splitterTee

Create T-junction power splitter

Since R2022b

Description

Use the splitterTee object to create a T-junction power splitter. The T-junction is a lossless and reciprocal three-port divider which divides the input equally between the two output ports.

To analyze the behavioral model for the T-junction power splitter, set the Behavioral property in sparameters to true or 1.

Creation

Syntax

splitter = splitterTee

splitter = splitterTee(PropertyName=Value)

Description

splitter = splitterTee creates a T-junction power splitter with default properties for a design frequency of 1.8 GHz.

splitter = splitterTee(PropertyName=Value) sets Properties using one or more name-value arguments. For example, splitterTee(PortLineLength=0.0155) creates a T-junction splitter with a port line length of 0.0155 meters. Properties not specified retain their default values.

Properties

Shape — Shape of T-junction splitter

'RectangularMitered' (default) | 'RectangularCurved' | 'Circular'

Shape of the T-junction splitter, specified as 'RectangularMitered', 'RectangularCurved', or 'Circular'.

Example: splitter = splitterTee(Shape='Circular')

Data Types: char

PortLineLength — Length of port line

0.0155 (default) | positive scalar

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

Example: splitter = splitterTee(PortLineLength=0.0144)

Data Types: double

PortLineWidth — Width of port line

0.0051 (default) | positive scalar

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

Example: splitter = splitterTee(PortLineWidth=0.0041)

Data Types: double

SplitLineLength — Length of split line

0.0320 (default) | positive scalar

Length of the split line in meters, specified as a positive scalar. Generally the length is λ/4 for a Tee splitter.

Example: splitter = splitterTee(SplitLineLength=0.0420)

Data Types: double

SplitLineWidth — Width of split line

0.0015 (default) | positive scalar

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

Example: splitter = splitterTee(SplitLineWidth=0.0025)

Data Types: double

BendMiterDiagonal — Length of miter diagonal at bend

0.0035 (default) | positive scalar

Length of the miter diagonal at the bend in meters, specified as a positive scalar.

Example: splitter = splitterTee(BendMiterDiagonal=0.0045)

Data Types: double

BendCurveRadius — Radius of curve at bend

0.0020 (default) | positive scalar

Radius of the curve at the bend in meters, specified as a positive scalar.

Example: splitter = splitterTee(BendCurveRadius=0.0030)

Dependencies

To enable this property, set the Shape property to 'RectangularCurved'.

Data Types: double

MatchLineLength — Length of match line

0.0315 (default) | positive scalar

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

Example: splitter = splitterTee(MatchLineLength=0.0415)

Data Types: double

MatchLineWidth — Width of match line

0.0029 (default) | positive scalar

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

Example: splitter = splitterTee(MatchLineWidth=0.0039)

Data Types: double

PortSpacing — Spacing between output ports

0.0320 (default) | positive scalar

Spacing between the output ports in meters, specified as a positive scalar.

Example: splitter = splitterTee(PortSpacing=0.0420)

Data Types: double

Height — Height of T-junction power splitter from ground plane

0.0016 (default) | positive scalar

Height of the T-junction power splitter 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 T-junction power splitter where the two dielectrics interface.

Example: splitter = splitterTee(Height=0.0076)

Data Types: double

GroundPlaneWidth — Width of ground plane

0.0847 (default) | positive scalar

Width of the ground plane in meters, specified as a positive scalar.

Example: splitter = splitterTee(GroundPlaneWidth=0.098)

Example: double

Substrate — Type of dielectric material

dielectric object

Type of dielectric material used as a substrate, specified as a dielectric object. The dielectric material in a splitterTee object with default properties in Teflon.

Example: d = dielectric("FR4"); splitter = splitterTee(Substrate=d)

Data Types: string | char

Conductor — Type of metal used in conducting layers

metal object

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

Example: m = metal("Copper"); splitter = splitterTee(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, see https://support.microsoft.com/en-us/windows/risks-of-allowing-apps-through-windows-defender-firewall-654559af-3f54-3dcf-349f-71ccd90bcc5c.

Data Types: boolian

Shielding — Metal shielding

Read-only: 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].

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
design	Design T-junction power splitter around specified frequency
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 Splitter Tee

Create a default splitter tee.

splitter = splitterTee

splitter = 
  splitterTee with properties:

                Shape: 'RectangularMitered'
       PortLineLength: 0.0155
        PortLineWidth: 0.0051
      SplitLineLength: 0.0320
       SplitLineWidth: 0.0015
    BendMiterDiagonal: 0.0035
      MatchLineLength: 0.0315
       MatchLineWidth: 0.0029
          PortSpacing: 0.0320
               Height: 0.0016
     GroundPlaneWidth: 0.0847
            Substrate: [1×1 dielectric]
            Conductor: [1×1 metal]
           IsShielded: 0

Visualize the splitter tee.

show(splitter)

S-Parameters of Curved Rectangular Splitter Tee

Create a curved rectangular splitter tee.

splitter = splitterTee(Shape='RectangularCurved')

splitter = 
  splitterTee with properties:

               Shape: 'RectangularCurved'
      PortLineLength: 0.0155
       PortLineWidth: 0.0051
     SplitLineLength: 0.0320
      SplitLineWidth: 0.0015
     BendCurveRadius: 0.0020
     MatchLineLength: 0.0315
      MatchLineWidth: 0.0029
         PortSpacing: 0.0320
              Height: 0.0016
    GroundPlaneWidth: 0.0847
           Substrate: [1×1 dielectric]
           Conductor: [1×1 metal]
          IsShielded: 0

Visualize the splitter tee.

show(splitter)

Calculate and plot the s-parameters of the tee at 3 GHz.

spar = sparameters(splitter,3e9)

spar = 
  sparameters with properties:

      Impedance: 50
       NumPorts: 3
     Parameters: [3×3 double]
    Frequencies: 3.0000e+09

rfplot(spar)

Multilayer Dielectric Splitter Tee

Create a splitter tee at the interface of a multilayer dielectric.

splitter = splitterTee;
splitter.Substrate = dielectric(Name={'Teflon','Teflon'},EpsilonR=[2.1 2.1], ...
    LossTangent=[0 0],Thickness=[0.8e-3 0.8e-3]);
splitter.Height = 0.8e-3;

Visualize the splitter tee.

show(splitter);

References

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

[2] Kumari, Chanchala, and Neela Chattoraj. “Design of an Elementary Microstrip Power Splitter for Antenna Array.” In 2021 National Conference on Communications (NCC), 1–5. Kanpur, India: IEEE, 2021. https://doi.org/10.1109/NCC52529.2021.9530097.

Version History

Introduced in R2022b

R2023b: Metal shielding for coplanar waveguide

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

R2022b: Behavioral Analysis for T-Junction Power Splitter

Use the sparameters function and the pcbElement object to perform the behavioral analysis of a T-junction power splitter.