Ferrite substrate for thin-film inductors, thin-film common mode filter using the substrate, thin-film common mode filter array using the substrate and manufacturing method of the substrate

A ferrite substrate for thin-film inductors is provided by means of blending raw materials to meet a composition of di-iron trioxide (Fe 2 O 3 ): 40 to 55 mol %, nickel oxide (NiO): 5 to 35 mol %, zinc oxide (ZnO): 10 to 40 mol %, and bismuth trioxide (Bi 2 O 3 ): 150 to 750 ppm, or of Fe 2 O 3 : 40...

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Bibliographic Details
Main Authors Sato, Akira, Shoji, Shigeru, Kawaguchi, Yukio, Tanaka, Kazumitsu, Tanishima, Toshikazu
Format Patent
LanguageEnglish
Published 09.12.2004
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Summary:A ferrite substrate for thin-film inductors is provided by means of blending raw materials to meet a composition of di-iron trioxide (Fe 2 O 3 ): 40 to 55 mol %, nickel oxide (NiO): 5 to 35 mol %, zinc oxide (ZnO): 10 to 40 mol %, and bismuth trioxide (Bi 2 O 3 ): 150 to 750 ppm, or of Fe 2 O 3 : 40 to 55 mol %, NiO: 5 to 35 mol %, ZnO: 10 to 40 mol %, cupric oxide (CuO): 5 to 10 mol %, and manganese dioxide (MnO 2 ): 0.5 to 2 mol %, and then molding and sintering the blended material, and applying hot isostatic pressing to the sintered article. A thin-film common mode filter and a thin-film common mode filter array using the ferrite substrate and the manufacturing method of the substrate are also provided.