Abstract
Composites with hollow structures have received attention worldwide for microwave absorption because of their light weight, high strength and unique wave absorption properties. In this study, the complex permittivity and complex permeability were determined for epoxy resin (EP) with different carbonyl iron particle (CIP) contents. These results were used to design a series of CIP/EP composites with novel lightweight lattice structures and different macrosized hollow spheres as fillers. Scanning electron microscopy (SEM) was used to analyze the morphology of these hollow spheres lattice composites, and the NRL-arc method was applied to study the microwave absorption. Compared with traditional solid structures, the CIP/EP hollow spheres lattice composites (80-wt% CIP/EP hollow spheres as filler and 40-wt%CIP/EP as matrix) exhibit unique microwave absorption performance with a minimum reflection loss (RL) of −20.8 dB and an effective absorption band (RL < -10 dB) of 2.6 GHz (11.3 GHz – 13.9 GHz).
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