Design paradigm for strong-lightweight perfect microwave absorbers: The case of 3D printed gyroid shellular SiOC-based metamaterials

Multifunctional Metamaterial Microwave Blackbody with High‐Frequency Compatibility, Temperature Insensitivity, and Structural Scalability

“…[ 7 ] Metal‐backed absorbers combine the material's inherent dissipation with beneficial destructive interference to accomplish effective microwave absorption, but they suffer disadvantages such as narrow bandwidth, poor structural scalability, and high‐temperature sensitivity. [ 8 ] At the same time, their metal backplane dependence renders them inapplicable to high‐temperature environments. For metal‐backed absorbers heavily dependent on destructive interference, either the temperature‐induced slight variation in the electromagnetic properties of constituent materials or the worsening conductivity of metal backplanes may seriously deteriorate their practical MA performance, thus dramatically restricting their working temperature range and application scenarios.…”

“…[ 13a,b,15 ] Non‐resonant all‐dielectric MAMMs stand out as a more elegant strategy for realizing deterministic MA performance based on the effective medium theory. [ 8a,11c,15a,16 ] Parameterizable TPMS (i.e., triple periodic minimum surfaces) shellular microlattices, provide structural bases for parametrically building microwave blackbodies. [ 17 ] Among these, Gyroid shellular (GS) exhibits superior comprehensive properties over other counterparts due to its high isotropy, stiffness, and suitability for fabrication processes based on additive manufacturing (AM).…”

“…[ 17 ] Among these, Gyroid shellular (GS) exhibits superior comprehensive properties over other counterparts due to its high isotropy, stiffness, and suitability for fabrication processes based on additive manufacturing (AM). [ 8a,18 ] Recently, we have parametrically constructed high‐performance GS MAMMs via optimization of structural relative density (RD, equivalent to the solid volume fraction). [ 8a ] Likewise, functionally‐driven variable‐density TPMS shellular structures can also be parametrically generated to realize stepwise gradient impedance.…”

“…[ 8a,18 ] Recently, we have parametrically constructed high‐performance GS MAMMs via optimization of structural relative density (RD, equivalent to the solid volume fraction). [ 8a ] Likewise, functionally‐driven variable‐density TPMS shellular structures can also be parametrically generated to realize stepwise gradient impedance. [ 17a ]…”

“…This work aimed at realizing the broadband microwave blackbody behavior through the integration of graded Gyroid‐shellular (GGS) metastructure design and additive manufacturing of polymer‐derived SiOC ceramics (PDCs‐SiOC). [ 8a,19 ] Initially, GGS structures were parametrically generated via varying level‐set constants, with the corresponding RD gradient being adjusted by level‐set constant curvature, and the influence of the RD gradient on electromagnetic responses was investigated by simulation. Following, the one‐step fabrication of GGS‐structured SiOC MMBs was realized by AM followed by chemical‐vapor‐infiltration (CVI) of a Si 3 N 4 coating, and the corresponding electromagnetic response properties were experimentally investigated from room temperature (RT) to 500 °C.…”