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

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

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.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.

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