混响室FDTD仿真中归一化场强的计算与实验验证

Calculation and Experimental Verification of Normalized Electric Field in Reverberation Chamber's FDTD Simulation

采用时域有限差分(FDTD)法对尺寸为10.5m×0.8m×4.3m的混响室进行了三维仿真计算,为实现仿真与实测结果关于归一化电场强度的直接对比,给出了仿真电场值的归一化计算方法,并做出实验验证.结果表明:所提出的处理方法是合理可靠的,归一化电场强度与激励源无关,是表征混响室自身谐振特性的参量,因此可用频域测试结果对时域仿真结果进行实验验证,这为基于时域宽频仿真的混响室优化设计提供了有益参考.

A reverberation chamber（RC） with the size of 10. 5 m× 0.8 m ×4. 3 m is simulated by the finite difference time domain（FDTD） method. In order to realize the direct comparison between simulated and measured normalized electric field strength,a reliable method is proposed for the normalization of simu- lated electric field with measurement verification. Through simulation and measurement, the normalized electric field strength is found to be a parameter embodying the RC＇s intrinsic resonant characteristics, which are independent of the driving source. Therefore, it is feasible to validate the time-domain simulation results by frequency-domain measurement. The optimum design of a RC based on time-domain simulation can draw a certain referential value from this conclusion.