rfckt.twowire class

Package: rfckt

Two-wire transmission line

Syntax

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

Description

Use the twowire class to represent two-wire transmission lines that are characterized by line dimensions, stub type, and termination.

A two-wire transmission line is shown in cross-section in the following figure. Its physical characteristics include the radius of the wires a, the separation or physical distance between the wire centers S, and the relative permittivity and permeability of the wires. RF Toolbox™ software assumes the relative permittivity and permeability are uniform.

h = rfckt.twowire returns a two-wire transmission line object whose properties are set to their default values.

h = rfckt.twowire('Property1',value1,'Property2',value2,...) returns a two-wire transmission line object, h, with the specified properties. Properties that you do not specify retain their default values.

Construction

Properties

AnalyzedResultComputed S-parameters, noise figure, OIP3, and group delay values
EpsilonRRelative permittivity of dielectric
LineLengthTransmission line length
LossTangentTangent of loss angle
MuRRelative permeability of dielectric
NameObject name
nPortNumber of ports
RadiusWire radius
SeparationDistance between wires
SigmaCondConductor conductivity
StubModeType of stub
TerminationStub transmission line termination

Methods

analyzeAnalyze circuit object in frequency domain
calculateCalculate specified parameters for circuit object
circleDraw circles on Smith chart
getz0Characteristic impedance of transmission line 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
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

Examples

tx1=rfckt.twowire('Radius',7.5e-4)
 
tx1 =
 
            Name: 'Two-Wire Transmission Line'
            nPort: 2
            AnalyzedResult: []
            LineLength: 0.0100
            StubMode: 'NotAStub'
            Termination: 'NotApplicable'
            Radius: 7.5000e-004
            Separation: 0.0016
            MuR: 1
            EpsilonR: 2.3000
            LossTangent: 0
            SigmaCond: Inf

References

Pozar, David M. Microwave Engineering, John Wiley & Sons, Inc., 2005.

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