Thickness optimization towards microwave absorption enhancement in three-layer absorber based on SrFe12O19, SiO2@SrFe12O19 and MWCNTs@SrFe12O19 nanocomposites

Abstract

Abstract The present research has been focused on the evaluations of microwave absorption characteristics of three-layer absorber with the approach of thickness optimization. Enhancement in microwave absorption feature predominantly depend on different factors such as multiple internal reflections between layers, interfacial polarization, phase cancellations, conduction loss, shape anisotropy and so on. By inspiring of these factors SrFe12O19, SiO2@SrFe12O19 and MWCNTs@SrFe12O19 nanocomposites were synthesized via tartrate-gel, stober and sol-gel methods respectively. XRD, FESEM, VSM and VNA techniques were used to determine the structural, microstructural, magnetic and microwave absorption features. The microwave absorption behavior of combination of these compounds with different layer arrangement and thickness were optimized via CST studio software. The maximum RL is reached to -42 dB at 9.5\xa0GHz with 4.2\xa0GHz effective bandwidth which composed of three distinct resonance peaks at 9.5, 10.5 and 11.5\xa0GHz. It is expected that the three-layer absorbers with this arrangement is the excellent absorbers for X-band absorption applications.