rfckt.microstrip class

Package: rfckt

Microstrip transmission line

Syntax

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

Description

Use the microstrip class to represent microstrip transmission lines that are characterized by line dimensions and optional stub properties.

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

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

h = rfckt.microstrip('Property1',value1,'Property2',value2,...) returns a microstrip 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
EpsilonRRelative permittivity of dielectric
HeightDielectric thickness
LineLengthMicrostrip line length
LossTangentTangent of loss angle
NameObject name
nPortNumber of ports
SigmaCondConductor conductivity
StubModeType of stub
TerminationStub transmission line termination
ThicknessMicrostrip thickness
WidthParallel-plate width

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.microstrip('Thickness',0.0075e-6)
 
tx1 =
 
            Name: 'Microstrip Transmission Line'
            nPort: 2
            AnalyzedResult: []
            LineLength: 0.0100
            StubMode: 'NotAStub'
            Termination: 'NotApplicable'
            Width: 6.0000e-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.

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