“…In order to improve understanding of the dielectric behaviour of DEs, several mixing rules [1,[38][39][40][41] have been proposed for simulating the dielectric constant (ε′) of polymer composites which comprise the isotropic dielectric matrix (dielectric constant ε 1 ′, volume fraction υ 1 ), filled with dielectric spheroids (dielectric constant ε 2 ′, volume fraction υ 2 = 1 -υ 1 ). The following equations are used to express the relations between the dielectric constant of DEs and the volume fraction of spherical fillers in DEs:…”