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Ansoft Designer / Ansys Designer 在线帮助文档：

HFSS and Planar EM Simulators >
Working with Materials >
   Adding New Materials >
       Defining Frequency-Dependent Material Properties           

Defining Frequency-Dependent Material Properties

1. With respect to a material selected in the Select Definition window, in the View/Edit Material window, click Set Frequency Dependency.

2. In the Frequency Dependent Material Setup Option window, do one of the following:

• Select Piecewise Linear Input to define a property value as a piecewise linear function. You will specify the property’s values at frequencies below and above a frequency range. Based on these values, Ansoft Designer will automatically create a linear dataset that specifies the property’s values at the desired frequencies during solution generation. This dataset can be modified with additional points if desired.

• Select Loss Model Input if you are working with a lossy dielectric material with a lower frequency near DC. Ansoft Designer will enable you to specify the material’s conductivity at DC, rather than its loss tangent, and specify the high frequency/optical permittivity.

• Select Enter Frequency Dependent Data Points if you want to add frequency dependent data points or edit existing frequency dependent data points.

3. Click OK.

• If you selected Piecewise Linear Input, the Piecewise Linear Frequency Dependent Material Input dialog box appears.

• If you selected Loss Model Input, the Loss Model Frequency Dependent Material Input dialog box appears. In this case, follow the directions for specifying frequency dependence for a lossy dielectric material.

• If you selected Enter Frequency Dependent Data Points, that dialog box appears. In this case, follow the directions for entering frequency dependent data points.

4. In the Piecewise Linear Frequency Dependent Material Input dialog box, enter a Lower Frequency value.

Ansoft Designer assumes that the material’s property values remain constant below this frequency.

5. Enter an Upper Frequency value.

Ansoft Designer assumes that the material’s property values remain constant above this frequency.

6. Enter the permittivity of the material at frequencies below the lower frequency in the At Lower Frequency text box.

7. Enter the permittivity of the material at frequencies above the upper frequency in the At Upper Frequency text box.

If the permittivity of the material does not vary with frequency, enter the same value you entered for the permittivity’s lower frequency.

8. Follow steps 5 and 6 for entering values for permeability, dielectric loss tangent, and magnetic loss tangent.

9. Click OK.

You return to the View/Edit Material window. New default function names appear in the material property text boxes. Ansoft Designer automatically created a dataset for each material property. Based on a varying property’s dataset, Ansoft Designer can interpolate the property’s values at the desired frequencies during solution generation.

To modify the dataset with additional points, see Adding Datasets.

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