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 cutting type, electrode material, metallization ratio, and film thickness variations on the acoustic velocity and electromechanical 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 investigated the impact of different structures on the transverse mode of the resonator A0 mode Lamb wave to achieve clutter suppression.