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A novel numerical approach for the analysis of the near field of a moving body for the mobile communication systems

一种用于分析移动通信系统移动体近场的新颖数值方法

基本信息

批准号：
13650435
负责人：
KURODA Michiko
金额：
$ 0.7万
依托单位：
Tokyo University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650435/
关键词：
body fitted grid generation with moving boundary moving boundary FD-TD method scattering grid generation MEMS FD・TD法

项目摘要

As there has been rapid increase in a mobile communication systems, it becomes important to evaluate the effect of the near field of the moving body. It is also very important to evaluate the field distribution by the movement of the body. Recently, as the wireless LAN becomes popular, it is necessary to know the interaction between the antenna and the moving body. The radiation pattern and the characteristics are altered by the presence of the moving body. To clarify the propagation characteristics in the wireless LAN, the author examined the influence the antenna and the moving body analytically. To solve these problems numerically, the author has proposed a novel numerical procedure of grid generation having coordinate line coincident with an arbitrarily shaped moving boundary. By using the presented transformation technique, partial differential equations can be solved very easily in the fixed rectangular coordinate system. Finally, we can solve the moving problem in a fixed rectangular coordinate system. Some numerical results are compared with the experimental ones and excellent agreement between them are obtained. And also this technique was applied for the analysis of MEMS-based variable devices with moving parts. Using this new technique, a variable capacitor that consists of two moving plates is analyzed. The numerical results between the velocity and the capacitance are shown and the transient effect is accurately modeled. Those results were published in Electromagnetic Waves and Electronic Systems (EW&ES) in 2000, Telecommunications and Radio Engineering in 2002, IEEJ Trans, in 2003. And they were also presented in ACES2001, ACES2002, ACES2003, APMC2002, PIER2001, PIERS20002, APS/URSI2002, FESS-MMNA02.

随着移动的通信系统的快速增长，评估移动体的近场效应变得重要。通过物体的运动来评估场的分布也是非常重要的。近来，随着无线LAN变得流行，有必要知道天线和移动体之间的相互作用。辐射图和特性会因运动物体的存在而改变。为了阐明无线局域网中的传播特性，作者分析了天线和移动物体的影响。为了解决这些问题，作者提出了一种新的数值方法，即在任意形状的动边界上生成坐标线重合的网格。利用所提出的变换技术，可以在固定的直角坐标系中很容易地求解偏微分方程。最后，我们可以在一个固定的直角坐标系中解决运动问题。一些数值计算结果与实验结果进行了比较，并得到了很好的一致性。并将该方法应用于MEMS可变器件的运动分析。利用这种新技术，分析了由两个移动板组成的可变电容器。给出了速度和电容之间的数值结果，并对瞬态效应进行了精确建模。这些结果发表在2000年的《电磁波与电子系统》（EW&ES）、2002年的《电信与无线电工程》、2003年的《IEEJ Trans》上。ACES 2001、ACES 2002、ACES 2003、APMC 2002、PIER 2001、PIERS 20002、APS/URSI 2002、FESS-MMNA 02等国际学术期刊也发表了相关论文。