SIWLine

Create an SIW line in microstrip form

Since R2023b

Description

Use the SIWLine object to create a Substrate Integrated Waveguide (SIW) transmission line in microstrip form.

Creation

Syntax

line = SIWLine

line = SIWLine(Name=Value)

Description

line = SIWLine creates a default SIW line. Default substrate is Teflon with a thickness of 0.254e-3 m.

line = SIWLine(Name=Value) sets Properties using one or more name-value arguments. For example, SIWLine(Width=0.008) creates a line with width 0.008 m. Properties not specified retain their default values.

Properties

FeedLine — Shape of the SIW line's feed line

traceTapered (default) | traceRectangular

Feed line shape is specified as FeedLine.

Example: line.FeedLine = traceRectangular

Data Types: obj.shape

Length — Length of the SIW line in meters

0.0153 (default) | positive scalar

Length is specified as a positive scalar

Example: Line = SIWLine(Length = 0.02161)

Data Types: double

Width — Width of the SIW line in meters

0.0074 (default) | positive scalar

Width is specified as a positive scalar

Example: Line = SIWLine(Width = 0.0077)

Data Types: double

ViaSpacing — Spacing between vias as a two element vector [X-spacing Y-spacing] in meters

[1.2e-3 5.0e-3] (default) | positive vector

Via spacing is specified as a two element positive vector. X-spacing is the center-to-center spacing between adjacent vias in the X direction. Y-spacing is the center-to-center spacing between adjacent vias in the Y direction.

Example: Line = SIWLine(ViaSpacing = [1.3e-3 5.1e-3])

Data Types: double

ViaDiameter — Via diameter in meters

0.51e-3 (default) | positive scalar

Via diameter is specified as a positive scalar.

Example: Line = SIWLine(ViaDiamater = 0.49e-3)

Data Types: double

Height — Height of the SIW line from the ground plane in meters

0.254e-3 (default) | positive scalar

Height is specified as a positive scalar.

Example: Line = SIWLine(Height = 0.248)

Data Types: double

GroundPlaneWidth — Width of the ground plane in meters

0.0074 (default) | positive scalar

Ground plane width is specified as a positive scalar.

Example: Line = SIWLine(GroundPlaneWidth = 0.008)

Data Types: double

Conductor — Type of metal in conducting layers (accepts metal object)

PEC (default) | character

Conductor is specified as a metal object.

Example: line.Conductor = metal('Copper')

Data Types: string

Substrate — Type of substrate dielectric material (accepts dielectric object)

Teflon (default) | character

Substrate is specified as a dielectric object.

Example: line.Substrate = dielectric('FR4')

Data Types: string

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: 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].

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
dgs	Create defected ground structure of PCB element
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

Create SIW Transmission Line

Create and visualize default SIW transmission line

line = SIWLine

line = 
  SIWLine with properties:

            FeedLine: [1x1 traceTapered]
              Length: 0.0153
               Width: 0.0074
          ViaSpacing: [0.0012 0.0050]
         ViaDiameter: 5.1000e-04
              Height: 2.5400e-04
    GroundPlaneWidth: 0.0074
           Substrate: [1x1 dielectric]
           Conductor: [1x1 metal]
          IsShielded: 0

show(line)

SIW Transmission Line with Rectangular Feed Line

Create and visualize SIW transmission line with rectangular feed line

line = SIWLine;
line.FeedLine = traceRectangular("Length",3e-3,"Width",2e-3)

line = 
  SIWLine with properties:

            FeedLine: [1x1 traceRectangular]
              Length: 0.0153
               Width: 0.0074
          ViaSpacing: [0.0012 0.0050]
         ViaDiameter: 5.1000e-04
              Height: 2.5400e-04
    GroundPlaneWidth: 0.0074
           Substrate: [1x1 dielectric]
           Conductor: [1x1 metal]
          IsShielded: 0

show(line)

Version History

Introduced in R2023b