In the last decade, spinel structures have been widely explored due to widespread applications in the antibacterial nanocomposites, memory devices, catalysts, photocatalysts, high frequency devices, and electromagnetic absorbing materials. In this study, BaFe2O4 spinel structure were synthesized through the sol-gel method using low sintering temperature and then were identified by vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR), field emission scanning electron microscopy (FE-SEM), and vector network analyzer (VNA) analysis. Results showed that uniform and pure crystal structure of BaFe2O4 nanoparticles have been prepared base on the sol-gel method. Finally, BaFe2O4 nanoparticles were blended by silicone rubber to characterize microwave absorption properties of the nanocomposite at ku-band frequency. According to the VNA results, BaFe2O4/silicone rubber nanocomposite with 1.75 mm thickness absorbed more than 94.38% of microwave at ku-band frequency and the maximum reflection loss of the BaFe2O4/silicone rubber nanocomposite was -51.67 dB at 16.1 GHz.
