txlineParallelPlate

Create parallel-plate transmission line

Since R2020b. Recommended over rfckt.parallelplate.

Description

Use the txlineParallelPlate object to create a parallel-plate transmission line. A cross-section of a parallel-plate transmission line is shown this figure. The physical characteristics of the parallel-plate transmission line include the plate width and the plate separation.

Creation

Syntax

paralleltxline = txlineParallelPlate

paralleltxline = txlineParallelPlate(Name,Value)

Description

paralleltxline = txlineParallelPlate creates a parallel-plate transmission line object.

paralleltxline = txlineParallelPlate(Name,Value) sets properties using one or more name-value pairs. For example, txline = txlineParallelPlate('Separation',0.0046) creates a parallel-plate transmission line with a separation of 0.0046 meters.

Properties

Name — Name of parallel-plate transmission line

'parallelplate' (default) | string scalar | character vector

Name of the parallel-plate transmission line, specified as a string scalar or a character vector.

Example: 'Name','parallelplate1'

Example: paralleltxline.Name = 'parallelplate1'

Data Types: char | string

LineLength — Physical length

'0.0100' (default) | positive scalar

Physical length of the transmission line, specified as a positive scalar in meters.

Example: 'LineLength',0.0200

Example: paralletxline.LineLength = 0.0200

Data Types: double

Width — Physical width

0.0050 (default) | positive scalar

Physical width of the transmission line, specified as a positive scalar in meters.

Example: 'Width',0.00200

Example: paralleltxline.Width = 0.00200

Data Types: double

Separation — Thickness of dielectric

0.001 (default) | positive scalar

Thickness of dielectric, specified as a positive scalar in meters.

Example: 'Separation',0.007

Example: paralleltxline.Separation = 0.007

Data Types: double

MuR — Relative permeability of dielectric

1 (default) | positive scalar

Relative permeability of a dielectric, specified as a positive scalar.

The ratio of permeability of dielectric, μ, to the permeability in free space, μ₀.

Example: 'MuR',1.5

Example: paralleltxline.MuR = 1.5

Data Types: double

EpsilonR — Relative permittivity of dielectric

2.3 (default) | positive scalar

Relative permittivity of the dielectric, specified as a positive scalar in Farad per meter (F/m).

Example: 'EpsilonR',3.3

Example: paralleltxline.EpsilonR = 3.3

Data Types: double

LossTangent — Loss angle tangent of dielectric

0 (default) | nonnegative scalar

Loss angle tangent of the dielectric, specified as a nonnegative scalar.

Example: 'LossTangent',1

Example: paralleltxline.LossTangent = 1

Data Types: double

SigmaCond — Conductivity of conductor

Inf (default) | positive scalar

Conductivity of the conductor, specified as a positive scalar in Siemens per meter (S/m).

Example: 'SigmaCond',2

Example: paralleltxline.SigmaCond = 2

Data Types: double

Termination — Stub transmission line termination

'NotApplicable' (default) | 'Open' | 'Short'

Stub transmission line termination, specified as 'NotApplicable', 'Open', or 'Short'.

Example: 'Termination','Short'

Example: paralleltxline.Termination = 'Short'

Data Types: char

StubMode — Type of stub

'NotAStub' (default) | 'Series' | 'Shunt'

Type of stub, specified as 'NotAStub', 'Series', or 'Shunt'.

Example: 'StubMode','Series'

Example: paralleltxline.StubMode = 'Series'

Data Types: char

NumPorts — Number of input and output ports

2 (default) | positive scalar

This property is read-only.

Number of input and output ports, specified as positive scalar.

Data Types: double

Terminals — Terminals of coaxial transmission line

{'p1+' p2+' 'p1-' 'p2-'} (default) | cell array of strings

This property is read-only.

Terminals of coaxial transmission line, specified as a cell array of strings.

Data Types: char | string

Object Functions

sparameters	Calculate S-parameters for RF data, network, circuit, and matching network objects
groupdelay	Group delay of S-parameter object or RF filter object or RF Toolbox circuit object
noisefigure	Calculate noise figure of transmission lines, series RLC, and shunt RLC circuits
getZ0	Calculate characteristic impedance with and without dispersion for transmission line
circuit	Circuit object
clone	Create copy of existing circuit element or circuit object

Examples

S-Parameters of Parallel-Plate Transmission Line

Create a parallel-plate transmission line using these specifications:

• Width : 300 mm

• Separation between plates : 10 mm

• EpsilonR : 4.2 F/m

parallelplatetxline = txlineParallelPlate('Width',300e-3,'Separation',10e-3,'EpsilonR',4.2)

parallelplatetxline = 
  txlineParallelPlate: ParallelPlate element

           Name: 'ParallelPlate'
          Width: 0.3000
     Separation: 0.0100
            MuR: 1
       EpsilonR: 4.2000
    LossTangent: 0
      SigmaCond: Inf
     LineLength: 0.0100
    Termination: 'NotApplicable'
       StubMode: 'NotAStub'
       NumPorts: 2
      Terminals: {'p1+'  'p2+'  'p1-'  'p2-'}

Calculate the S-parameters of the transmission line at 6 GHz.

sparam = sparameters(parallelplatetxline,6e9);

Version History

Introduced in R2020b

R2023b: Recommended over rfckt.parallelplate

txlineParallelPlate is recommended over rfckt.parallelplate because it enables you to:

• Create a parallel-plate transmission line.

• Build a circuit object with a parallel-plate transmission line.

• Model a parallel-plate transmission line element in an RF chain created using an rfbudget object or the RF Budget Analyzer app, and then export this element to RF Blockset™ or to rfsystem System object™ for circuit envelope analysis.