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Patent Searching and Data


Title:
DENOISING FILTER
Document Type and Number:
WIPO Patent Application WO/2012/049890
Kind Code:
A1
Abstract:
A first choke coil (CH1-1) formed by winding an electric wire around a Mn-Zn based toroidal core which has a superior attenuation property at a low frequency and a second choke coil (CH1-2) formed by winding an electric wire around a Ni-Zn based toroidal core which has a superior attenuation property at a high frequency, are series-connected between a first input terminal (IN1) and a first output terminal (OUT1). A third choke coil (CH1-3) similar to the first toroidal coil (CH1-1) and a fourth choke coil (CH1-4) similar to the second toroidal coil (CH1-2) are series-connected between a second input terminal (IN2) and a second output terminal (OUT2). Thereby, a stable and large attenuation amount can be obtained in a wideband frequency range from a low frequency to a high frequency, and thus, high frequency noise can be effectively eliminated.

Inventors:
ARAI TOSHIO (JP)
ITO TSUYOSHI (JP)
Application Number:
JP2011/064744
Publication Date:
April 19, 2012
Filing Date:
June 28, 2011
Export Citation:
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Assignee:
NIPPON ANTENNA KK (?1160011, JP)
ARAI TOSHIO (JP)
ITO TSUYOSHI (JP)
International Classes:
H03H7/09; H01F17/06; H01F27/00
Foreign References:
JPS60229514A1985-11-14
JPS61187409A1986-08-21
JPH0577921U1993-10-22
Attorney, Agent or Firm:
ASAMI Yasuo et al. (Yukon Tokkyo Jimusho, Nord BLDG. 602 6-11, Kita-Ueno 1-chome, Taito-k, Tokyo 14, 〒1100014, JP)
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Claims: