txlineLumped

Create lumped transmission line

Since R2023a

Description

Use the new txlineLumped object to design lumped-L and lumped-Pi transmission lines. You can also add a txlineLumped element to your rfbudget object, circuit object, or in the RF Budget Analyzer app and then export the lumped transmission line to RF Blockset™.

In a lumped-L transmission line you arrange the R, L,C, and G components in an L-network topology.

In a lumped-Pi transmission line, you arrange the R, L,C, and G components in a Pi-network topology.

Creation

Syntax

txl = txlineLumped

txl = txlineLumped(Name=Value)

Description

txl = txlineLumped creates a lumped transmission line object with default properties.

txl = txlineLumped(Name=Value) sets Properties of the lumped transmission line element using one or more name-value arguments. For example, txl = txlineLumped(R=75) sets the resistance per unit length to 75 ohms. Properties not specified retain their default values.

Properties

Name — Name of lumped transmission line element

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

Name of the lumped transmission line element, specified as a string scalar or a character vector.

Example: 'Lumped1'

Data Types: char | string

Type — Type of lumped transmission line element

'LumpedPi' (default) | 'LumpedL'

Type of the lumped transmission line element, specified as one of the following:

• 'LumpedPi' — Lumped-pi transmission line element

• 'LumpedL' — Lumped-l transmission line element

Example: 'LumpedL'

Data Types: char | string

Parameter — Parameterization type to model segments in transmission line

'Impedance' (default) | 'Inductance'

Parameterization type to model segments in the lumped transmission line element, specified as either 'Impedance' or 'Inductance'.

Example: 'Inductance'

Data Types: char | string

R — Resistance per unit length

0.300 (default) | positive scalar

Resistance per unit length of the lumped transmission line, specified as a positive scalar in ohms per meter.

Example: 0.5

Data Types: double

L — Inductance per unit length

2.35e-7 (default) | positive scalar

Inductance per unit length of the lumped transmission line, specified as a positive scalar in henries per meter.

Example: 2.3e-7

Dependencies

To set this property, set Parameter to 'Inductance'.

Data Types: double

C — Capacitance per unit length

9.4e-11 (default) | positive scalar

Capacitance per unit length of the lumped transmission line, specified as a positive scalar in farads per meter.

Example: 6.6e-11

Data Types: double

G — Conductance per unit length

5e-6 (default) | positive scalar

Conductance per unit length of the lumped transmission line, specified as a positive scalar in siemens per meter.

Example: 5.4e-6

Data Types: double

Z0 — Characteristic impedance of lumped transmission line

50 (default) | positive scalar

Characteristic impedance of the lumped transmission line, specified as a positive scalar in ohms.

Example: 75

Dependencies

To set this property, set Parameter to 'Impedance'.

Data Types: double

LineLength — Physical length of lumped transmission line

0.0100 (default) | positive scalar

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

Example: 0.0200

Data Types: double

NumPorts — Number of input and output ports

Read-only: 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 lumped transmission line

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

This property is read-only.

Terminals of the lumped 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, RF filter, 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

Examples

Create and Analyze Lumped Transmission Line

Create a lumped-L transmission line.

txl = txlineLumped(Type='LumpedL');

Calculate the S-parameters of the lumped-L transmission line.

sparam = sparameters(txl,2.1e9)

sparam = 
  sparameters with properties:

      Impedance: 50
       NumPorts: 2
     Parameters: [2×2 double]
    Frequencies: 2.1000e+09

Calculate the noise figure of the lumped-L transmission line.

nf = noisefigure(txl,2.1e9)

nf = 
2.1715e-05

Calculate the group delay of the lumped-L transmission line.

gd = groupdelay(txl,2.1e9)

gd = 
4.7000e-11

Calculate the characteristic impedance of the lumped-L transmission line.

zo = getZ0(txl,2.1e9)

zo = 
50

Version History

Introduced in R2023a