Patent ID: 7297296

Claim:
A method for manufacturing a composite dielectric comprising a porous body of an inorganic oxide and conductive particles dispersed in the porous body, wherein 1) the relative dielectric constant ∈r of said dielectric in high frequency bands of 1 GHz or more is 4 or more, and 2) the dielectric loss tanδ of said dielectric in high frequency bands of 1 GHz or more is 2×10 −4 or less. the method comprising a step of drying a material containing conductive particles and a wet gel of an inorganic oxide, wherein the material is obtained by mixing the conductive particles with a starting solution for the wet gel and then gelling the starting solution, and wherein all or part of the surface of the conductive particles is coated with a wet gel of an inorganic oxide before the conductive particles are mixed with the starting solution.