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

AnalyzedResult	Computed S-parameters, noise figure, OIP3, and group delay values
EpsilonR	Relative permittivity of dielectric
Height	Dielectric thickness
LineLength	Microstrip line length
LossTangent	Tangent of loss angle
Name	Object name
nPort	Number of ports
SigmaCond	Conductor conductivity
StubMode	Type of stub
Termination	Stub transmission line termination
Thickness	Microstrip thickness
Width	Parallel-plate width

Methods

analyze	Analyze circuit object in frequency domain
calculate	Calculate specified parameters for circuit object
circle	Draw circles on Smith chart
getz0	Characteristic impedance of transmission line object
listformat	List valid formats for specified circuit object parameter
listparam	List valid parameters for specified circuit object
loglog	Plot specified circuit object parameters using log-log scale
plot	Plot specified circuit object parameters on X-Y plane
plotyy	Plot specified object parameters with y-axes on both left and right sides
polar	Plot specified circuit object parameters on polar coordinates
semilogx	Plot specified circuit object parameters using log scale for x-axis
semilogy	Plot specified circuit object parameters using log scale for x-axis
smith	Plot specified circuit object parameters on Smith chart
write	Write 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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