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Here, 3D\u2010printed metacomposites achieving low\u2010frequency ultra\u2010thin ENZ absorption (&gt;90%, 55\u2013110\u00a0MHz, d\/\u25b3\u03bb&lt;1\/2455) are realized by confining high\u2010entropy alloy (HEA) nanoparticles within hierarchically ordered porous carbon (HOPC). This hierarchical design leverages HEA's flattened band structures to maximize electron effective mass, while interfacial electron redistribution at HEA\u2010carbon boundaries delocalizes charges and reduces carrier concentration. These dual effects synergistically suppress plasma frequency to 72.4\u00a0MHz, converting strong negative permittivity into near\u2010zero states. A cocktail effect is discovered for reducing the plasma frequency with increasing the entropy. Concurrently, resonant enhancement from three complementary mechanisms\u2014surface plasmons at HEA@graphitic core\u2010shell interfaces, interfacial polarization in PU\/HOPC heterojunctions, and hierarchical pore\u2010cavity modes\u2014boosts positive permittivity. Engineered cancellation of weakened negative permittivity and reinforced positive permittivity enables an ultra\u2010broadband |\u03b5'|&lt;1 response spanning 55\u2013110\u00a0MHz. The ENZ\u2010mode perfect absorption of ultra\u2010thin thickness, ultralow frequency, angle robustness, and broad band is achieved eventually. This work establishes a new paradigm for breaking the Rozanov limit via material\u2010genesis ENZ engineering, bypassing artificial metamaterial arrays.<\/jats:p>","DOI":"10.1002\/adma.202516951","type":"journal-article","created":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T10:19:36Z","timestamp":1769595576000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Ultralow\u2010Frequency Epsilon\u2010Near\u2010Zero States in 3D\u2010Printed High\u2010Entropy Alloy Metacomposites for Ultra\u2010Thin Perfect RF Absorption"],"prefix":"10.1002","volume":"38","author":[{"given":"Peitao","family":"Xie","sequence":"first","affiliation":[{"name":"School of Materials Science &amp; Engineering Shandong University  Jinan China"},{"name":"Institute For Superconducting and Electronic Materials University of Wollongong  North Wollongong Australia"},{"name":"College of Materials Science &amp; Engineering Qingdao University  Qingdao China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haikun","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Materials Science &amp; Engineering Shandong University  Jinan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhenxiang","family":"Cheng","sequence":"additional","affiliation":[{"name":"Institute For Superconducting and Electronic Materials University of Wollongong  North Wollongong Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingxiang","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Materials Science &amp; Engineering Shandong University  Jinan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuan","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Materials Science &amp; Engineering Qingdao University  Qingdao 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