Bead type noise filter

Details Bead type noise filter Bead type noise filter

2006-12-12

2006-12-12

Ham, Seungsook (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C252S062620, C336S233000

Reexamination Certificate

active

07148767

ABSTRACT:
A bead type noise filter according to the present invention is constituted by a magnetic core1formed of Mn—Zn ferrite having its resistivity increased so as to improve a high frequency characteristic, and having its permittivity lowered, and thereby can successfully suppress radiation noises without distorting the waveform of transmission signals. The magnetic core1constituting the bead type noise filter is formed of a high resistivity soft magnetic material, is shaped cylindrical, and has at least one through-hole1aso as to form a closed magnetic path, and the bead type noise filter is attached on a signal line2such that the signal line2is inserted through the through-hole1a. The soft magnetic material has a real part of complex relative permittivity ranging from 1,000 up to 20,000 at 1 kHz and 50 or lower at 1 MHz, and has a resistivity of 150 Ωm or higher.

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