Integrated Electromagnetic Wave Absorption‐Transmission via 3D‐Printed Bilayered Metamaterial

ABSTRACT Achieving integrated absorption and transmission of electromagnetic waves (EMW) remains challenging due to the inherent contradiction between the high loss required for absorption and the near‐zero loss essential for transmission. To overcome this limitation, we designed a bilayered 3D‐printed metamaterial consisting of a top Schwarz‐P‐structured dielectric absorber and a bottom frequency‐selective surface (FSS) acting as a reflective filter. The synergistic material composition combined with triply periodic minimal surface geometry enables excellent impedance matching, facilitating low‐frequency transmission and high‐frequency absorption. The FSS transmits low‐frequency signals while reflecting high‐frequency waves for re‐absorption, allowing the metamaterial thickness to be reduced by half without compromising absorption performance. The resulting structure, with a total thickness of only 6 mm, achieves a transmission bandwidth of 3.5 GHz (3.5–7 GHz) and an absorption bandwidth of 6 GHz (12–18 GHz), outperforming existing frequency‐selective rasorber in both bandwidth and thickness. This material demonstrates strong potential for applications in low‐observable radomes and modern communication systems.