SURFACE ACOUSTIC WAVE FILTER - SHANGHAI INSTITUTE OF MICROSYSTEMS AND INFORMATION TECH CHINESE ACADEMY OF SCIENCES

Title:

SURFACE ACOUSTIC WAVE FILTER

Document Type and Number:

WIPO Patent Application WO/2024/041114

Kind Code:

A1

Abstract:

A surface acoustic wave filter, comprising: a support substrate (10), a piezoelectric layer, a resonator member (20) and a spurious-mode suppression member (30), wherein the piezoelectric layer is arranged on the support substrate (10); the resonator member (20) is arranged on the support substrate (10); one end of the spurious-mode suppression member (30) is connected to an output end of the resonator member (20), and the other end of the spurious-mode suppression member (30) is grounded; and the frequency where the resonance peak of the spurious-mode suppression member (30) is located is consistent with the center frequency of a high-frequency spurious mode of the resonator member (20), and when the lowest frequency excitation mode of the spurious-mode suppression member (30) is a zero-order horizontal shear wave mode, the wavelength of the spurious-mode suppression member (30) does not exceed the wavelength of the resonator member (20) by a first preset numerical multiple, and when the lowest frequency excitation mode of the spurious-mode suppression member (30) is a high-frequency spurious mode, the wavelength of the spurious-mode suppression member (30) does not exceed the wavelength of the resonator member (20) by a second preset numerical multiple. The surface acoustic wave filter can effectively suppress a high-frequency spurious mode caused by the characteristics of the material of a surface acoustic wave resonator, such that the performance of the surface acoustic wave filter is improved.

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WO/1996/014589	MOBILE TRANSPONDER REMOTE IDENTIFICATION PROCESS
JP4696312	Dural Track SAW Reflector Filter with Weighted Reflective Grating

Inventors:

OU XIN (CN)
SUI DONGCHEN (CN)
ZHANG SHIBIN (CN)
ZHENG PENGCHENG (CN)
SUN MIJING (CN)

Application Number:

PCT/CN2023/099893

Publication Date:

February 29, 2024

Filing Date:

June 13, 2023

Export Citation:

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Assignee:

SHANGHAI INSTITUTE OF MICROSYSTEMS AND INFORMATION TECH CHINESE ACADEMY OF SCIENCES (CN)

International Classes:

H03H9/64; H03H9/05; H03H9/145

Foreign References:

CN115425945A	2022-12-02
CN113708739A	2021-11-26
CN109792239A	2019-05-21
JPH06291600A	1994-10-18
JP2008283337A	2008-11-20

Attorney, Agent or Firm:

SCIHEAD IP LAW FIRM (CN)

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