声学散射体对混波室场均匀性的影响  

Influence of Reverberation Chamber Field Uniformity Using Acoustic Diffusor

作　　者：何鹏[1] 蒋全兴[1] 周香[1] 赵才军[1] 邬昌峰[1] 

机构地区：[1]东南大学电磁兼容室,南京210096

出　　处：《微波学报》2009年第2期38-42,共5页Journal of Microwaves

基　　金：国家自然科学基金资助项目(50607001)

摘　　要：为了改善混波室低频时的性能,文中提出了基于声学理论的Schroeder散射体。通过FDTD数值仿真与实验相结合给出了不同频率散射体加入到装有搅拌器的混波室的前后场均匀性。分析了数值仿真与实验的结果,证明散射体能有效改善混波室中电场的均匀性尤其在较低频率下较为明显,拓展了给定混波室(由东南大学自主研发)最低使用频率(LUF)约100MHz,为改善混波室低频性能提供了思路。In order to improve the performance of the reverberation chamber in relative lower frequency, a type of Schroeder diffuser based on acoustic theory is designed and used. The field uniformity whether the diffusers added to the reverberation which equipped stirrers or not are measured and it is numerically simulated using finite-difference time-domain （FDTD） method for different frequency, respectively. The results of measurement and numerical simulation show that the diffuser improves field uniformity of lower frequency. The Sehroeder diffuser based on acoustic theory is proved to be an effective way to improve the performance of the reverberation chamber in low frequency and extend the lowest used frequency （LUF） of the reverberation chamber designed by Southeast University about 100MHz.

关 键 词：混波室 时域有限差分(FDTD) 散射体 场均匀性 

分 类 号：TN011[电子电信—物理电子学]