A Novel Ultra‐Wideband Electromagnetic‐Wave‐Absorbing Metastructure Inspired by Bionic Gyroid Structures

Abstract

Traditional honeycomb‐like structural electromagnetic (EM)‐wave‐absorbing materials have been widely used in various equipment as multifunctional materials. However, current EM‐wave‐absorbing materials are limited by narrow absorption bandwidths and incidence angles because of their anisotropic structural morphology. The work presented here proposes a novel EM‐wave‐absorbing metastructure with an isotropic morphology inspired by the gyroid microstructures seen in Parides sesostris butterfly wings. A matching redesign methodology between the material and subwavelength scale properties of the gyroid microstructure is proposed, inspired by the interaction mechanism between the microstructure and the material properties on the EM‐wave‐absorption performance of the prepared metastructure. The bioinspired metastructure is fabricated by additive manufacturing (AM) and subsequent coating through dipping processes, filled with dielectric lossy materials. Based on simulations and experiments, the metastructure designed in this work exhibits an ultrawide absorption bandwidth covering the frequency range of 2–40 GHz with a fractional bandwidth of 180% at normal incidence. Moreover, the metastructure has a stable frequency response when the incident angle is 60° under transverse electric (TE) and transverse magnetic (TM) polarization. Finally, the synergistic mechanism between the microstructure and the material is elucidated, which provides a new paradigm for the design of novel ultra‐broadband EM‐absorbing materials.

Multifunctionality of Additively Manufactured Kelvin Foam for Electromagnetic Wave Absorption and Load Bearing

“…Considering this trend, the KF-EMA would be beneficial in the repetitive loading environments or irregular loading disturbances. Lastly, the comparison table with other studies presents the outstanding characteristics of KF-EMA representing the 3D-printed RAS employing bending-dominated structures, in terms of facile fabrication, scalable material selection, and multifunctionality [15,[40][41][42][43][44][45][46] (Table S1, Supporting Information).…”

Strategies to construct conductive structures of polymer-based electromagnetic wave attenuation composites

“…The remaining unconsumed electromagnetic wave will pass through the material and will be transmitted into the air. 1–5 The EMW attenuation mechanism is depicted in Fig. 1a.…”

Mechanical metamaterials as broadband electromagnetic wave absorbers: investigating relationships between geometrical parameters and electromagnetic response

“…Recently research has begun to explore the potential of 3D printed structures to achieve multifunctionality. This is achieved by employing lightweight, load-bearing mechanical metamaterials as EMA, such as gyroid, 24 octet-truss, 25 and kelvin-foam 26 structures. Similar to honeycomb design, these structured porous mechanical metamaterials enable enhanced attenuation through structural absorption.…”

“…For instance, An et al demonstrated a gyroid-structured 3D printed metasurface capable of achieving a broadband reflection loss (−10 dB) across a 2–40 GHz range. 24 Their study examined the impact of various geometrical parameters, such as volume fraction, strut/sheet configurations in gyroid, and unit cell length, on attenuation performance. The octet-truss, recognized for its low-density and robust mechanical, has also shown significant promise as an effective multifunctional EMA 25 offering improved isotropic mechanical strength and EM wave absorption due to its unique unit cell geometry.…”