Bioinspired 4D‐Printing Microwave Absorbers With Adaptive Programmable Switches via Morphable Percolation Networks and Resonant Models

Abstract

ABSTRACT The escalating demand for intelligent stealth systems necessitates a paradigm shift from static absorbers to dynamic devices with autonomous and reversible control. Addressing challenges of fixed structure‐frequency relationship, we draw direct inspiration from the adaptive coloration of cephalopod skin, which achieves dynamic stealth through reconfiguration of subcutaneous photonic structures. Following this principle, we design a programmable electromagnetic switch via a 4D‐printing strategy, which promotes R6M matrix mixed with carbonyl iron directional arrangement. This design enables precise morphological control of absorbers based on a thermally convective temperature gradient by inducing metastable configurations of liquid crystal elastomer. The macroscopically topological reconfiguration and microscopical changes of percolation network both contribute to a dramatic, reversible modulation of electromagnetic characteristics. Consequently, the resonant frequency can precisely convert within X and Ku bands, with the minimum reflection loss enhanced from −30.22 to −61.4 dB and the effective bandwidth enlarged from 8.52 to 11.37 GHz. Notably, this system exhibits excellent cyclic‐stability over 100 times, establishing a robust electromagnetic switches. Our work establishes a deterministic mapping between thermal excitation, metastructure geometry, and electromagnetic behaviors, enabling precise and predictable tuning. This paradigm offers inspiration for next‐generation electromagnetic protection, with clear potential for integration into adaptive cloaking systems.