Abstract
Electric permittivity and magnetic permeability of linear passive dispersive medium were deflned using the circuit equation of an electrically small antenna (scatterer) with resonant and antiresonant properties. It was shown that the average macroscopic energy stored by the scatterers is proportional to frequency derivative of the input admittance of corresponding antenna. It was found that the average macroscopic energy density of electric and magnetic flelds in dispersive lossy medium is a function of frequency derivatives of its efiective constitutive parameters in accordance with Poynting's theorem in dispersive lossy medium clarifled for this case in the paper.
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