A method of manufacture of a dielectric material having a specific inductive capacity, the dielectric material having: a silicone rubber base material; a carbon material in a proportion of 2 to 70 wt. % based on the whole weight of the dielectric material, selected from among spherical carbon, flat carbon, carbon nanotube and carbon fiber of an aspect ratio of not more than 11, of which carbon material is optionally carbon nanotube in a proportion of 1 to 5 wt. % based on the whole weight of the dielectric material; and, additionally, a conductive carbon of a developed structure in a proportion of 1 to 20 wt. % based on the whole weight of the dielectric material, said conductive carbon of a developed structure defined in terms of a DBP oil absorption not less than 100 cm 3 /100g, the DBP oil absorption being measured according to ASTM D 2-414-79, wherein the carbon material and the conductive carbon of a developed structure are dispersed in the silicone rubber base material in a blend, and the proportion of the silicone rubber base material is in the range of 30 to 97 wt.% based on the whole weight of the dielectric material, characterised in that the value (εr') of the real number portion and the value (εr") of the imaginary number portion of the complex specific inductive capacity of said dielectric material are controlled through the blending quantities of said carbon and said conductive carbon in said silicone rubber base material, such that the value (εr') of the real number portion is in the range 3 to 1300 at 0.9 GHz and the value (εr") of the imaginary number portion is in the range 0.2 to 1300 at 0.9 GHz, and the value of the dielectric loss (tanδ)=εr"/εr' is in the range 0.1 to 2.5 at 0.9 GHz. a silicone rubber base material; a carbon material in a proportion of 2 to 70 wt. % based on the whole weight of the dielectric material, selected from among spherical carbon, flat carbon, carbon nanotube and carbon fiber of an aspect ratio of not more than 11, of which carbon material is optionally carbon nanotube in a proportion of 1 to 5 wt. % based on the whole weight of the dielectric material; and, additionally, a conductive carbon of a developed structure in a proportion of 1 to 20 wt. % based on the whole weight of the dielectric material, said conductive carbon of a developed structure defined in terms of a DBP oil absorption not less than 100 cm 3 /100g, the DBP oil absorption being measured according to ASTM D 2-414-79, wherein the carbon material and the conductive carbon of a developed structure are dispersed in the silicone rubber base material in a blend, and the proportion of the silicone rubber base material is in the range of 30 to 97 wt.% based on the whole weight of the dielectric material, characterised in that the value (εr') of the real number portion and the value (εr") of the imaginary number portion of the complex specific inductive capacity of said dielectric material are controlled through the blending quantities of said carbon and said conductive carbon in said silicone rubber base material, such that the value (εr') of the real number portion is in the range 3 to 1300 at 0.9 GHz and the value (εr") of the imaginary number portion is in the range 0.2 to 1300 at 0.9 GHz, and the value of the dielectric loss (tanδ)=εr"/εr' is in the range 0.1 to 2.5 at 0.9 GHz.