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A boundary condition that allows you to model only a portion of a structure. Electromagnetically equivalent non-symmetry boundary conditions are also available but the symmetry version accounts for the portion of the structure you are modeling and therefore corrects for overall energy and other things that can impact results, such as field magnitudes.

Simulator Applicability

3D Driven Frequency (RF3p)

2D Eigenmode (OM2p)

3D Eigenmode (OM3p)

Common Uses

To reduce the computational resources necessary to simulate a structure.


Must be applied only to exterior faces.

Must be applied only to planar faces.

Must be applied to less than three planes.

Must not be applied on two parallel planes even if they are offset in a normal direction.

Multiple planes do not have to be orthogonal to each other, but only one pair of planes is allowed to be non-orthogonal.

For Driven Frequency 3D (RF3p), symmetry planes must cut all ports and cannot be used to mirror or duplicate ports.


If the combination of planes is too complex for the simulator to compute a volume fraction, a warning is generated and symmetry is then ignored in field normalization and mode parameter calculations.


Label - A unique name that identifies the attribute. (IAttribute/Label)

Color - Color used on objects to which this attribute is applied. (IAttribute/Color)

Type - Type of electromagnetic symmetry to enforce. The choices may be simulator specific. (ISymmetry/Type)

  • Electric - Forces the electric field to be tangential to the surface (equivalent to Perfect H).

  • Magnetic - Forces the electric field to be perpendicular to the surface (equivalent to Perfect E).

Example Creation Script

Symmetry_1 = AttributeSet_1.NewBoundaryCondition("OM_Symmetry", "Symmetry_1")

Symmetry_1 = AttributeSet_1.NewBoundaryCondition("RF_MSymmetry", "Symmetry_1")

Scripting Interfaces


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