findElectromagneticProperties

(To be removed) Find electromagnetic material properties assigned to geometric region

Since R2021a

findElectromagneticProperties will be removed. Use the MaterialProperties property of femodel instead. (since R2023a) For more information on updating your code, see Version History.

Syntax

emProperties = findElectromagneticProperties(materialProperties,RegionType,RegionID)

Description

emProperties = findElectromagneticProperties(materialProperties,RegionType,RegionID) returns the electromagnetic material properties assigned to the specified region of the specified model.

Examples

Find Relative Permittivity for Faces of 2-D Geometry

Create an electromagnetic model for an electrostatic analysis.

emagmodel = createpde("electromagnetic","electrostatic");

Include the L-shaped membrane geometry in the model and plot it with the face labels.

geometryFromEdges(emagmodel,@lshapeg);
pdegplot(emagmodel,"FaceLabels","on")
ylim([-1.1 1.1])
axis equal

Specify the vacuum permittivity value in the SI system of units.

emagmodel.VacuumPermittivity = 8.8541878128E-12;

Specify a different value of relative permittivity for each face.

electromagneticProperties(emagmodel,"RelativePermittivity",2.5, ...
                                    "Face",1);
electromagneticProperties(emagmodel,"RelativePermittivity",2.25, ...
                                    "Face",2);
electromagneticProperties(emagmodel,"RelativePermittivity",1, ...
                                    "Face",3);

Check the electromagnetic material properties specification for each face.

findElectromagneticProperties(emagmodel.MaterialProperties,"Face",1)

ans = 
  ElectromagneticMaterialAssignment with properties:

              RegionType: 'Face'
                RegionID: 1
    RelativePermittivity: 2.5000
    RelativePermeability: []
            Conductivity: []

findElectromagneticProperties(emagmodel.MaterialProperties,"Face",2)

ans = 
  ElectromagneticMaterialAssignment with properties:

              RegionType: 'Face'
                RegionID: 2
    RelativePermittivity: 2.2500
    RelativePermeability: []
            Conductivity: []

findElectromagneticProperties(emagmodel.MaterialProperties,"Face",3)

ans = 
  ElectromagneticMaterialAssignment with properties:

              RegionType: 'Face'
                RegionID: 3
    RelativePermittivity: 1
    RelativePermeability: []
            Conductivity: []

Input Arguments

materialProperties — Material properties of electromagnetic model

MaterialProperties property

Material properties of an electromagnetic model, specified as the MaterialProperties property of the model.

Example: emagmodel.MaterialProperties

RegionType — Geometric region type

"Face" for a 2-D model | "Cell" for a 3-D model

Geometric region type, specified as "Face" for a 2-D geometry or "Cell" for a 3-D geometry.

Data Types: char | string

RegionID — Region ID

vector of positive integers

Region ID, specified as a vector of positive integers. Find the face or cell IDs by using pdegplot with the "FaceLabels" or "CellLabels" name-value argument set to "on".

Data Types: double

Output Arguments

emProperties — Material properties assignment

ElectromagneticMaterialAssignment object

Material properties assignment, returned as an ElectromagneticMaterialAssignment object. For more information, see ElectromagneticMaterialAssignment Properties.

Version History

Introduced in R2021a

R2025a: To be removed

findElectromagneticProperties will be removed. Use the MaterialProperties property of femodel instead.

For example, you can check the electromagnetic properties of the block as follows.

model = femodel(AnalysisType="electrostatic", ...
                Geometry=@lshapeg);
model.MaterialProperties(1) = ...
  materialProperties(RelativePermittivity=2.5);
model.MaterialProperties(2) = ...
  materialProperties(RelativePermittivity=2.25);
model.MaterialProperties(3) = ...
  materialProperties(RelativePermittivity=1);
model.MaterialProperties

The unified finite element model workflow defines the type of a problem and all of its parameters as the properties of an femodel object. This object enables you to specify physical parameters for structural, thermal, and electromagnetic types of analyses. The solver in the unified workflow uses only the parameters (properties) appropriate for the current analysis type while ignoring all other properties. If you switch the analysis type by setting the AnalysisType property of the model, the solver uses the appropriate set of properties corresponding to the new analysis type.

For more help migrating your existing code that uses ElectromagneticModel to the unified finite element workflow, see Migration from Domain-Specific to Unified Workflow.