Title:
FILTER AND MULTIPLEXER
Document Type and Number:
WIPO Patent Application WO/2022/107681
Kind Code:
A1
Abstract:
This filter (1) comprises a first filter circuit (10) and an additional circuit (20). The first filter circuit (10) has a resonator electrode and a main wiring (110). The main wiring (110) includes a first metal film (111) and a second metal film (112) provided on the first metal film (111) in contact with the first metal film (111). The additional circuit (20) includes an IDT electrode group (25) having a plurality of IDT electrodes (31, 32) and a sub-wiring (120) connecting the IDT electrode group (25) and the first filter circuit (10). At least a portion of the sub-wiring (120) includes a third metal film (123) connected to the IDT electrode group (25). The third metal film (123) is covered with a fourth metal film (140) via an insulating layer (130) provided on the third metal film (123). The fourth metal film (140) is connected to a ground terminal provided on a substrate (100).
Inventors:
TAKATA TOSHIAKI (JP)
Application Number:
PCT/JP2021/041591
Publication Date:
May 27, 2022
Filing Date:
November 11, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/64; H03H9/72
Domestic Patent References:
| WO2020138290A1 | 2020-07-02 | |||
| WO2012063521A1 | 2012-05-18 |
Foreign References:
| JP2019121879A | 2019-07-22 | |||
| JPS6090416A | 1985-05-21 | |||
| JP2017092945A | 2017-05-25 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
Download PDF: