Title:
RADIO FREQUENCY FILTER AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/000228
Kind Code:
A1
Abstract:
The present application relates to the technical field of communications and provides a radio frequency filter and an electronic device, for improving the frequency of a radio frequency filter. The radio frequency filter has an input terminal and an output terminal, and comprises a first bulk acoustic wave resonator connected in series between the input terminal and a first node, and a second bulk acoustic wave resonator connected in parallel between the first node and a ground terminal, and the first node is coupled to the output terminal, wherein the first bulk acoustic wave resonator comprises a substrate, a bottom electrode, a first piezoelectric structure layer and a top electrode which are sequentially stacked, the first piezoelectric structure layer comprises at least two piezoelectric layers which are stacked, and an intermediate electrode is disposed between any two adjacent piezoelectric layers in the at least two piezoelectric layers; the second bulk acoustic wave resonator comprises a substrate, a bottom electrode, a second piezoelectric structure layer and a top electrode which are sequentially stacked, and the second piezoelectric structure layer comprises at least one piezoelectric layer. The number of the piezoelectric layers comprised in the first piezoelectric structure layer is different from the number of piezoelectric layers comprised in the second piezoelectric structure layer.
Inventors:
HOU HANGTIAN (CN)
LUO TIANCHENG (CN)
SUN CHENGLIANG (CN)
GAO ZONGZHI (CN)
LUO TIANCHENG (CN)
SUN CHENGLIANG (CN)
GAO ZONGZHI (CN)
Application Number:
PCT/CN2021/107703
Publication Date:
January 26, 2023
Filing Date:
July 21, 2021
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H03H9/54
Foreign References:
| CN107769749A | 2018-03-06 | |||
| CN207869081U | 2018-09-14 | |||
| US20120001704A1 | 2012-01-05 | |||
| US20200358464A1 | 2020-11-12 |
Attorney, Agent or Firm:
BEIJING ZBSD PATENT & TRADEMARK AGENT LTD. (CN)
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