Inductor element for noise suppression

Details Inductor element for noise suppression Inductor element for noise suppression

1996-09-11

2000-10-24

Kozma, Thomas J.

Inductor devices

Core forms casing

333185, 336175, 336192, 336233, H01F 2724, H01F 2730

Patent

active

061373893

ABSTRACT:
The present invention is directed to an inductor element for noise suppression capable of suppressing the high frequency component in the GHz band through absorption.
A core for passing through a signal line conductor is provided. The core is at least partially constituted with a compound member that is prepared by mixing ferromagnetic metal particles and resin. The compound member imparts a frequency-dependant absorption loss to a signal running through the signal line conductor. The absorption loss starts essentially in the GHz band and the high level of absorption remains in effect up to at least 20 GHz.

REFERENCES:
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patent: 4301428 (1981-11-01), Mayer
patent: 4776980 (1988-10-01), Ruffini
patent: 5359311 (1994-10-01), Kawabata et al.
"A Dissipative Coaxial RFI Filter," Paul Schiffres. IEEE Transactions on Electromagnetic Compatibility; Jan. 1964 p. 55-61.
"Compatible EMI Filters," H. M. Schlicke, et al. IEEE Spectrum; Oct. 1967 p. 59-68.
"Miniature Low-Pass EMI Filters," Jerry H. Bogar, et al. Proceedings of the IEEE, vol. 67, No. 1, Jan. 1979 p. 159-163.
"Transmission Properties of Metal-Semiconductor-Relaxor Microstrip Lines," Hector H. Fiallo, et al. IEEE Transactions on Microwave Theory and Techniques, vol. 42, No. 7, Jul. 1994 p. 1176-1182.
"Absorber Chip Provides RF EMI Filtering," F. Uchikoba, et al. Microwaves & RF; Feb. 1995 p. 69, 72.

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