A filled polymeric film comprising polymer and an inorganic dielectric constant-enhancing additive, the filled polymeric film having 12 to 75 percent by weight of said inorganic dielectric constant-enhancing additive, based on the total weight of the polymer and said inorganic constant-enhancing additive in the filled polymeric film; wherein the polymer comprises imidazole groups; and wherein the filled polymeric film has a filled film tenacity that is 70 to 100 percent of a neat film tenacity of a polymeric film having the same thickness made from the same polymer but without the said inorganic dielectric constant-enhancing additive.