Title:
METHOD FOR OPTIMISING OUT-OF-BAND SUPPRESSION OF FILTER, AND FILTER, MULTIPLEXER, AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/042463
Kind Code:
A1
Abstract:
The present invention relates to the technical field of filters, and relates in particular to a method for optimising the out-of-band suppression of a filter, and a filter, a multiplexer, and a communication device. In the present method, the effective electromechanical coupling coefficients of a series resonator and a parallel resonator can be flexibly adjusted, not only keeping filter passband coverage unchanged, but also solving the problem of the poor harmonic suppression of low-frequency bulk acoustic wave filters, and also ensuring the suppression balance of harmonic suppression areas.
Inventors:
XU LIJUN (CN)
PANG WEI (CN)
PANG WEI (CN)
Application Number:
PCT/CN2021/114004
Publication Date:
March 03, 2022
Filing Date:
August 23, 2021
Export Citation:
Assignee:
ROFS MICROSYSTEM TIANJIN CO LTD (CN)
International Classes:
H03H9/50; H03H9/02; H03H9/52; H03H9/54; H03H9/60; H03H9/70
Foreign References:
| CN112073028A | 2020-12-11 | |||
| CN111327296A | 2020-06-23 | |||
| CN111313862A | 2020-06-19 | |||
| CN111010143A | 2020-04-14 | |||
| JP2018093388A | 2018-06-14 |
Attorney, Agent or Firm:
CHINA SMART INTELLECTUAL PROPERTY LTD. (CN)
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