XF's Debye-Drude material definition offers two dispersive models—Debye and Drude—whose complex permittivity varies with frequency. The models support multiple poles for more flexibility when fitting the XF material to a set of measured data. Because XF uses the finite-difference time-domain (FDTD) method, a single simulation includes this dispersion over a range of frequencies, for example 850 MHz to 6 GHz.

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