Title:
NOISE FILTER ARRAY
Document Type and Number:
WIPO Patent Application WO/2008/013073
Kind Code:
A1
Abstract:
Provided is a noise filter array wherein characteristic variance among a plurality
of filter elements is eliminated while maintaining a simple configuration as
a whole. The filter elements (F1-F4) composed of an LC parallel resonance circuit
and the LC serial resonance circuit, which have coils and capacitors, are arranged
in parallel in an array and integrally formed. Grounding capacitors (C12-C42)
which configure the filter elements (F1-F4) are arranged by having their grounding
side electrode (9) commonly face each signal side electrode (8). The grounding
capacitors are connected to an inductance adjusting conductor (L0), which configures
the LC serial resonance circuit with the capacitor through a via hole (7). The
lengths from the connecting position of the via hole (7) of the inductance adjusting
conductor (L0) to grounding terminals (GND1, GND2) are made equivalent for each
of the filter elements (F1-F4).
Inventors:
HADANO KENJIRO (JP)
SASAKI TOMOHIRO (JP)
UENO HARUHIKO (JP)
SASAKI TOMOHIRO (JP)
UENO HARUHIKO (JP)
Application Number:
PCT/JP2007/063994
Publication Date:
January 31, 2008
Filing Date:
July 13, 2007
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
HADANO KENJIRO (JP)
SASAKI TOMOHIRO (JP)
UENO HARUHIKO (JP)
HADANO KENJIRO (JP)
SASAKI TOMOHIRO (JP)
UENO HARUHIKO (JP)
International Classes:
H03H7/01; H01F17/00; H01F27/00; H01G4/40
Foreign References:
| JP2004343696A | 2004-12-02 | |||
| JPH0710914U | 1995-02-14 | |||
| JP2005064267A | 2005-03-10 |
Other References:
See also references of EP 2048777A4
None
None
Attorney, Agent or Firm:
NISHIZAWA, Hitoshi (Daido Seimei Minami-kan 1-2-11 Edobori, Nishi-ku, Osaka-sh, Osaka 02, JP)
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