Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Reexamination Certificate
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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Ito Kiyoshi
Kobayashi Osamu
Shirai Mayuka
Suzuki Yukio
Yamada Osamu
Ham Seungsook
Minebea Co. Ltd.
Oliff & Berridg,e PLC
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