Multilayer vdW Acoustic Waveguides for Shear-Longitudinal Separation

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Solution Overview

Problem

Existing acoustic devices often operate based on either shear or longitudinal acoustic waves, necessitating separation or manipulation of these waves due to their distinct properties, which is challenging and affects device size, thermal dissipation, and performance.

Innovation Solution

Incorporation of multilayer van der Waals (vdW) materials in acoustic devices to manipulate, separate, or trap shear and longitudinal acoustic waves, improving device size, thermal dissipation, and performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If shear acoustic wave is used for acoustic device, then device size can be reduced, but wave velocity is slower and wavelength is shorter

Engineering Contradiction:

Improvedevice sizeVSAvoidwave velocity

Core Design Contradiction:

Volume of moving objectVSSpeed

Solution Approach 1:

The patent segments the acoustic wave propagation path by introducing a multilayer vdW material structure that separates shear wave and longitudinal wave paths. This allows the device to utilize shear waves for size reduction while using longitudinal waves for high-frequency operations, resolving the contradiction between device size and wave velocity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The multilayer vdW material acts as an intermediary that couples shear acoustic waves and longitudinal acoustic waves. It converts shear waves generated by IDTs into longitudinal waves that can propagate at higher velocities, thereby achieving both compact device size and high wave velocity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If longitudinal acoustic wave is used for acoustic device, then higher frequency operations are achieved, but device size increases due to longer wavelength

Engineering Contradiction:

Improvefrequency operation capabilityVSAvoiddevice size

Core Design Contradiction:

PowerVSVolume of moving object

Solution Approach 1:

The patent replaces the conventional direct mechanical coupling approach with a novel vdW material-based coupling mechanism. The multilayer vdW material enables efficient shear-to-longitudinal wave conversion through its unique mechanical properties, allowing compact high-frequency device operation without the size penalty of traditional designs.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If shear acoustic wave and longitudinal acoustic wave are separated, then each wave type can be optimized, but device complexity increases

Engineering Contradiction:

Improvewave manipulation performanceVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The multilayer vdW material serves multiple functions simultaneously: it acts as an acoustic wave separator, a wave converter, and a structural support layer. This multi-functionality enables effective shear and longitudinal wave separation and manipulation without proportionally increasing device complexity, as one material structure performs multiple critical roles.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Temperature

If multilayer vdW material is used to trap shear acoustic wave, then thermal dissipation is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvethermal dissipationVSAvoidmaterial layer precision

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent utilizes the inherent physical parameters of multilayer vdW materials, such as their acoustic impedance and thermal conductivity, to achieve effective shear wave trapping and thermal dissipation. By selecting materials with appropriate parameter ranges, the design achieves thermal management benefits while maintaining compatibility with standard manufacturing tolerances.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The use of multilayer vdW materials enhances the ability to manage acoustic waves, reducing device size and improving thermal dissipation and performance in acoustic devices.

Implementation Method 1

multilayer vdW material 10 that can reflect a shear acoustic wave 12 but will allow a longitudinal acoustic wave 14 to pass through

Methodology Applied

Scientific EffectShear acoustic wave reflection: Reflection

Implementation Method 2

The multilayer vdW material is configured to trap the shear acoustic wave within the dielectric layer

Methodology Applied

Scientific EffectAcoustic wave trapping: Physical Containment

Implementation Method 3

The multilayer vdW material is provided between the piezoelectric layer and the substrate to block the shear acoustic wave from entering the substrate

Methodology Applied

Scientific EffectAcoustic wave blocking: Filter (physical)

Data Source

PatentUS20250357909A1Acoustic devices incorporating multilayer van der waals material

Publication Date: 2025.11.20 QORVO US INC

AI summary

The present disclosure relates to acoustic devices incorporating a multilayer van der Waals (vdW) material(s). In various embodiments disclosed herein, a multilayer vdW material(s) is provided in various types of acoustic devices, such as surface acoustic wave (SAW) devices, bulk acoustic wave (BAW) devices, cross bulk acoustic resonator (XBAR) devices, and acoustic gyroscope devices, to help manipulate (e.g., separate, trap, guide, etc.) a shear acoustic wave(s) and/or a longitudinal acoustic wave(s) in the acoustic devices. By utilizing the multilayer vdW material(s), it is thus possible to improve size, thermal dissipation, and performance of the acoustic devices.