Line

rfnetwork.elements.Line

class rfnetwork.elements.Line(z0=50, er=1, loss=0, frequency=0, length=None, shunt=False, state={})

Bases: Component

Base class for generic transmission lines.

Parameters

z0float | list, default: 50: Characteristic impedance of line.
erfloat | list, default: 1: Dielectric constant of substrate.
lossfloat | list, default: 0: Total loss, (dielectric + conductor) losses, in dB per inch.
frequencylist, optional: Array of frequencies in Hz for z0, er, and loss if they are provided as lists.
lengthfloat, optional: Length of line segment in inches.
shuntbool, default: False: If True, port 2 is connected to ground and port 1 is transformed into a 2-port component that can be cascaded with other components.

Examples

>>> import rfnetwork as rfn
>>> ln = rfn.elements.Line( 
...    z0=55,
...    er=[3.2, 3.5],
...    loss=[0.5, 0.7],
...    frequency=[10e9, 12e9],
...    length=1.5,
... )
>>> ln.state
{'length': 1.5, 'z0': 55, 'er': [3.2, 3.5], 'loss': [0.5, 0.7]}

If setting the length with the electrical length, keep in mind that it is relative to a wavelength in the medium, not in free space.

>>> ln1 = ln(360, f0=10e9)
>>> ln1.state["length"]
0.6597...

Whereas a wavelength in free space is,

>>> rfn.const.c0_in / 10e9
1.1802...

Methods

`Line.evaluate_sdata`(frequency)	Computes the lossy s-matrix of a transmission line.
`Line.get_delay`(frequency)	Returns the phase delay [deg] and time delay [ps] at the specified frequency.
`Line.get_properties`(frequency)	Returns characteristic impedance and dielectric constant over frequency.
`Line.get_wavelength`(frequency[, units])	Returns the propagation wavelength [inches] of the medium at the specified frequency [Hz].

Attributes