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Description
A novel underwater acoustic coating design is proposed based on a simplified periodic unit cell containing a single tilted cylindrical inclusion. Unlike conventional coatings employing vertically aligned cylindrical inclusions in compact unit cells, the present design introduces geometric asymmetry by orienting the inclusion at an angle within an enlarged unit cell, thereby modifying the wave-structure interaction mechanisms. Finite element simulations demonstrate that the proposed coating achieves near-unity absorption around 1 kHz and maintains a high absorption coefficient over a broad frequency range extending to several kilohertz. Compared with benchmark coating configurations that exhibit predominantly narrowband absorption, the present design provides a substantial enhancement in absorption bandwidth and overall acoustic performance. The improved response is attributed to symmetry-breaking induced by the tilted geometry, which promotes enhanced scattering, an increased effective propagation path, and resonance-assisted dissipation. In addition to improved acoustic performance, a single inclusion per unit cell significantly reduces structural complexity, offering practical advantages for fabrication and implementation.