Melamine/ZIF-67-derivatives based Z-shaped Metamaterial for Ultra-Broadband Microwave Absorber: Design from Microscopic Dielectric-Magnetic Coupling Effect to Macroscopic Artificial Engineered Structure

Abstract

Confronted with the increasing requirements of electromagnetic (EM) wave absorber utilized in complex environment, there emerge much research about the component and structure design for enhancing the EM response ability. Combining artificially engineered structures with electromagnetic (EM) wave absorption materials is an essential approach for significantly expanding the effective absorption bandwidth, here in this work Z-shaped 3D metamaterial filling with melamine/ZIF-67-derivatives are acquired by virtue of the integration of simulation design, experimental replication, and mechanism verification. MZ-600 based Z-shaped 3D metamaterial absorber exhibits outstanding performances (RLmin of -20.75 dB with EAB of 12 GHz at 6.5 mm) due to the synergistic loss from microscopic material loss to macroscopic structural consumption of incident EM wave. In details, magnetic/dielectric melamine/ZIF-67-derivatives are in charge of consuming the EM energy by means of the intrinsic loss of fillers, while the designed metamaterials are linked with broadened bandwidth via optimizing impedance match and manipulating EM field. In addition, ultra-wide angular adaptability ±70 o (15 o -85 o ) and polarization insensitivity (TE and TM) as well as large decrease of RCS values (42.86 dB•m 2 ) all demonstrate the potential of as-prepared metamaterial in practical applications. The results suggest that integrating microscopic fillers with artificially engineered structures is an attractive avenue to enable high-efficiency EM wave absorption performances.