结构设计对混响室场性能影响的仿真研究

通过仿真计算，分别研究了尺寸比例设计对混响室场均匀性的影响和体积变化对混响室电场强度大小的影响。数据结果表明：混响室内工作区域的场均匀性随着混响室长／宽比值增大而变差，且为获得场均匀性较优的测试环境，长宽比例应〈2。同时证明了混响室存在一临界体积上限，小于临界体积上限时，随着体积的增大，室内的电场强度逐渐减小，场均匀性逐渐提高；达到临界体积上限后，室内的场均匀性开始变差，混响室逐渐丧失对电磁波的混响作用。通过仿真计算得出混响室模型临界体积上限为10^4m^3。

Numerical Simulation of Effects on Field Performance in Reverberation Chamber of Structure Design

In this paper,effects of dimensional proportion on field uniformity and effects of volume change on field strength are studied by numerical simulation technology. The results show that with increases in the ratio of long/width,field uniformity of the working volume descends. And in order to obtain better field uniformity,the ratio of long/width should be less than 2. Besides,that reverberation chamber has critical volume has been proved. When the chamber volume is lower than upper critical volume,the field strength descends with the volume of the chamber increasing, and field uniformity of the working volume increases. When the chamber volume is larger than upper critical volume, field uniformity of the working volume descends, and the chamber loses the reverberation effect on electromagnetic wave gradually. The upper critical volume of reverberation chamber calculated in this paper is 10^4m^3.