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，使用在5.8GHz的无线通信作为智能运输系统（ITS）的中央服务的非停止自动费用支付系统（称为电子收费（ETC））的扩散广泛，日本的扩散率已达到2008年的75％。在2008年，日本的扩散率在ETC的运行中启动了ETC的运行，由于无法进行的沟通造成的ETCEROMAGENTICERECTY OFFARES OFFARES OFFARE（EM）或其他gly（em）sovers equse eques em em em equse equsefe em em em等。波动吸收器的最佳用途是减轻此问题的可能方法，并且在各个地方使用了各种吸收器，例如用于Tollgate的天花板的板类型，Tollgate是一种用于路面的路面类型。在这样的背景下，还需要在ETC泳道之间安装的波吸收器，因为拥有两个或多个ETC车道的Tollgate数量可能会随着扩散速率上升而增加。 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定期，带有圆形晶格的磁性橡胶板。分析和实验评估各种特征。结果，对于使用ETC系统的圆形极化波，获得了反射损失和屏蔽效果的良好特征。因此，可以定量确认所提出的波吸收器的可行性。