兼并模对混响室场均匀性影响的仿真分析

为了研究兼并模对混响室场均匀性的影响,用FEKO软件建立了2个体积大致相等的矩形混响室壳体模型.1号混响室的尺寸为5 m×4 m×3 m,2号混响室尺寸为4 m×4 m×4 m,2号混响室存在简并模.2个混响室采用相同的机械搅拌器,分别计算2个混响室测试区某个矩形区域8个顶点的电场强度,计算各电场分量的以及总的标准偏差.结果表明,2号混响室场的标准偏差大于1号,说明兼并模的存在导致了混响室场均匀性的下降.

Simulation Analysis of an Effect on the Field Uniformity of a Reverberation Chamber Had by the Merger Modes

In order to study an effect on the field uniformity of a reverberation chamber had by the merger modes,two rectangular shell models of reverberation chamber whose volumes are approximately equivalent are established with the saft FEKO.The dimension of No.1 reverberation chamber is 5 m×4 m×3 m.The dimension of No.2 reverberation chamber is 4 m×4 m×4 m.There are merger modes in the No.2 reverberation chamber.The same mechanical stirrers are used by the two reverberation chambers.The electric field strength at the eight vertical points of a rectangular region in the test zone of the two reverberation chambers is calculated separately.The standard deviation of per electric field component and total electric field is calculated.The computed result indicates that the standard deviation of No.2 reverberation chamber is greater than that of No.1 reverberation chamber.This result indicates that the existence of the merger modes results in the decline of the field uniformity of the reverberation chamber.