中文摘要：

为比较分析振动本征混响室与机械搅拌混响室的场均匀性性能,针对振动型本征混响室（VIRC）腔壁不断振动的特点,提出了一种振动型本征混响室的场均匀性建模与仿真方法。将腔壁振动等效为多个细小腔壁在振动方向上随机振动,并将一个腔壁振动的混响室离散化为多个固定外形的混响室,则计算全部固定外形混响室中工作区域的电场即可获得振动型本征混响室的场均匀性。由此建立了振动型本征混响室的矩量法数值模型,进行低频段（200～400 MHz）的场均匀性仿真,并采用电场分量柱状图与Rayleigh分布概率密度曲线一致性比较的方法论证了建模与仿真的有效性。然后在200～400 MHz范围内将振动型本征混响室与同体积同外形的机械搅拌混响室进行场均匀性仿真对比,发现前者比后者的场均匀性标准偏差低0.5 dB以上,从而证明了在同体积同外形腔室结构条件下,振动型本征混响室较机械搅拌混响室能更有效的改善混响室的低频段性能。

英文摘要：

To analyze the field uniformity of vibrating intrinsic reverberation chamber （VIRC） and compare it with me- chanical stirring reverberation chamber （MSRC）, we proposed a method of field uniformity simulation of VIRC according to VIRC＇s vibrating characteristics of its cavity walls. In this method, we used random vibration of multiple as the equiv- alent of the VIRC＇s walls vibration in the vibrating direction, and used multiple RCs with fixed shapes to discretize a RC with vibrating cavity walls. Then the field uniformity of V1RC could be obtained by calculating the electric field in the working area of all the fixed RCs. Using this method and the method of moments, we built a numerical model of VIRC and calculated its field uniformity from 200 MHz to 400 MHz. Comparison between the histogram of normalized electric field component at a point in the VIRC and the probability density curve of Rayleigh distribution proves the validity of the numerical model and simulation. The obtained field uniformity of VIRC was also compared to that of an MSRC （the two chambers have the same shape and volume） from 200 MHz to 400 MHz. It is found that the VIRC＇s standard devia- tion of field uniformity is 5 dB smaller than that of MSRC, which indicates that, with the same figuration, VIRC has better low frequency performance than MSRC.