应用于ETC系统的吸波材料研究

发布时间：2018-01-07 17:21

本文关键词：应用于ETC系统的吸波材料研究　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：Electronic Toll Collection(ETC)是智能交通系统的重要应用,使车辆可以以正常行驶速度通过收费广场以及自动收费站,短程通信可以通过工作在5.8GHz频率的专用短程通信(DSRC)系统完成,但是,来自人行道等其他设施的多重反射和非镜面散射的电磁波将引起特定区域之外所不需要的通信从而形成干扰,对此,吸波材料是解决上述问题的有效方案。本文依据吸波材料设计理论通过实验,制备了使用磁性材料与介电材料复合的吸波材料,分析了其电磁参数的变化规律以及材料厚度等因素对材料吸波性能的影响,在主配方基础上对材料的性能进行了多种优化尝试,并在传统材料设计基础上与超材料吸波器进行了复合,通过仿真研究了复合吸波器的特性。本文在前人基础上采用了磁性材料与介电材料复合的设计方法选取羰基铁粉分别与二氧化钛和钛酸钡复合,制备了在ETC系统工作频段有优良性能的吸波材料,实验发现,当复合材料中羰基铁粉的质量占比增加时,材料对电磁波损耗峰值向低频移动,当羰基铁粉复合占比为百分之七十左右时,最适合本文的研究范围;材料样品的厚度同样对匹配频点有影响作用,损耗峰值会随厚度的减小向高频移动;将羰基铁粉颗粒做扁平化处理可以使损耗移向低频,利用此规律可以有效减小材料的厚度,降低生产成本。本文将制备的传统吸波材料与超材料吸波器做了简单的复合,尝试研究新的性能,对于方块形超材料结构,复合吸波器可以产生带宽很宽的损耗,而对于花瓣形超材料结构,在仿真频段内出现了两个超强的吸收峰,有效带宽接近3GHz,这些新特性的出现可以为复合吸波材料器的优化与功能拓展奠定基础。
[Abstract]:Electronic Toll Collection (ETC) is an important application of the intelligent transportation system, the vehicle in normal driving speed through the toll plaza and automatic toll station, short-range communication through dedicated short-range communication work in the 5.8GHz frequency (DSRC) system, but communication electromagnetic waves reflected from multiple sidewalks and other facilities and non mirror scattering results in a specific area should not need to interfere in this regard, absorbing material is an effective solution to the above problems. On the basis of absorbing wave material by experiment design theory, prepared using absorbing composite magnetic materials and dielectric materials, changes of the electromagnetic parameters and analysis the thickness of the material and other factors on the absorbing property of the material, the main formula based on the performance of the material of a variety of optimization attempts, and based on the traditional design and materials The metamaterial absorber of the composite is studied by simulation of composite wave absorption characteristics. In this paper the design method of composite magnetic materials and dielectric materials selection of carbonyl iron powder composite and titanium dioxide and barium titanate were prepared, absorbing material, has excellent performance in the ETC system working frequency the experiment found that when the quality of carbonyl iron powder in the composite ratio increases, the electromagnetic waves loss peak shifts to lower frequency when the carbonyl iron composite accounted for about seventy percent of the time, the scope of the study the most suitable for the materials; sample thickness also has effect on the matching frequency, loss peak with thickness the move to high frequency will decrease; carbonyl iron particles do flattening process can make the loss moves to low frequency, effectively reduces the thickness of the material can use this law, reduce the production cost. This paper will be prepared by the traditional Wave absorbing material and metamaterial absorber made a simple composite, try to study the new properties for the box shaped metamaterial structure, loss of composite absorber can produce a very wide bandwidth, while for the petal shaped metamaterial structure, there are two strong absorption peaks in the frequency range of the simulation, the effective bandwidth approach 3GHz, these new features can be optimized and wave absorbing composite materials for the function of.

【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U495;TB34

【相似文献】