HFSS15: Assigning Frequency Dependent Material: Multipole Debye Model Input

Having selected Multipole Debye as the model for the frequency dependent material property, you enter the required values in the dialog displayed.

1. You can enter data either into the columns for Frequency (GHz), Relative Permittivity and Dielectric Loss Tangent The frequency can be ranged from 0 to unlimited. The relative permittivity is ranged from 1.0 to unlimited and loss tangent is ranged from 0 to unlimited. To get the good results, you should provide more than 5 frequency points.,

You can also import the data from a tab format text file.

The import data will be shown in the data table, and then can be modified. You can export current input data to a file. The file is a tab file with extension .tab (same as dataset import/export file). Below is an example of the file format. Each row provides Frequency (assumed to be Hz), Permittivity, and Loss Tangent.

0.00001 3.8136 0.00128

0.00010 3.7914 0.00520

0.00100 3.7500 0.00700

0.01000 3.7119 0.00700

0.10000 3.6742 0.00700

1.00000 3.6354 0.00700

2.15444 3.6346 0.00702

3.17000 3.6325 0.01073

4.64160 3.6186 0.01500

10.0000 3.5777 0.01750

21.5444 3.5458 0.01750

26.0000 3.5383 0.01750

46.4160 3.5148 0.01750

50.0000 3.5119 0.01750

During the data input, the frequency dependent expressions for permittivity or loss tangent are calculated using Multipole Debye model, and are plotted for reference. The input data are also linearly interpolated and drawn on the plot for comparison..

If desired, you can change or rescale the plot by selecting the Frequency label and right-clicking to display the Edit Properties menu.

Select the Scaling tab, find the Units row, and right click to select the desired scaling.

2. Based on this data the software dynamically generates frequency dependent expressions for relative permittivity and loss tangent through the Multipole Debye Model. The input dialog plots these expressions together with your input data through the linear interpolations.

• The generated expressions provide the new value for the material properties of relative permittivity and loss tangent.

• Both the expressions and data triples can be exported and re-imported.

After you have entered the data for your selection, you return to the View/Edit Material window. New default function names appear in the material property text boxes. HFSS automatically created a dataset 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.