Title:
VARIABLE-FREQUENCY LC FILTER, HIGH-FREQUENCY FRONT END CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2017/043155
Kind Code:
A1
Abstract:
According to the present invention, a first series-arm LC filter circuit (41) is provided with: a capacitor (411) and an inductor (412) that are connected in series between a first connection terminal (P401) and a second connection terminal (P402); a capacitor (413) that is connected in parallel to said series circuit; and an inductor (414) and a variable capacitor (415) that are connected in parallel between a ground potential and a point of connection between capacitor (411) and inductor (412). A first parallel-arm LC filter circuit (42) is connected between a ground potential and the first connection terminal (P401). A second parallel-arm LC filter (43) is connected between a ground potential and the second connection terminal (P402). Inductor (412) is connected to the second connection terminal (P402) directly or via another inductor.
Inventors:
MORI HIROTSUGU (JP)
Application Number:
PCT/JP2016/069222
Publication Date:
March 16, 2017
Filing Date:
June 29, 2016
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H7/12; H03H7/075; H03H7/09; H03H9/64; H04B1/52; H04B1/58
Domestic Patent References:
| WO2014192754A1 | 2014-12-04 |
Foreign References:
| US20140285286A1 | 2014-09-25 | |||
| JPS61212106A | 1986-09-20 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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