Dielectric Characteristics of UV ‐Curable CaCu 3 Ti 4 O 12 Composite Thick Film Capacitors on Cu Foils

Dielectric composite thick films containing a high dielectric constant CaCu 3 Ti 4 O 12 ( CCTO ) filler in a UV ‐cured polymer matrix were investigated as flexible planar capacitors on Cu foils. Dielectric performance depended on the volume fraction and size of CCTO particles dispersed in the cured polymer matrix. As a result, the thick films containing 33.3 vol.% CCTO with an average particle size of 0.47 μm exhibited a dielectric constant of ~80 and a dielectric loss of ~0.06 at 10  kH z. The effective medium theory model incorporating a morphology fitting parameter has been proven to be most close to the experimental values.