混响室内加载物损耗特性试验研究

Research on the characteristics of lossy objects in a reverberation chamber

为研究混响室加载效应,首先分析了混响室内各损耗途径,得出加载损耗是混响室测试过程中唯一人为可控的损耗路径。构建了常见的5种不同测试场景,利用时域法分别对这5种测试场景条件下的混响室品质因数进行测试并进行分析。结果表明,金属天线支架造成的加载效应最小,非金属天线支架会对混响室造成明显加载,降低混响室的品质因数,且随着非金属天线支架数量的增多,这种效应会愈发明显。此外,对加载物的平均吸收截面进行了研究,将混响室内所有加载物视为一个加载吸收截面,得到金属天线支架的吸收截面最小,非金属天线支架的加载吸收截面有明显增加。

Aiming at the loaded effect of reverberation chamber,the lossy approaches in cavity are analyzed,and it is concluded that the loaded lossy is the only controllable approach in the testing process.Then five test scenarios are constructed to estimate the quality factor of reverberation chamber by using the time domain method.The result shows that the lossy effect caused by metal antenna supports is the least,while the non-metallic antenna supports could significantly load the reverberation chamber and reduce the quality factor of reverberation chamber.With the increase of the number of non-metallic supports,the effects would become more obviously.In addition,the average absorption cross section of the load is also investigated,taking all the lossy objects in the reverberation chamber as one lossy absorption cross section.It is shown that the absorption cross section of the metal antenna support is the smallest,and the loading absorption cross section of the non-metal support is significantly increased.