| 摘要 |
PROBLEM TO BE SOLVED: To provide a dielectric material with a high dielectric constant and with high dimensional accuracy allowing easy manufacture, processing and handling, and to provide an antenna using the dielectric material for an RFID tag or reader/writer which operates in an UHF or SHF band. SOLUTION: Titanium oxide, strontium carbonate, etc. are mixed, granulated and roasted. The resulting material is crushed by using a hammer mill, a roller mill or the like, and then ground by using a ball mill, a vibrating mill, an attritor or the like, or ground by using an organic solvent to obtain a ferromagnetic ceramic powder having a predetermined particle diameter. The ferromagnetic ceramic powder is then mixed with a plastic, e.g., a thermoplastic resin such as nylon, polyethylene, polypropylene, polycarbonate, vinyl chloride resin, methacrylic resin, polystylene, ABS resin, acetal resin and fluororesin, or a thermosetting resin such as phenolic resin, urea resin and alkyd resin, or rubber at a predetermined ratio, and the resulting material is molded by a method such as extrusion, rolling, injection molding, and compression molding. COPYRIGHT: (C)2005,JPO&NCIPI
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