skrf.media.freespace.Freespace

class skrf.media.freespace.Freespace(frequency, ep_r=1, mu_r=1, *args, **kwargs)

Represents a plane-wave in a homogeneous freespace, defined by the space’s relative permativity and relative permeability.

The field properties of space are related to a disctributed circuit transmission line model given in circuit theory by:

Circuit Property	Field Property
distributed_capacitance	real(ep_0*ep_r)
distributed_resistance	imag(ep_0*ep_r)
distributed_inductance	real(mu_0*mu_r)
distributed_conductance	imag(mu_0*mu_r)

This class’s inheritence is;

Media-> DistributedCircuit-> Freespace

Attributes

Y	Distributed Admittance,
Z	Distributed Impedance,
characteristic_impedance	Characterisitc impedance
propagation_constant	Propagation constant
z0	Port Impedance

Methods

Z0	Characteristic Impedance,
__init__	Freespace initializer
capacitor	Capacitor
delay_load	Delayed load
delay_open	Delayed open transmission line
delay_short	Delayed Short
electrical_length	calculates the electrical length for a given distance, at
from_Media	Initializes a DistributedCircuit from an existing
from_csv	create a Media from numerical values stored in a csv file.
gamma	Propagation Constant,
guess_length_of_delay_short	Guess physical length of a delay short.
impedance_mismatch	Two-port network for an impedance miss-match
inductor	Inductor
line	Matched transmission line of given length
load	Load of given reflection coefficient.
match	Perfect matched load ().
open	Open ()
resistor	Resistor
short	Short ()
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	Converts electrical length to physical distance.
thru	Matched transmission line of length 0.
white_gaussian_polar	Complex zero-mean gaussian white-noise network.
write_csv	write this media’s frequency, z0, and gamma to a csv file.