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Wave Absorber for Improving EM-Wave Environment between ETC Lanes and Its Practical Application

改善ETC车道间电磁波环境的吸波器及其实际应用

基本信息

批准号：
18560282
负责人：
HASHIMOTO Osamu
金额：
$ 1.98万
依托单位：
Aoyama Gakuin University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560282/
关键词：
Wave Absorber ETC Lane Rain Forced Plastic Magnetic Material Lattice Cylindrical Bars at Intervals Metal Mesh 円形格子円偏波 ETCレーン間磁性材

项目摘要

In recent years, the non stop automatic charge payment system using wireless communication at 5.8GHz as central service of intelligent transport systems (ITS), which is called electronic toll collection (ETC), is spread widely and diffusion rate has reached to 75% in Japan at 2008. When the operation of ETC was started, communication errors were caused in ETC environment due to undesired electromagnetic(EM)waves from walls, ETC gates or other possible nearby objects. The optimal use of wave absorber is a possible way to mitigate this problem, and a variety of absorbers are used in various places, such as a board type used for the ceiling of tollgate, a pavement type used for the road surface. In such a background, the wave absorber for installing between ETC lanes is also required because the number of tollgate, where two or more ETC lanes are possessed, may increase with diffusion rate rise. Certain performance is necessary for this absorber, such as absorption of undesired EM waves, shielding effect of EM wave reaching adjacent lanes, ventilation to avoid the shock of the wind, and visibility to adjacent lanes.In this research, some wave absorbers placed behind the metal mesh as back metal for improving ETC environment is proposed such as the type of reinforced plastic including glass fiber with periodic lattice, cylindrical bars with magnetic loss covers arranged periodically, and magnetic rubber sheet with circular lattice. Various characteristics are evaluated analytically and experimentally. As a result, good characteristics of reflection loss and shielding effect are obtained for circularly polarized wave using ETC system. Therefore, feasibility of proposed wave absorbers can be confirmed quantitatively.

近年来，以5.8 GHz无线通信为核心服务的智能交通系统(ITS)--电子收费(ETC)--不间断自动收费系统在日本得到了广泛的推广，2008年普及率已达75%。当ETC开始运行时，由于来自墙壁、ETC闸机或其他可能的附近物体的不需要的电磁波，导致ETC环境中的通信错误。优化使用吸波体是缓解这一问题的一种可能方法，各种吸波体被用于不同的地方，例如用于收费站天花板的板式吸波器，用于路面的人行道类型。在这样的背景下，还需要用于在ETC车道之间安装的吸波装置，因为拥有两个或更多ETC车道的收费口的数量可能随着扩散速率的增加而增加。这种吸波体需要一定的性能，如吸收不需要的电磁波，电磁波到达邻近车道的屏蔽作用，通风以避免风的冲击，以及对邻近车道的可见性。在本研究中，提出了一些放置在金属网后面的吸波体作为背金属，以改善ETC环境，如增强塑料的类型，包括周期性格子玻璃纤维，周期性排列的磁损耗盖圆柱杆，圆形格子磁性橡胶板。对各种特性进行了分析和实验评价。结果表明，采用ETC系统的圆偏振波具有良好的反射损耗特性和屏蔽效果。因此，可以定量地证实所提出的吸波材料的可行性。