Title:
FILTER AND MULTIPLEXER
Document Type and Number:
WIPO Patent Application WO/2022/244671
Kind Code:
A1
Abstract:
A filter (1) comprises: a substrate (100) including a piezoelectric body layer and having a first signal electrode (T10) and a second signal electrode (T20); a filter circuit section (10) provided on a first path (r1) connecting the first signal electrode (T10) and the second signal electrode (T20); and an additional circuit section (20) provided on a second path (r2) connected in parallel to at least a part of the first path (r1). The filter circuit section (10) includes, provided on the substrate (100), a main wire (110) and one or more resonating elements. The additional circuit section (20) includes, provided on the substrate (100), a sub-wire (120) and an acoustically coupled resonator (25) having a plurality of elastic wave resonating elements arranged in parallel. An insulating film (130) is provided between the substrate (100) and the sub-wire (120). The permittivity of the insulating film (130) is smaller than the permittivity of the piezoelectric body layer.
Inventors:
TAKATA TOSHIAKI (JP)
Application Number:
PCT/JP2022/020047
Publication Date:
November 24, 2022
Filing Date:
May 12, 2022
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/64; H03H9/72
Domestic Patent References:
| WO2018143044A1 | 2018-08-09 |
Foreign References:
| JP2014171210A | 2014-09-18 | |||
| JP2017092945A | 2017-05-25 | |||
| JP2019121873A | 2019-07-22 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
Download PDF: