Title:
HIGH FREQUENCY FILTER, MULTIPLEXER, HIGH FREQUENCY FRONT-END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/021983
Kind Code:
A1
Abstract:
A high frequency filter (10) having a first band as a passband is provided with a first circuit connected to a node (X1) and a node (X2), and a second circuit connected to the node (X1) and the node (X2). The first circuit includes a filter (11) which has, as a passband, a second band which is a band including some of the frequencies of the first band and having a bandwidth narrower than that of the first band. The second circuit includes: a filter (12) which is a band including some of the frequencies of the first band and having a bandwidth narrower than that of the first band, and which has, as a passband, a third band positioned on the higher frequency side of a central frequency of the second band; a phase shifter (21) connected to one terminal of the filter (12); and a phase shifter (22) connected to another terminal of the filter (12).
Inventors:
NOSAKA KOJI (JP)
Application Number:
PCT/JP2018/027433
Publication Date:
January 31, 2019
Filing Date:
July 23, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H7/18; H03H7/46; H03H9/54; H03H9/70; H03H9/72
Foreign References:
| JP2004166258A | 2004-06-10 | |||
| JPH08321738A | 1996-12-03 | |||
| JP2014039199A | 2014-02-27 | |||
| JP2014502803A | 2014-02-03 | |||
| JP2005184143A | 2005-07-07 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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