Title:
ELASTIC WAVE FILTER DEVICE, HIGH FREQUENCY FRONT END CIRCUIT, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/061783
Kind Code:
A1
Abstract:
A filter (10) is provided with: a longitudinal coupling resonator (s30); a parallel arm resonator (p1) that is connected between a node (x1) on a route that connects input-output terminals (111, 112) and a ground; and a frequency variable circuit (11) connected to the parallel arm resonator (p1). The longitudinal coupling resonator (s30) is provided with: a plurality of IDT electrodes (311-313) comprising an odd number of IDT electrodes; i.e., at least three; an odd number IDT terminal; and an even number IDT terminal. The even number IDT terminal is a first signal terminal connected to one or more IDT electrodes (312) that are placed at an even number from the end among the plurality of IDT electrodes (311-313). The odd number IDT terminal is a second signal terminal connected to two or more IDT electrodes (311, 313) that are placed at an odd number from the end. The longitudinal coupling resonator (s30) is provided so that the even number IDT terminal is connected with the node (x1).
Inventors:
NOSAKA KOJI (JP)
Application Number:
PCT/JP2017/033142
Publication Date:
April 05, 2018
Filing Date:
September 13, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64
Domestic Patent References:
| WO2013061694A1 | 2013-05-02 |
Foreign References:
| US20090251235A1 | 2009-10-08 | |||
| JP2002314372A | 2002-10-25 | |||
| JP2008028539A | 2008-02-07 | |||
| JP2009207116A | 2009-09-10 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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