Assigning Frequency Dependent Material: Debye Model Input
When you select Debye Model Input as the model for the frequency dependent material property, the Debye Model Input window appears.
From this window, you can enter material property values and view a property vs. frequency plot.
Use the fields to enter lower and upper frequency values for:
- Frequency Range – HFSS assumes that the material's property values remain constant between these frequencies.
- Relative Permittivity – If the permittivity of the material does not vary with frequency, enter the same value you entered for the Frequency Range Lower Frequency. If you need to specify a value for At High/Optical Frequency, select the check box and enter a value.
- Conductivity or Dielectric Loss Tangent – Select either At DC to specify conductivity, or At Lower Frequency to specify Loss Tangent.
After you have entered the data for your selection, click OK to return to the View/Edit Material window. New default function names appear in the material property text boxes. A dataset is automatically created for each material property. Based on a varying property’s dataset, HFSS can interpolate the property’s values at the desired frequencies during solution generation.
To modify the dataset with additional points, see Editing Datasets.
Neither the piecewise or the loss models ask for frequency dependent conductivity because there the constant sigma represents the DC loss and the frequency dependent loss tangent represents the polarization losses.