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rfckt.cpw class

Package: rfckt

Coplanar waveguide transmission line

Syntax

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

Description

Use the cpw class to represent coplanar waveguide transmission lines that are characterized by line dimensions, stub type, and termination.

A coplanar waveguide transmission line is shown in cross-section in the following figure. Its physical characteristics include the conductor width (w), the conductor thickness (t), the slot width (s), the substrate height (d), and the permittivity constant (ε).

h = rfckt.cpw returns a coplanar waveguide transmission line object whose properties are set to their default values.

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

Properties

AnalyzedResultComputed S-parameters, noise figure, OIP3, and group delay values
ConductorWidthConductor width
EpsilonRRelative permittivity of dielectric
HeightDielectric thickness
LineLengthTransmission line length
LossTangentTangent of loss angle
NameObject name
nPortNumber of ports
SigmaCondConductor conductivity
SlotWidthWidth of slot
StubModeType of stub
TerminationStub transmission line termination
ThicknessConductor thickness

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.cpw('Thickness',0.0075e-6)
 
tx1 =
 
             Name: 'Coplanar Waveguide Transmission Line'
             nPort: 2
             AnalyzedResult: []
             LineLength: 0.0100
             StubMode: 'NotAStub'
             Termination: 'NotApplicable'
             ConductorWidth: 6.0000e-004
             SlotWidth: 2.0000e-004
             Height: 6.3500e-004
             Thickness: 7.5000e-009
             EpsilonR: 9.8000
             SigmaCond: Inf
             LossTangent: 0

References

[1] Gupta, K. C., R. Garg, I. Bahl, and P. Bhartia, Microstrip Lines and Slotlines, 2nd Edition, Artech House, Inc., Norwood, MA, 1996.

See Also

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