COMPOSITE DIELECTRIC MATERIAL, COMPOSITE DIELECTRIC SUBSTRATE, PREPREG, COATED METAL FOIL, MOLDED SHEET, COMPOSITE MAGNETIC SUBSTRATE, SUBSTRATE, DOUBLE SIDE METAL FOIL-CLAD SUBSTRATE, FLAME RETARDANT SUBSTRATE, POLYVINYLBENZYL ETHER RESIN COMPOSITION, THERMOSETTIN

A composite dielectric material comprising a resin resulting from a polyvinylbenzyl ether compound and a dielectric ceramic powder dispersed therein is useful in the high-frequency region. A composite magnetic material comprising a polyvinylbenzyl ether compound and a magnetic powder is also provided as well as a flame retardant material comprising a polyvinylbenzyl ether compound and a flame retardant. These materials may be used in the fabrication of substrates, prepreg sheets, coated metal foils, molded items, and metal foil-clad substrates.