Preparation of biological absorbing particles

Particles of electromagnetic wave absorbing take a key effect on the electromagnetic protection and the radar wave absorbing. In this paper, microorganisms are used as the substrate of the sol-gel coating processing. A layer of Fe₃O₄ was deposit on the microbial surface, and the corresponding absorbing particles are prepared. Developing the study of the morphology, composition, microwave magnetic parameters. Experiments show that the layer of bio-absorbing particles, spinel ferrite Fe₃O₄, whose thickness is less than 3 microns. Spiral-shaped biological absorbing particles, coated with ferrite, have a good performance. Silicone rubber is used as a binder prepared by 1.2 mm thick mixed spiral of absorbing particles coating. The results showed that the reflective losses are more than -10 dB in 10-16 GHz.