Ferrite core for line filters

Details Ferrite core for line filters Ferrite core for line filters

1997-03-21

1998-07-14

Bonner, Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6259, 252 6263, H01F 134

Patent

active

057799300

ABSTRACT:
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 SiO.sub.2, 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 Nb.sub.2 O.sub.5, molybdenum oxide in an amount of 20 to 300 ppm calculated as MoO.sub.3, and bismuth oxide in an amount of 100 to 800 ppm calculated as Bi.sub.2 O.sub.3. 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.

REFERENCES:
patent: 5498361 (1996-03-01), Matsukawa et al.
H. Inaba, et al., "Magnetic Properties and the Grain Boundary Structure of Mn-Zn Ferrites with the Additional of Nb2O5," Journal of Magnetism and Magnetic Materials, vol. 133, No. 1/03, 1 May 1994, pp. 487-489.

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