Volume 5, Issue 10 (November 2008) The Contemporary Definition
of Complex Relative Permittivity ASTM D150 [Standard Test
Methods for AC Loss Characteristic and Permittivity (Dielectric
Constant) of Solid Electrical Insulation, 2004] is the standard
for measurement of alternating current (AC). Aimed at an
analysis of this standard and proceeding from the information
transmission characteristic of the dielectric, the definition of
ac complex relative permittivity
εr′(=Iac′/I0=Qac′/Q0=Cac′/C0=ε′/ε0) is put forward anew.
Faraday’s “relative permittivity” is a result of this definition
under the specific condition (ω=0).