权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on Electromagnetic Radiation From Printed Circuit Board and Imaging of Its Radiation Sources

印刷电路板电磁辐射及其辐射源成像研究

基本信息

批准号：
13650395
负责人：
UNO Toru
金额：
$ 1.47万
依托单位：
Tokyo University of Agriculture and 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

项目摘要

The undesirable electromagnetic radiation occurs from a printed circuit board (PCB) or power lines which compose an electric equipments. One of the purposes of this study is to analyze the electromagnetic radiation from the PCB quite rigorously, and to estimate the position of the undesirable radiation. The PCB consists of the transmission line conductors, passive elements, active elements and so on. The electromagnetic radiation comes from the transmission lines mainly because the transmission line works as the antenna conductor. In order to estimate the undesirable radiation, the analysis in time domain would be very effective because the physical phenomena are able to catch easily. In this viewpoint, the Finite Difference Time Domain (FDTD) method is die most useful electromagnetic simulation method. The strength of the method is its simplicity and efficiency to model the electromagnetic field within a practical level of the accuracy. However, when one requires a quite accurate result, a great amount of computer resource is often required even if the geometry is relatively simple.This study proposes a technique for improving the accuracy of the FDTD method to analyze the planar structures printed on a dielectric substrate. The improvement is achieved by incorporating a quasi-static field behavior to the FDTD update equations The quasi-static field which is expressed as a closed form is obtained by a TEM approximation of a microstrip line. The modified FDTD algorithm is applied to the microstrip structures and the curved transmission line. It is confirmed numerically and experimentally that the proposed method is highly accurate and stable.On the other hand, the estimation of the undesirable radiation will be done near the PCB because of the dynamic range of the measurement equipment. In this study the MUSIC algorithm was modified to estimate the near field electromagnetic radiation sources. The effectiveness of this method is confirmed theoretically.

组成电气设备的印刷电路板（PCB）或电源线会产生不良电磁辐射。本研究的目的之一是对PCB的电磁辐射进行严格的分析，并估计不需要的辐射的位置。PCB板由传输线导体、无源元件、有源元件等组成，电磁辐射主要来自传输线，因为传输线起着天线导体的作用。为了估计不良辐射，时域分析将是非常有效的，因为物理现象可以很容易地捕捉。因此，时域有限差分法（FDTD）是目前最有效的电磁仿真方法。该方法的优点是它的简单性和效率，在实际的精度水平内模拟电磁场。然而，当一个需要一个相当准确的结果，大量的计算机资源往往是需要的，即使是相对简单的几何形状，本研究提出了一种技术，用于提高精度的FDTD方法来分析印刷在介质基板上的平面结构。改进是通过将准静态场行为纳入FDTD更新方程来实现的。准静态场通过微带线的TEM近似来获得，其被表示为封闭形式。将改进的FDTD算法应用于微带结构和弯曲传输线。数值计算和实验结果表明，该方法具有较高的精度和稳定性。另一方面，由于测量设备的动态范围较大，需要在PCB附近进行不良辐射的估计。本文对MUSIC算法进行了改进，使其能够用于近场电磁辐射源的估计。从理论上证实了该方法的有效性。