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

AnalyzedResult	Computed S-parameters, noise figure, OIP3, and group delay values
EpsilonR	Relative permittivity of dielectric
LineLength	Transmission line length
LossTangent	Tangent of loss angle
MuR	Relative permeability of dielectric
Name	Object name
nPort	Number of ports
Radius	Wire radius
Separation	Distance between wires
SigmaCond	Conductor conductivity
StubMode	Type of stub
Termination	Stub transmission line termination

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.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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