Title:
FILTER DEVICE, HIGH-FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/037967
Kind Code:
A1
Abstract:
The present invention is provided with: a filter (22A) which is connected to a common terminal (110), and which has a first property; a variable filter (22B) which is connected to the common terminal (110), and which is capable of varying between a second property and a third property; and a switch (23). A second passband, which includes an overlapping band of which the frequencies partially overlap the attenuation band of the filter (22A), is defined by the second property. The insertion loss in an overlapping band of the third property is greater than the insertion loss in the overlapping band of the second property. If the filter (22A) is selected by the switch (23), the variable filter (22B) is set so as to have the third property.
Inventors:
NOSAKA KOJI (JP)
Application Number:
PCT/JP2017/029310
Publication Date:
March 01, 2018
Filing Date:
August 14, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/72; H03H7/46; H04B1/00
Domestic Patent References:
| WO2015098791A1 | 2015-07-02 | |||
| WO2017138540A1 | 2017-08-17 |
Foreign References:
| JP2006254281A | 2006-09-21 | |||
| JP2004140696A | 2004-05-13 | |||
| JP2000323961A | 2000-11-24 | |||
| JP2013118611A | 2013-06-13 | |||
| JP2009207116A | 2009-09-10 | |||
| JP2009130831A | 2009-06-11 | |||
| JP2014502803A | 2014-02-03 | |||
| JP2016054374A | 2016-04-14 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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