rfckt.passive class

Package: rfckt

Passive component or network


h = rfckt.passive
h = rfckt.passive('Property1',value1,'Property2',value2,...)


Use the passive class to represent passive RF components and networks that are characterized by passive network parameter data.

h = rfckt.passive returns an passive-device object whose properties all have their default values.

h = rfckt.passive('Property1',value1,'Property2',value2,...) returns a circuit object, h, based on the specified properties. Properties that you do not specify retain their default values.

Use the read method to read the passive object data from a Touchstone data file. When you read S-parameter data into an rfckt.passive object, the magnitude of your S21 data must be less than or equal to 1.

Due to random numerical error, data measured from a passive device is not necessarily passive. However, rfckt.passive objects can only contain passive data. To import data with active regions, use the rfckt.amplifier object, even if the original data represents a passive device.


AnalyzedResultComputed S-parameters, noise figure, OIP3, and group delay values
IntpTypeInterpolation method
NameObject name
NetworkDataNetwork parameter information
nPortNumber of ports


analyzeAnalyze circuit object in frequency domain
calculateCalculate specified parameters for circuit object
circleDraw circles on Smith chart
extractExtract array of network parameters from data object
listformatList valid formats for specified circuit object parameter
listparamList valid parameters for specified circuit object
loglogPlot specified circuit object parameters using log-log scale
plotPlot specified circuit object parameters on X-Y plane
plotyyPlot specified object parameters with y-axes on both left and right sides
polarPlot specified circuit object parameters on polar coordinates
readRead RF data from file to new or existing circuit or data object
restoreRestore data to original frequencies
semilogxPlot specified circuit object parameters using log scale for x-axis
semilogyPlot specified circuit object parameters using log scale for x-axis
smithPlot specified circuit object parameters on Smith chart
writeWrite RF data from circuit or data object to file


pas = rfckt.passive('IntpType','cubic')

pas =
            Name: 'Passive'
            nPort: 2
            AnalyzedResult: [1x1 rfdata.data]
            IntpType: 'Cubic'
            NetworkData: [1x1 rfdata.network]


EIA/IBIS Open Forum, Touchstone File Format Specification, Rev. 1.1, 2002 (http://www.vhdl.org/pub/ibis/connector/touchstone_spec11.pdf).

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