Constructing angular conical FeSiAl/SiO2 composites with corrosion resistance for ultra-broadband microwave absorption

• FeSiAl/SiO 2 (FSA/SiO 2 ) composites were prepared by a facile stirring process. • The electromagnetic parameters of FSA/SiO 2 can be adjusted by the TEOS. • The quadrilateral cone based on the FSA/SiO 2 achieves the broad effective absorption bandwidth of 16.3 GHz. In this work, a quadrilateral cone structure based on the FeSiAl/SiO 2 composites was designed by Computer Simulation Technology (CST), which shows an ultrabroad EAB of 16.3 GHz. Nowadays, the scholars have studied many microwave absorbing materials (MAM) to solve the increasingly serious electromagnetic wave pollution, however, most of MAM are difficult to achieve the ultra-broad band absorption. In this work, we explored the practical applications of the inexpensive FeSiAl (FSA) by using the efficient electromagnetic simulation software, the Computer Simulation Technology (CST). Specifically, FeSiAl/silicon dioxide (FSA/SiO 2 ) microwave absorbers were successfully prepared by a simple stirring method. The obtained FSA/SiO 2 samples achieved a reflection loss (RL) of − 46.6 dB at 9.71 GHz. In addition, a quadrilateral cone model was established by the CST, and the influence of angular cone parameters on absorption performance was investigated in detail through electromagnetic simulation. It is found that the model exhibited extraordinary absorption ability and the effective absorption bandwidth (EAB) reached 16.3 GHz covering 2–18 GHz when the height (H), thickness (t), length (L) were set as 1.9 cm, 0.2 cm, 1 cm, respectively. This work may solve the shortcoming of the narrow absorption band of the absorption powders.