Noise filter

Details Noise filter Noise filter

2005-02-08

2005-02-08

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S012000, C333S116000, C333S184000

Reexamination Certificate

active

06853268

ABSTRACT:
A noise filter includes four magnetic layers including upper and lower magnetic layers and intermediate magnetic layers which are laminated to define a laminated unit. Two signal lines are disposed side by side between the intermediate magnetic layers, and two ground electrodes sandwich the intermediate magnetic layers therebetween so as to form a transmission line. A dielectric member is disposed between the two signal lines. With this configuration, a common-mode signal is attenuated by utilizing magnetic loss in the magnetic layers. In contrast, by providing the dielectric member, a normal-mode signal is allowed to propagate by reducing the effective relative magnetic permeability while preventing the occurrence of blunt waves.

REFERENCES:
patent: 3663902 (1972-05-01), Deutscher et al.
patent: 5625169 (1997-04-01), Tanaka
patent: 6148221 (2000-11-01), Ishikawa et al.
patent: 6806794 (2004-10-01), Yamamoto et al.

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