Synergistic Hollow Structure Design and Defect Engineering in Dandelion‐Like α‐MnO 2 for Superior Radar‐Infrared Compatible Camouflage

Abstract Radar‐infrared compatible materials have emerged as a pivotal research focus on developing next‐generation multispectral stealth technologies. However, achieving high‐performance compatible stealth in a single integrated coating remains a significant challenge. This study proposes the design of a unique ion‐modulated α‐MnO 2 with a dandelion‐like hollow structure, which functions as a promising filler to achieve superior radar‐infrared compatible stealth property in a single‐layer coating using epoxy resin as the binder. The intriguing phenomenon is primarily attributed to the synergistic effects of multitiered hollowness and defects induced by low‐valence cation doping, which enhance polarization loss behaviors and further reduce thermal conductivity. As a result, the remarkably broadband microwave absorption (RL←10 dB) of 8.9 GHz is achieved, covering most of X/Ku bands. Meanwhile, the thermal conductivity coefficient ( λ ) of the coating is prominently reduced from 0.59 to 0.31 W m −1 K −1 , with actual thermal radiation signals being visually suppressed. Therefore, this work presents a significant solution to address the inherent microwave absorption incompatibility of conventional thermal insulation coatings, offering a new strategy in exploring advanced multispectral stealth materials.