| 摘要 |
A ferrite core for line filters according to the invention comprises, as main components, manganese oxide in an amount of 13.5 to 16% by weight, calculated as MnO and zinc oxide in an amount of 14 to 16% by weight calculated as ZnO with the rest being iron oxide, and as subordinate components, silicon oxide in an amount of 50 to 200 ppm calculated as SiO2, calcium oxide in an amount of 100 to 350 ppm calculated as CaO, niobium oxide in an amount of 30 to 150 ppm calculated as Nb2O5, molybdenum oxide in an amount of 20 to 300 ppm calculated as MoO3, and bismuth oxide in an amount of 100 to 800 ppm calculated as Bi2O3. Such a core has high inductance at about 1 kHz and high impedance at about 500 kHz, and shows a high noise reduction coefficient over a wide frequency band.
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