Electroacoustic Resonator Layout for Harmonic Suppression
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Solution Overview
Problem
Existing electroacoustic resonators in wireless communication devices generate harmonics that interfere with other signals, leading to performance degradation.
Innovation Solution
The implementation of electrode fingers with wave shapes and gap reflectors in an electroacoustic resonator structure to suppress harmonics, including interleaved electrode fingers with varying lengths forming wave patterns and additional gap reflectors to manage acoustic wave propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional electroacoustic resonators are used, then the device size can be reduced, but harmonic interference is generated that degrades performance
Solution Approach 1:
The patent converts the harmful harmonic waves into beneficial reflected waves by introducing reflector structures. The reflectors are positioned to reflect harmonic waves back into the acoustic path, where they interfere destructively with other harmonics, thereby converting the harmful harmonic energy into a useful suppression mechanism that improves overall filter performance
Solution Approach 2:
The patent introduces reflector structures as intermediary elements between the electroacoustic resonator and the acoustic environment. These reflectors act as mediators that manipulate harmonic wave propagation by reflecting them at specific angles and positions, thereby controlling the harmonic behavior without directly modifying the resonator itself
2Reliability
If electrode fingers are extended to improve coupling, then acoustic wave confinement improves, but harmonic generation increases
Solution Approach 1:
The patent applies local quality by varying the electrode finger lengths rather than using uniform lengths throughout. This creates different local acoustic characteristics along the electrode structure, with shorter fingers generating weaker harmonics and longer fingers providing better coupling, thereby achieving a balance between confinement and harmonic suppression through spatially differentiated design
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
Significantly reduces harmonic interference, enhancing the performance and efficiency of wireless communication devices by confining acoustic waves within the desired frequency range.
Implementation Method 1
Using a piezoelectric material as a vibrating medium, acoustic resonators operate by transforming an electrical signal wave that is propagating along an electrical conductor into an acoustic wave that is propagating via the piezoelectric material.
Implementation Method 2
a first plurality of gap reflectors parallel to the first busbar, the first plurality of gap reflectors positioned in a first barrier region between the first busbar and the electrode fingers coupled to the second busbar
Data Source
AI summary
Aspects of the disclosure relate to wireless communication, and high-frequency filters with resonators. One aspect is a device including first and second busbars, and electrode fingers coupled between the busbars, with electrode fingers extending different distances toward an opposite busbar such that a second end of each of the electrode fingers collectively form wave shapes. The device further includes pluralities of gap reflectors positioned between the wave shapes and a nearest busbar.