Research Of Microwave Absorber For ETC

Electronic Toll Collection(ETC) is an important application of intelligent transportation system. The vehicle can pass a Toll plaza and automatic Toll station at normal speed. The short-range communication can be realized by dedicated short range communication(DSRC) system working on 5.8 GHz. However, the multiple reflection from the pavement and the specular scattering of electromagnetic waves from the other facilities will cause undesired communicate. The absorbing material can be used as a solution to solve these problems. In this paper, we fabricated composite absorber based on magnetic materials and dielectric material depending on theory. We analyzed the influence of electromagnetic parameters and other factors, such as the thickness of the material on the properties of absorbing materials and optimized the performance of the material. We also combine the traditional material with metamaterial absorber researching its characteristics by simulation.In this paper, on the basis of predecessors’ reaserch, we select carbonyl iron powder compounded with TiO2 and BaTiO3, respectively. We fabricated absorber for ETC with high absorption. It was found that when the proportion of carbonyl iron powder is increased in composite material, the loss peaks move to low frequency. Seventy percent is the most suitable ratio for Fe. Decrease the thickness of the material sample can shift the matching frequency to high frequency. The change of carbonyl iron powder microstructure can make the loss move to low frequency. We can decrease the thickness of the material effectively using this rule, reducing the production cost.In this paper, we combined the traditional absorbing material prepared and metamaterial absorber to design a two-layer composites absorber, trying to research its new performance. the square shape metamaterials structure, composite absorbing device can produce very wide bandwidth consumption, for the flower petal shape metamaterials structure, within the simulation spectrum appearring two super absorption peak, the effective bandwidth is close to 3 GHz, the emergence of these new features for composite materials for further optimization design can undoubtedly provide strong support.