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Study on Achievement of a High-performance Test Room for Measuring Electromagnetic Disturbance

高性能电磁干扰测量试验室的成果研究

基本信息

批准号：
09450156
负责人：
TOKUDA Masamitsu
金额：
$ 10.3万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450156/
关键词：
Anechoic chamber Electromagnetic absorber Ferrite electromagnetic absorber Site attenuation Ray tracing method FDTD method Magnetic shield Super lattice ワイヤグリッド法磁性材料磁気シールドルーム

项目摘要

With the objective of achieving a high-performance test room for measuring electromagnetic disturbance, an electromagnetic anechoic chamber and a magnetic shield chamber are investigated.The results obtained are as follows :(1) Realization of High Performance Anechoic Chamber ; With the construction on an anechoic chamber which uses foamed ferrite as new absorbing material, it is confirmed that the absorber thickness can be decreased to lO cm, which is 1/10 that of the conventional absorber. This is the first in the world to realize a thickness of only lO cm in the frequency range of 30 MHz to 10 GHz.(2) Simulation of Electromagnetic Field for Anechoic Chamber ; We developed a calculation method of NSA (Normalized Site Attenuation) in the frequency range above 200 MHz by using ray tracing method and theoretically investigated methods of improving NSA of anechoic chamber using the same calculation method. For the frequency range below 200 MHz, we developed an NSA calculation method using FDTD (Finite Difference Time Domain) method.(3) Magnetic Material for Magnetic Shield Chamber ; We produced magnetic dielectric super lattices and- discovered that it is possible to control their electrical resistance while maintaining the magnetic properties. Furthermore, at extreme low temperatures, we discovered effects which are thought to be the result of a new phenomenon which increases permeability by more than a hundred times that of same-class conventional materials.

为了实现高性能的电磁干扰测试室，对电磁消声室和磁屏蔽室进行了研究。研究结果如下：(1)高性能消声室的实现；通过构建以泡沫铁氧体为新型吸波材料的消声室，证实了吸波器的厚度可以减小到10cm，是传统吸波器的1/10。这是世界上首次在30 MHz至10 GHz的频率范围内实现厚度仅为lO cm。(2)暗室电磁场仿真；采用射线追踪法建立了200 MHz以上频率范围内归一化站点衰减（NSA）的计算方法，并利用该计算方法对提高暗室NSA的方法进行了理论研究。对于200 MHz以下的频率范围，我们采用时域有限差分（FDTD）方法开发了一种NSA计算方法。(3)磁屏蔽室用磁性材料；我们制作了磁性介质超晶格，并发现在保持磁性质的同时控制其电阻是可能的。此外，在极低的温度下，我们发现了一种被认为是一种新现象的结果，这种现象使渗透率提高了一百倍以上，这是同类传统材料的结果。