Broadening and Optimizing Microwave Absorbing Bandwidth by Metamaterial Unit Contour Method

A metamaterial absorber was designed which is constituted of metal resonance unit, FR4 substrate and metal backing. The S parameters and reflectivity characteristics were calculated by means of the numerical simulation method in 2-8 GHz. The model was outlined and calculated again, the results show that the contour treatment, on the whole, has no effect on the resonance frequency. Based on this, dual band microwave attenuation absorption is achieved by virtue of combining other resonant metamaterial unit into the former unit contour, which provides an excellent technological approach to further study the broadband microwave absorbing materials. The samples of all the simulation model are verified by laser etching technology and the calculation results match very good with the experimental results, which verifies the technological thinking of metamaterials contour broadening the wave absorbing materials and paves a good path to broaden the bandwidth of microwave absorbing.