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Title:
NOISE FILTER
Document Type and Number:
WIPO Patent Application WO/2012/039119
Kind Code:
A1
Abstract:
There is provided a noise filter which can reliably reject an in-phase component included in a differential signal without generating antiresonance at a target frequency reject and, a transmission device including such a noise filter. Ends 11a and 12a of a pair of coils 11 and 12 are connected to a pair of transmission lines 7a and 7b in the vicinity of the transmitting circuit 4, and other ends 11b and 12b are short-circuited. The coils 11 and 12 are magnetically coupled so that the magnetic flux is cancelled regarding the in-phase component that transmits the pair of transmission lines 7a and 7b, and the magnetic flux is increased regarding an opposite-phase component that transmits the pair of transmission lines 7a and 7b. A series circuit 6, which includes an inductor 2 and a capacitor 3 connected in series, is connected to the pair of coils 11 and 12 and the GND. Each value of the pair of coils 11 and 12, the inductor 2, and the capacitor 3 is set so that a resonance frequency of the in-phase component is a target frequency.

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Inventors:
TAMAKI HIROTO (JP)
Application Number:
JP2011/005243
Publication Date:
March 29, 2012
Filing Date:
September 16, 2011
Export Citation:
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Assignee:
CANON KK (JP)
TAMAKI HIROTO (JP)
International Classes:
H04B3/00; H01F17/00; H03H1/00; H03H7/09; H04B3/02; H04B3/30; H04L12/40
Foreign References:
US20070252659A12007-11-01
US20090240994A12009-09-24
JP2010214396A2010-09-30
Other References:
G.MATTHAEI, L.YOUNG, E.M.T. JONES, MICROWAVE FILTERS, IMPEDANCE-MATCHING NETWORKS, AND COUPLING STRUCTURES, pages 725,772
Attorney, Agent or Firm:
ABE, Takuma et al. (C/O CANON KABUSHIKI KAISHA, 30-2 Shimomaruko 3-chome, Ohta-k, Tokyo 01, 14685, JP)
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Claims:



 
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