Diamond Electroacoustic Resonator for High-Frequency SAW Filtering
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Solution Overview
Problem
Current surface acoustic wave filters face challenges in increasing operating frequency and improving the Q-factor to keep pace with rising carrier frequencies and data rates in wireless data transmission systems.
Innovation Solution
The development of an electroacoustic resonator comprising a diamond layer and a piezoelectric layer, where the diamond layer is deposited heteroepitaxially on a substrate and then separated to allow for the deposition of a second substrate, enhancing acoustic energy confinement and reflection, thereby increasing the operating frequency and Q-factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface acoustic wave filters are used for wireless data transmission, then data transmission function is provided, but operating frequency and Q-factor are insufficient for increasing carrier frequencies and data rates
Solution Approach 1:
The patent changes the material parameter of the resonator from conventional piezoelectric materials to diamond, which has fundamentally different acoustic and mechanical properties. This parameter change enables both higher operating frequencies and improved Q-factor, resolving the contradiction between reliability and productivity
Solution Approach 2:
The patent uses a composite structure combining diamond layer with piezoelectric layers (such as AlN) to create an electroacoustic resonator. This composite material approach leverages the high acoustic velocity of diamond for frequency enhancement while maintaining piezoelectric coupling for effective operation, simultaneously achieving both higher operating frequency and Q-factor
2Reliability
If diamond layer is deposited heteroepitaxially on substrate, then acoustic energy confinement is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by depositing the diamond layer heteroepitaxially on the substrate before removing the substrate. This sequence ensures proper crystal orientation and acoustic energy confinement is established early in the manufacturing process, while the substrate removal is performed as a subsequent step to free the diamond layer for final device assembly
Solution Approach 2:
The patent extracts the substrate after diamond layer deposition to create a free-standing diamond layer. This extraction step removes the substrate that is no longer needed, simplifying the final device structure while maintaining the acoustic energy confinement properties established during heteroepitaxial growth
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
This configuration enables the electroacoustic resonator to operate at higher frequencies with improved Q-factor, ensuring reliable channel separation in telecommunication systems by effectively confining and reflecting acoustic energy within the diamond layer.
Implementation Method 1
Surface acoustic waves can be generated in the diamond by applying an alternating electric field to this piezoelectric layer
Implementation Method 2
Surface acoustic waves can be generated in the diamond by applying an alternating electric field to this piezoelectric layer
Implementation Method 3
P. Kirsch et al.: '5 GHz surface acoustic wave devices based on aluminum nitride/diamond layered structure realized using electron beam lithography'
Data Source
AI summary
The invention relates to a method for manufacturing an electroacoustic resonator comprising the steps of: Providing a first substrate having a first side and an opposite second side; depositing a diamond layer having a first side and an opposite second side on said first substrate, wherein the second side of the diamond layer is in contact with said first side of the first substrate; removing the first substrate; forming a piezoelectric layer on the second side of the diamond layer; applying a second substrate to the first side of the diamond layer.