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Here, we propose a dense\u2010stacked polygonal hollow\u2010shell cavity absorber and establish an acoustic\u2010to\u2010electromagnetic cavity mapping framework to guide its design. Rather than directly transplanting acoustic resonators into electromagnetics, the proposed framework is built on the transferable wave\u2010governing ingredients shared by the two systems, namely impedance discontinuity, phase accumulation, effective propagation length, and cavity\u2010assisted confinement. Based on this framework, tessellation is reinterpreted not merely as a packing condition but as an electromagnetic coupling mechanism that suppresses lateral leakage and strengthens inter\u2010unit confinement. Carbon\u2010black\u2010filled PLA\/TPU composites are first screened as cavity\u2010compatible lossy media, and CB5 is identified as the optimal formulation because it provides the best balance between attenuation and impedance matching. Structural comparison among triangular, quadrilateral, and hexagonal tessellable cavities further shows that the hexagonal topology offers the most favorable combination of coupling aperture, path diversity, and dense\u2010packing\u2010induced confinement. The optimized hexagonal hollow\u2010shell array achieves superior broadband absorption, maintains effective performance under oblique incidence, and exhibits reduced radar scattering. This work advances structural absorber design from empirical geometry optimization toward a physically interpretable topology\u2010driven route.<\/jats:p>","DOI":"10.1002\/smtd.70862","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T06:41:35Z","timestamp":1784270495000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Tessellation\u2010Enabled Hexagonal Hollow\u2010Shell Cavity Arrays for Broadband Microwave Absorption via Acoustic\u2010to\u2010Electromagnetic Cavity Mapping"],"prefix":"10.1002","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3801-8690","authenticated-orcid":false,"given":"Shaokang","family":"Liu","sequence":"first","affiliation":[{"name":"College of Mechanical and Electrical Engineering Central South University  Changsha P. R. 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