Title:
MULTIPLEXER
Document Type and Number:
WIPO Patent Application WO/2022/071185
Kind Code:
A1
Abstract:
A multiplexer (1) comprises: a first filter (10); and a second filter (50) having a passband on the lower-frequency side of the passband of the first filter (10). A longitudinal-coupling acoustic wave resonator (13) of the first filter (10) has an IDT electrode group (30) comprising a plurality of IDT electrodes (31-37). The IDT electrode group (30) has a non-symmetrical shape that passes through the center (C1) of the IDT electrode group (30) and uses a center line (CL) orthogonal to the acoustic wave propagation direction (D1) as a reference. Viewed from the longitudinal-coupling acoustic wave resonator (13), the IDT electrodes (32, 34, 36) connected to a first route (r1) on a common terminal (Tc) side have a smaller total average electrode finger pitch (pt) of the IDT electrodes, and a smaller total number of electrode finger pairs (pn) of the IDT electrodes, than the IDT electrodes (31, 33, 35, 37) connected to the first route (r1) on a first terminal (T1) side.
Inventors:
TAKATA TOSHIAKI (JP)
Application Number:
PCT/JP2021/035266
Publication Date:
April 07, 2022
Filing Date:
September 27, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/72
Domestic Patent References:
| WO2020044979A1 | 2020-03-05 | |||
| WO2012056767A1 | 2012-05-03 |
Foreign References:
| JP2017204743A | 2017-11-16 | |||
| JP2015119258A | 2015-06-25 | |||
| JP2019036856A | 2019-03-07 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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