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HFSS and Planar EM Simulators >
Planar EM Technical Notes >
Frequency-Dependent Material Properties

Frequency-Dependent Material Properties

The 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

• epsr_lower is the relative permittivity of a material below the frequency range 20 - 50 GHz.

• epsr_upper is the relative permittivity of a material above the frequency range 20 - 50 GHz.

• f_lower is the lower frequency, below which the material property is constant.

• f_upper 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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