Multifunctional Metamaterial for Simultaneous Broadband Electromagnetic and Acoustic Absorption

In this paper, a metamaterial based on honeycomb-structured printed high-resistance carbon paste and frequency-dispersed magnetic material (FDMM) three-dimensional periodic electromagnetic structure composite with multi-sized Helmholtz resonance cavities is designed to achieve dual absorption of electromagnetic and acoustic waves over a wide frequency range. Simulations show that the absorber demonstrates at least -10 dB reflectivity over 0.85 GHz-20 GHz, covering an extremely wide band from L to Ku; Meanwhile, by designing only 3 parallel Helmholtz resonance cavities, the structure achieves a sound absorption coefficient of more than 0.8 in the frequency band of 571Hz-791Hz.And the height of the proposed structure is only 27.8 mm. This multifunctional metamaterial design idea has great potential value for acoustic and electromagnetic composite stealth.