Title:
FILTER DEVICE, MULTIPLEXER, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2018/159205
Kind Code:
A1
Abstract:
According to the present invention, a filter (10) has a first pass band and a second pass band at a higher frequency side than the first pass band, and is provided with a series arm circuit (11) and a parallel arm circuit (12). The parallel arm circuit (12) is provided with: a parallel arm resonator (p1) which is connected between a node (x1) and the ground and has a resonance frequency frp between the first pass band and the second pass band; an inductor (L1) connected between the node (x1) and the ground; and an inductor (L2) connected between the node (x1) and the ground and connected in series with the parallel arm resonator (p1), wherein a circuit, in which the parallel arm resonator (p1) and the inductor (L2) are connected in series, and the inductor (L1) are connected in parallel.
Inventors:
SUGAHARA TADASHI (JP)
MORI HIROTSUGU (JP)
NOSAKA KOJI (JP)
MORI HIROTSUGU (JP)
NOSAKA KOJI (JP)
Application Number:
PCT/JP2018/003305
Publication Date:
September 07, 2018
Filing Date:
January 31, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H7/09; H04B1/00
Domestic Patent References:
| WO2014064987A1 | 2014-05-01 |
Foreign References:
| JPH07231241A | 1995-08-29 | |||
| JP2000323961A | 2000-11-24 | |||
| JP2003298391A | 2003-10-17 | |||
| JP2008301223A | 2008-12-11 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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