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Title:
COMPOSITE FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/180420
Kind Code:
A1
Abstract:
Provided is a composite filter device with which an insert loss in the passband of a plurality of commonly connected bandpass filters can be effectively reduced. The composite filter device 1 is configured such that: one ends of a plurality of bandpass filters 4 to 7 are commonly connected; at least one bandpass filter 4 of the plurality of bandpass filters 4 to 7 includes a first filter 11, a switch 13, a second filter 12, and an impedance element 14 which is connected to the switch 13 and has an impedance higher than an input impedance value of the second filter 12; and the switch 13 is switched between a first state in which the first filter 11 and the second filter 12 are connected, and a second state in which the first filter 11 and the impedance element 14 are connected.

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Inventors:
YASUDA JUNPEI (JP)
TAKEUCHI MORIO (JP)
Application Number:
PCT/JP2018/009476
Publication Date:
October 04, 2018
Filing Date:
March 12, 2018
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H7/01; H03H7/38; H03H7/46; H03H9/64; H03H9/72
Domestic Patent References:
WO2005088833A12005-09-22
Foreign References:
JP2014140115A2014-07-31
JP2015023557A2015-02-02
JP2003273687A2003-09-26
JP2009523340A2009-06-18
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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