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HFSS and Planar EM Simulators > Frequency-Dependent Material PropertiesThe properties of some materials vary with the frequency of the field excitation. This frequency dependence is often linear within a certain frequency range and constant outside of the frequency range, as shown below, where epsrlower is the relative permittivity of a material below the frequency range 20 - 50 GHz. epsrupper is the relative permittivity of a material above the frequency range 20 - 50 GHz. flower is the lower frequency, below which the material property is constant. fupper is the upper frequency, above which the material property is constant. In general, to account for this variance within a given frequency range, use the Piecewise Linear Material Input window dialog box to specify a property’s values at frequencies below and above the frequency range. Based on these values, Ansoft Designer automatically creates 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.
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