Research on Low-Frequency Miniaturized Lamb Wave Resonator
In pursuit of overcoming challenges hindering the miniaturization of low-frequency acoustic devices with extensive bandwidth,this study investigated the excitation of the antisymmetric A0 Lamb wave mode utilizing a Y-cut lithium niobate piezoelectric film.The finite element method was then used to examine the structural design and conduct a theoretical analysis of the A0 mode.An assessment of various factors including lithium niobate cut-ting type,electrode material,metallization ratio,and film thickness variations on the acoustic velocity and electro-mechanical coupling coefficient revealed that the A0 mode Lamb wave exhibiteda lower acoustic velocity and larger electromechanical coupling coefficient compared to the conventional surface acoustic wave within a specific structure.This characteristic is advantageous for the miniaturization of low-frequency acoustic filters.Furthermore,we inves-tigated the impact of different structures on the transverse mode of the resonator A0 mode Lamb wave to achieve clutter suppression.
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