Abstract
Frequency-selective surfaces (FSSs) with in-band electromagnetic (EM) wave transmission and out-of-band electromagnetic waves shielding properties are highly demanded. The recent rise of metacomposites offers a new way to construct FSSs which integrates double negative electromagnetic property and electromagnetic interference (EMI) performance in one material. Herein, the buckypaper (BP)/yttrium iron garnet (YIG)-graphene aerogel (GA)/BP metacomposites with sandwich structure were constructed in this research. The combined effects of conductive networks formed in BP and GA, and the magnetic resonance of YIG particles led to double negative performance of composites with 30 wt% YIG content from 810 MHz to 1 GHz. Besides, the composite exhibited great EMI properties derived from poor impedance match and good microwave absorption. With negative refraction and interference of microwaves in different frequency range, this metacomposite provides a novel approach for the construction of frequency-selective surfaces.
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