Title:
XBAR FILTER
Document Type and Number:
WIPO Patent Application WO/2023/071516
Kind Code:
A1
Abstract:
An XBAR filter (100), comprising a piezoelectric substrate (11), at least two interdigital transducers (12) formed on the piezoelectric substrate (11), and at least two insulating layers (13), wherein the insulating layers (13) and the interdigital transducers (12) are arranged in a one-to-one correspondence mode; each interdigital transducer (12) and the corresponding insulating layer (13) thereof, and the piezoelectric substrate (11) are used for forming a resonator; each insulating layer (13) is arranged between the corresponding interdigital transducer (12) and the piezoelectric substrate (11), or is arranged on the side of the piezoelectric substrate (11) opposite to the corresponding interdigital transducer (12); and the thicknesses of the insulating layers (13) corresponding to the at least two interdigital transducers (12) are different. By means of the described mode, the resonators having different resonance frequencies can be formed on the same piezoelectric substrate (11), thereby satisfying the requirements of a trapezoidal filter.
Inventors:
HU JINZHAO (CN)
GUO JIASHUAI (CN)
GUO JIASHUAI (CN)
Application Number:
PCT/CN2022/116493
Publication Date:
May 04, 2023
Filing Date:
September 01, 2022
Export Citation:
Assignee:
LANSUS TECH INC (CN)
International Classes:
H03H9/02
Foreign References:
| CN216390939U | 2022-04-26 | |||
| JP2020182130A | 2020-11-05 | |||
| CN108449068A | 2018-08-24 | |||
| CN110572138A | 2019-12-13 | |||
| US20140368296A1 | 2014-12-18 |
Attorney, Agent or Firm:
SHENZHEN JUNXINCHENG INTELLECTUAL PROPERTY FIRM (GENERAL PARTNERSHIP) (CN)
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