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Patent Searching and Data


Title:
NOISE FILTER
Document Type and Number:
Japanese Patent JP2004140788
Kind Code:
A
Abstract:

To provide a small noise filter capable of preventing the resonance of noise and setting a rate of the attenuation of a signal for each mode.

A laminate 2 is formed by laminating four magnetic material layers 2a to 2d. Signal lines 3 and 4 are arranged side by side between the magnetic material layers 2b and 2c. A transmission line 6 is constituted by sandwiching the magnetic material layers 2b and 2c by two ground electrodes 5. A dielectric member 7 is arranged between the signal lines 3 and 4. Consequently, a signal of a common mode can attenuate by using the magnetic loss due to the magnetic material layers 2a to 2d. A signal of a normal mode can propagate while preventing waveform distortion by lowering effective and magnetic permeability by the dielectric member 7.


Inventors:
HARADA TORU
Application Number:
JP2003000201298
Publication Date:
May 13, 2004
Filing Date:
July 24, 2003
Export Citation:
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Assignee:
MURATA MANUFACTURING CO
International Classes:
H03H7/06; H01P1/203; H03H1/00; H03H7/075; H03H7/09; (IPC1-7): H03H7/06; H03H7/075
Attorney, Agent or Firm:
Kazuhiko Hirose