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Title:
LAMINATED LC FILTER
Document Type and Number:
WIPO Patent Application WO/2017/199749
Kind Code:
A1
Abstract:
Provided is a laminated LC filter in which an attenuation pole is formed near a pass band and in which impedance matching between input and output is performed. In the laminated LC filter, an LC parallel resonator LC1 has an LC parallel resonator inductor and an LC parallel resonator capacitor C4 connected in parallel. The LC parallel resonator inductor is divided into divided LC parallel resonator inductors L2, L3. An LC series resonator LC3 is connected between the ground and a point at which the divided LC parallel resonator inductors L2, L3 are connected to each other. The LC series resonator LC3 has an LC series resonator inductor L4 and an LC series resonator capacitor C5 connected in series. At one point between layers of a laminated body 1, the divided LC parallel resonator inductor L3 branches from the LC series resonator inductor L4. When the divided LC parallel resonator inductor L3 and the LC series resonator inductor L4 are viewed, a winding shaft of one of the inductors is disposed inside a spiral pattern formed of an inductor electrode of the other inductor.

Inventors:
SHIOKAWA NOBORU (JP)
Application Number:
PCT/JP2017/017130
Publication Date:
November 23, 2017
Filing Date:
May 01, 2017
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H7/075; H01F17/00; H03H7/09
Domestic Patent References:
WO2012121038A12012-09-13
Foreign References:
JP2006203862A2006-08-03
JPH10200357A1998-07-31
JP2008529360A2008-07-31
JP2013070288A2013-04-18
JP2012090171A2012-05-10
JPS57202110A1982-12-10
Attorney, Agent or Firm:
KAWAMOTO, Takashi (JP)
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