Research On The Structural Design And The Absorbing Performance Of Epoxy Resin On Microwave Absorption Plates

With the development of science and technology and especially the electronic technology, many kinds of electronic appliances are used. Electric products which are more and more applied to people’s production and life make great contributions to human civilization and progress. However the electromagnetic wave mutual interference and the impact on the environment have brought great harm to human survival and development. Electromagnetic wave absorbing and protection attract people’s attention. So the development of the electromagnetic shielding and absorption materials seem to be more and more important.In this paper, the absorption coatings with different structures, filling ratio and thickness are prepared based on the epoxy mixing with CFP, CB and CIP. Moreover the structures and performances of the absorbents mentioned above were stated by electronic instruments, such as transmission electron microscope, scanning electron microscope and so on. Meanwhile the influence on the microwave wave absorbing caused by the coatings structure, filling ratio and thickness were studied.Studies showed that CIP was both dielectric loss and magnetic loss materials, but to give priority to the magnetic loss. Its special stroboscopic effects could broaden the absorption band. The CB particles have good dielectric properties. But the absorption bandwidth of CB was very thin. The CFP as dipoles or harmonic oscillators avoided to produce continuous conducted current due to the random distribution in the matrix and generated polarization dissipative current under the impressed electromagnetic field. The dissipative current was attenuated to transfer into heating energy under the surrounding matrix.Through adjusting the content of matching layer, we prepare double layer absorbing coatings to improve the impedance matching. What we have done this is to make the more microwave inter the absorbing coatings and to use the absorbents more efficiently. Moreover this performance is the important factor to consider for designing absorbing composites coatings. Through changing the content of the CFP in the absorption layer, the absorption efficiency was increased to achieve the aim for thin, light, wide and the purpose of the strong. The absorption properties of the coatings first increased, and then decreased with the increase of the CFP content. When the weight content of CFP was0.25:0.25:1(CFP:CB:ER) in the absorption layer, the double-layer coating showed an excellent absorbing properties with the peak value of-25dB at11GHz and the bandwidth(RL<-10dB) of4.5GHz.