Title:
ACOUSTIC WAVE FILTER, MULTIPLEXER, HIGH FREQUENCY FRONT END CIRCUIT AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/078157
Kind Code:
A1
Abstract:
This acoustic wave filter (10A) is provided with: a series arm resonator (s1) which is provided on a path that connects input/output terminals; and a parallel arm circuit (11p) which is connected to a node on the above-described path and the ground. The parallel arm circuit (11p) comprises parallel arm resonators (p1) which are connected in parallel with each other and a capacitor (Cp1); the capacitor (Cp1) has a comb electrode which is composed of a plurality of electrode fingers; the frequency at which the impedance of the capacitor (Cp1) is maximum is set outside the passband of the acoustic wave filter (10A); and the comb electrode has at least two different electrode finger pitches or at least two different electrode finger duty ratios.
Inventors:
NOSAKA KOJI (JP)
Application Number:
PCT/JP2018/038319
Publication Date:
April 25, 2019
Filing Date:
October 15, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/64; H03H9/72
Domestic Patent References:
| WO2016104598A1 | 2016-06-30 | |||
| WO2017138540A1 | 2017-08-17 |
Foreign References:
| US20090251235A1 | 2009-10-08 | |||
| JP2001069031A | 2001-03-16 | |||
| JP2017135568A | 2017-08-03 | |||
| US20110299432A1 | 2011-12-08 | |||
| JP2008271511A | 2008-11-06 | |||
| JP2010062816A | 2010-03-18 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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