balunMarchand

Create Marchand balun in microstrip form

Since R2022b

Description

Use the balunMarchund object to create a Marchand balun in the microstrip form with an unbalanced and balanced output. There is a 180 degrees phase difference between the input and the output ports.

Baluns are used to connect an unbalanced source line to a balanced load or vice-versa enabling you to create a matching transition between balanced and unbalanced transmission lines. A Marchand balun has a pair of quarter-wavelength coupled lines of quarter wavelength for dividing and combining signals with the same amplitude and opposite phase.

Creation

Syntax

balun = balunMarchand

balun = balunMarchand(Name=Value)

Description

balun = balunMarchand creates a Marchand balun in the microstrip form with default properties for a resonant frequency of 2.2 GHz.

balun = balunMarchand(Name=Value) sets Properties using one or more name-value arguments. For example, balunMarchand(OutputLineLength=0.016) creates a Marchand balun with an output line length of 0.016 meters. Properties not specified retain their default values.

Properties

CoupledLineLength — Length of coupled line

0.0178 (default) | positive scalar

Length of the coupled line in meters, specified as a positive scalar.

Example: balun = balunMarchand(CoupledLineLength=0.0254)

Data Types: double

CoupledLineWidth — Width of coupled line

0.0003 (default) | positive scalar

Width of the coupled line in meters, specified as a positive scalar.

Example: balun = balunMarchand(CoupledLineWidth=0.0005)

Data Types: double

CoupledLineSpacing — Spacing between coupled lines

1.5e-04 (default) | positive scalar

Spacing between the coupled lines in meters, specified as a positive scalar.

Example: balun = balunMarchand(CoupledLineSpacing=0.00014)

Data Types: double

OutputLineLength — Length of output line

0.016 (default) | positive scalar

Length of the output line in meters, specified as a positive scalar.

Example: balun = balunMarchand(OutputLineLength=0.0224)

Data Types: double

OuputLineWidth — Width of output line

2.9e-04 (default) | positive scalar

Width of the output line in meters, specified as a positive scalar.

Example: balun = balunMarchand(OutputLineWidth=0.000253)

Data Types: double

Height — Height of Marchand balun from ground plane

0.0016 (default) | positive scalar

Height of the Marchand balun from the ground plane in meters, specified as a positive scalar.

In the case of a multilayer substrate, you can use the Height property to create a Marchand balun where the two dielectrics interface.

Example: balun = balunMarchand(Height=0.022)

Data Types: double

Substrate — Type of dielectric material

dielectric object

Type of dielectric material used as a substrate, specified as a dielectric object. The default height of the substrate is 0.0013 meters. The dielectric material in a balunMarchand object with default properties is FR4.

Example: d = dielectric("RTDuriod"); balun =balunMarchand(Substrate=d)

Conductor — Type of metal used in conducting layers

metal object

Type of metal used in the conducting layers, specified as a metal object. The type of metal in a balunMarchand object with default properties is PEC.

Example: m = metal("Copper"); balun =balunMarchand(Conductor=m)

Data Types: string | char

IsShielded — Flag to add metal shielding

false or 0 (default) | true or 1

Flag to add a metal shielding to the PCB component, specified as a logical 0 or logical 1. The default value is logical 0.

Example: IsShielded = true or 1 add a metal shield.

Note

To enable FEM solver required for the metal shield property, download the Integro-Differential Modeling Framework for MATLAB. To download this add-on:

1. In the Home tab Environment section, click on Add-Ons. This opens the add-on explorer. You need an active internet connection to download the add-on.

2. Search for Integro-Differential Modeling Framework for MATLAB and click Install.

3. To verify if the download is successful, run

   matlab.addons.installedAddons

   in your MATLAB^® session command line.

4. On Windows, to run the IDMF add-on, you must install the Windows Subsystem for Linux (WSL). To install WSL, see Install Linux on Windows with WSL.

   The Windows Defender Firewall can block the PostgreSQL server when using the IDMF add-on. To resolve this issue, you can allow the server to communicate on desired networks if the firewall prompts. Alternatively, you can manually add the executable file of the PostgreSQL server located in <matlabroot>\sys\postgresql\win64\PostgreSQL\bin\postgres.exe. For more information regarding firewalls, see Allowing apps through Windows Defender Firewall .

Data Types: logical

Shielding — Metal shielding

shape.Box object

This property is read-only.

Metal shield for the PCB component, specified as a shape.Box object. The length and width of the box must be equal to the length and width of the ground plane. The center of the box is at [0 0 Shielding.Height]. You can modify the property after creating the object.

Dependencies

To enable the Shielding property, set the IsShielded property to true or 1.

Connector — Type of RF connector

RFConnector object

Type of RF connector assembled at the feed locations of the PCB component, specified as a RFConnector object.

Example: Create connector from RFConnector object like this: coaxial = RFConnector adds a coaxial connector.

Dependencies

To enable the Connector property, set the IsShielded property to true or 1.

Object Functions

charge	Calculate and plot charge distribution
current	Calculate and plot current distribution
feedCurrent	Calculate current at feed port
layout	Plot all metal layers and board shape
mesh	Change and view mesh properties of metal or dielectric in PCB component
shapes	Extract all metal layer shapes of PCB component
show	Display PCB component structure or PCB shape
sparameters	Calculate S-parameters for RF PCB objects
RFConnector	Create RF connector

Examples

Default Marchand Balun

Create a default Marchand balun.

balun = balunMarchand

balun = 
  balunMarchand with properties:

     CoupledLineLength: 0.0178
      CoupledLineWidth: 0.0030
    CoupledLineSpacing: 1.5000e-04
      OutputLineLength: 0.0160
       OutputLineWidth: 2.9000e-04
                Height: 0.0016
             Substrate: [1x1 dielectric]
             Conductor: [1x1 metal]

View the balun.

show(balun)

Multilayer Dielectric Marchand Balun

Create a Marchand balun.

balun = balunMarchand;
balun.Height =  0.0016;

Create a multilayer dielectric of FR4 and Teflon.

sub = dielectric('FR4','Teflon');
sub.Thickness =[0.0016 0.0008];
balun.Substrate = sub;
figure;

View the balun.

show(balun);

References

[1] Pozar, David M. Microwave Engineering. 4th ed. Hoboken, NJ: Wiley, 2012.

Version History

Introduced in R2022b

R2023b: Metal Shielding for Marchand Balun

Use the IsShielded, Shielding, and Connector properties to add a metal shield to the balunMarchand object.