filterSpurline

Create spurline bandstop filter in microstrip from

Since R2023a

Description

Use the filterSpurline object to create a spurline bandstop filter in the microstrip form.

Creation

Syntax

filter = filterSpurline

filter = filterSpurline(Name=Value)

Description

filter = filterSpurline creates a spurline bandstop filter with default properties for a frequency of 3.743 GHz.

filter = filterSpurline(Name=Value) sets Properties using one or more name-value arguments. For example, filterSpurline(LineType='Double') creates a spurline bandstop filter with two lines. Properties not specified retain their default values.

Properties

LineType — Type of spurline

'Single' (default) | 'Double'

Type of spurline, specified as 'Single' or 'Double'.

Example: filter = filterSpurline(LineType='Double')

Data Types: char

CoupledLineLength — Length of coupled line

0.0146 (default) | positive scalar

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

Example: filter = filterSpurline(CoupledLineLength = 0.0156)

Data Types: double

CoupledLineWidth — Width of coupled line

4.0000e-04 (default) | positive scalar

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

Example: filter = filterSpurline(CoupledLineWidth = 0.0008)

Data Types: double

CoupledLineSpacing — Spacing between coupled line

4.0000e-04 (default) | positive scalar

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

Example: filter = filterSpurline(CoupledLineSpacing = 0.0008)

Data Types: double

LineGap — Gap between coupled line and output line

4.0000e-04 (default) | positive scalar

Gap between the coupled line and the output line in meters, specified as a positive scalar.

Example: filter = filterSpurline(LineGap = 0.0008)

Data Types: double

PortLineLength — Length of input and output line

0.0075 (default) | positive scalar

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

Example: filter = filterSpurline(PortLineLength = 0.0095)

Data Types: double

PortLineWidth — Width of input and output line

0.0021 (default) | positive scalar

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

Example: filter = filterSpurline(PortLineWidth = 0.0041)

Data Types: double

Height — Height from ground plane to filter

7.6000e-04 (default) | positive scalar

Height from the ground plane to the filter in meters, specified as a positive scalar.

Example: filter = filterSpurline(Height = 0.00096)

Data Types: double

GroundPlaneWidth — Height from ground plane to filter

0.0120 (default) | positive scalar

Height from the ground plane to the filter in meters specified as a positive scalar.

Example: filter = filterSpurline(GroundPlaneWidth = 0.00096)

Data Types: 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 filterSpurline object has the default properties: (Name={'AD260A'},EpsilonR=2.6,LossTangent=0.001,Thickness=0.76e-3).

.

Example: d = dielectric("FR4"); coupler = filterSpurline(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 metal used in the conducting layers of filterSpurline object with default properties is PEC.

Example: m = metal("Copper"); coupler = filterSpurline(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: 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
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

Spurline Filter with Default Values

Create a spurline filter with default properties.

filter = filterSpurline

filter = 
  filterSpurline with properties:

              LineType: 'Single'
     CoupledLineLength: 0.0146
      CoupledLineWidth: 4.0000e-04
    CoupledLineSpacing: 4.0000e-04
               LineGap: 4.0000e-04
        PortLineLength: 0.0075
         PortLineWidth: 0.0021
                Height: 7.6000e-04
      GroundPlaneWidth: 0.0120
             Substrate: [1x1 dielectric]
             Conductor: [1x1 metal]
            IsShielded: 0

Visualize the filter.

show(filter)

Spurline Filter with Two Lines

Create a spurline filter with two lines.

filter = filterSpurline('LineType','double');

Visualize the filter.

show(filter); 

References

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

Version History

Introduced in R2023a

R2023b: Metal shielding for spurline filter

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