Absorbing Properties Of Conventional Microwave Absorbing Material Optimized By Metamaterials

With the rapid development of electronic science and technology,microwave absorbing materials in the field of military and civilian defense stealth electronic device applications we have made great strides.Microwave absorbing material is the ability to effectively absorb the incident electromagnetic wave,electromagnetic loss through a variety of materials,the incident electromagnetic wave energy into heat or by electromagnetic interference disappear.From conventional ferrite,polycrystalline fibers,carbon black and other absorbent to the nanometer microwave absorber in recent years,there are still large thickness of the coating,the absorption band of high surface density,and absorbing capability is not strong enough,and other issues.Therefore,the development of a new generation and high-performance absorbing material is significance and broad application prospects.In this paper,the layer spacing of graphite oxide is used to make the transition metal salt intercalated into graphite oxide,and the transition metal/graphite oxide nanocomposites are produced by H2 heating and reduction.On the basis of the transition of metal/graphite oxide nanocomposite microwave absorption properties,using three types of materials to be regulated and ultra-conventional microwave absorbing material to enhance absorption.Meta-material means a synthetic material having a structure in nature natural materials do not have extraordinary physical properties,generally has a structure formed by a periodic arrangement of some units,and can be adjusted according to the characteristics required by its critical size to achieve.Fe Ni/graphite oxide nanocomposite was prepared,based on the previous work of the experimental group.As such materials for the microwave absorbent,having a small surface density,higher bandwidth,return loss over a new microwave absorbing nanomaterial.It focuses on the Ni/graphite oxide reduction temperature under different nanocomposites basic electromagnetic parameters and microwave absorption properties.This paper uses three microwave metamaterials coating material control,achieve the purpose of enhancing conventional microwave absorbing material.Wherein,based on a meta-material split ring resonators(SRRs)structure,the super material is directly superimposed on a conventional absorbing materials;rectangular patch based on a meta-material structure and a circular patch based on the meta-material is embedded into the routine Fe Ni/graphite oxide nanocomposite absorbing material coating,forming a sandwich structure.The results show that the split ring metamaterial can significantly enhance the absorption capacity of the micro-Bo conventional materials,and is a significant absorption band to the low frequency movement;rectangular patch on the meta-material structure of regulation can significantly absorb the low frequency band to move and adjust the rectangle patch size capable of modulating the microwave absorption properties;similarly based on a circular piece of meta-material posted result of regulatory rectangular patch.In this paper,in order to complete the implementation within 2-8GHz reflection losses below the target range of-10dB,we use conventional materials absorbing capability better carbonyl iron magnetic coating material to replace Fe Ni/graphite oxide nanocomposite microwave,and a rectangular patch of multilayer structure in composite material superimposed manner.The development of a low-frequency absorption can significantly broaden the scope to achieve 2-8GHz full-band absorption,and the production method is simple,low-cost composite microwave absorber.