electrical length for a given distance.
extract_distance	Determines physical distance from a transmission or reflection Network.
get_array_of
impedance_mismatch	Two-port network for an impedance mismatch.
inductor	Inductor.
isolator	Two-port isolator.
line	Transmission line of a given length and impedance.
load	Load of given reflection coefficient.
lossless_mismatch	Lossless, symmetric mismatch defined by its return loss.
match	Perfect matched load (\(\Gamma_0 = 0\)).
mode	Create another mode in this medium.
open	Open (\(\Gamma_0 = 1\)).
plot
random	Complex random network.
resistor	Resistor.
short	Short (\(\Gamma_0 = -1\))
shunt	Shunts a Network.
shunt_capacitor	Shunted capacitor.
shunt_delay_load	Shunted delayed load.
shunt_delay_open	Shunted delayed open.
shunt_delay_short	Shunted delayed short.
shunt_inductor	Shunted inductor.
splitter	Ideal, lossless n-way splitter.
tee	Ideal, lossless tee.
theta_2_d	Convert electrical length to physical distance.
thru	Matched transmission line of length 0.
to_meters	Translate various units of distance into meters.
white_gaussian_polar	Complex zero-mean gaussian white-noise network.
write_csv	write this media’s frequency, gamma, Z0, and z0 to a csv file.