| Summary: | Recently, lightweight multifunctional metastructures have attracted significant attention owing to its advantage of integrating microwave absorption and mechanical resistance. However, these features are typically entangled, and a feasible strategy for independently manipulating the microwave absorption and mechanical resistance is still lacking. Herein, a double high-impedance surface-loaded honeycomb (DHHC) is proposed, based on a theoretical analysis, and fabricated using a 3D printing technique. The impedance and surface current distribution of the DHHC were analyzed and investigated to achieve broadband microwave absorption characteristics. The structural parameters and resistances of the high-impedance surface were investigated and optimized to regulate the absorbing bandwidth and reflectivity intensity. Our experimental results indicated that a 4.25 mm thick DHHC metastructure can achieve a –10 dB absorbing bandwidth at a frequency range of 6.73–18 GHz, as well as a –15 dB absorbing band at 8.42–14.75 GHz. Moreover, the structural parameters of the honeycombs were investigated for the adjustment of stress distributions during the compression and flexural processes. Load-bearing tests indicated that the DHHC possessed a mechanical resistance with an equivalent areal density of 2.32 kg/m2. This study provides a promising route for achieving independently manipulated compatibility between microwave absorption and mechanical resistance for practical applications.
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