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5.2.2. Materials and Attributes

Both lossless and lossy materials are supported in RF3p. Material bulk properties are defined according to the relative permittivity, relative permeability, electric loss tangent, magnetic loss tangent, electric bulk conductivity, magnetic bulk conductivity, and electric resistivity. Any of these may be isotropic or symmetric tensor materials. In addition, any material component may be either frequency-independent (defined with constants or predefined variables) or frequency-dependent (defined with an equation in frequency, as described here). When defining new materials or modifying the properties of existing materials, you may specify either the electric conductivity or the electric loss tangent, but not both, because including both would introduce an ambiguity in your material definition. The same rule applies for magnetic materials: you may specify either the magnetic conductivity or the magnetic loss tangent, but not both. Any other combination of material properties is permitted. See Materials Management for information about setting up material parameters. For technical details on material attributes, see “Materials Details”.

In RF3p geometries, the default external boundary condition is PEC. In general, it is good practice to assign a boundary condition to every external surface in the system. Any external surface that does not have an explicit boundary condition assigned to it will be assumed to be PEC, regardless of what materials are adjacent to that external surface. Available boundary conditions in RF3p are impedance, symmetry, and open.

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