扫频实现混响室频率搅拌的仿真和实验研究

频率搅拌混响室具有节省建造成本、提供更大的测试空间、减少测试时间等优点,尤其适用于小混响室,应用前景广阔。计算了给定工作频率下混响室的谐振模式,对频率搅拌的有效性进行理论分析。分别采用FEKO建模仿真和试验两种方式,测量工作区域8个顶点位置的场强值,运用IEC61000-4-21中关于场均匀性的评价标准对测量结果进行检验。结果表明场均匀性均符合标准要求,从而验证了频率搅拌混响室的有效性。在此基础上通过设置对比仿真,比较了中心工作频率在200 MHz,搅拌带宽分别为6 MHz、10 MHz、20 MHz时场均匀性的情况。结果表明随着带宽增大,场均匀性可以得到一定程度改善,但并不明显。

Emulational and Experimental Investigation of Frequency-Stirred Reverberation Chambers by Sweeping Singnals

Frequency stirred reverberation chamber has many advantages, like save construction costs, provide more test space and reduce test time, especially, it has broad application prospect for small reverberation chamber. In this paper, we calculated the Reverberation chamber resonant mode under the given operating frequency, and had theoretical analysis of the effectiveness of frequency stirring. We adopted FEKO modeling simulation and experiment, and measured field strength values of 8 vertex position in the work area, then tested the measurement results by using IEC61000-4-21 about field uniformity evaluation standard. The results show that field uniformity are in line with the requirements of the standard, which proves the effectiveness of frequency stirred reverberation chamber. On this basis, by setting the contrast, we compared the center operating frequency 200MHz, stirred bandwidth respectively for 6MHz, 10MHz, 20MHz field uniformity. The results show that as bandwidth increases, the field uniformity can be improved but not very significant.