[SI-LIST] lossy dielectrics and causality

Dear SI experts,
    I am trying to generate a frequency domain response of
a lossy dielectric line. When I perform an inverse FFT I 
get a non-causal response. I have found for skin effect 
using Rskin*(1+j) in the numerator solves causality for
skin-effect. The dielectric loss in the denominator is
not as easy. Anyone know the answer?
Thanks in advance,
Alan
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