Advanced Multiphysics Camouflage Based on Low‐Emissivity Meta‐surface Coupled with Wave‐Absorbing and Thermal‐Insulating Aerogel

Abstract

Abstract The irreconcilable camouflage mechanisms of radar and infrared spectroscopy present substantial challenges to integrating multi‐physics field cloaking technology. Although aerogels possess both microwave dissipation and thermal insulation, higher infrared emissivity restrict further amelioration in compatible stealth field. Herein, we propose a bilayer configuration comprised of aramid nanofiber (ANF) aerogel and infrared shielding meta‐surface (ISM). The top ISM with low‐pass filtering capabilities is engineered to regulate emissivity while remaining transparent to microwaves. While the bottom quaternary ANF aerogels with radar dissipation and thermal insulation are synthesized by multi‐scale design strategy and heterogeneous surface engineering. Through theoretical and experimental optimization, the assembled compatible stealth composite achieves a near‐perfect absorption in X‐band, while the synergy of low emissivity and thermal insulation facilitates concealment in infrared windows. Specifically, the minimum reflection loss (RL) reaches −32.44 dB, effective absorption bandwidth (EAB) expands to 3.69 GHz (8.71–12.40 GHz), and the integration of effective reflection loss value ( ΔH ) increases to 9.92 dB GHz mm −1 . Additionally, low thermal conductivity (0.0288 W (m K) −1 ) and average infrared emissivity (0.23 in 3–5 µm and 0.25 in 8–14 µm) can reduce infrared radiation energy by 68.1%. This research provides a new thought for the design of multispectral camouflage and demonstrates enormous potential in stealth technologies.