论文部分内容阅读
应用时域有限差分(FDTD)法对混响室进行时域建模仿真,结合快速Fourier变换(FFT)可得到混响室的宽频响应,但由于混响室本质上属于高品质因数(Q)的谐振腔体,仿真时往往遇到计算时间冗长的问题。为克服该问题,基于腔体储能衰减规律,推导出了混响室内电场强度衰减与Q值的关系式,实现了混响室损耗后处理方法。该方法可预估混响室时域仿真所需的时间步数,由一次无损耗仿真结果,可实现混响室在不同损耗程度下的数值模型快速计算。对实际混响室进行数值建模,模型计算结果与实测数据一致性较好,验证了提出方法的正确性。仿真发现:混响室的场均匀性随工作频率增大而变好,而当损耗程度大于实际情况时,场均匀性会出现一定恶化。该处理方法为混响室和其他电磁腔体的时域3维全波快速仿真提供了新思路,具有参考价值。
The time-domain modeling and simulation of the reverberation chamber are carried out by the FDTD method. The wideband response of the reverberation chamber can be obtained by combining with the fast Fourier transform (FFT). However, since the reverberation chamber is essentially a high quality factor (Q) Of the resonant cavity, the simulation often encounter the problem of lengthy calculation time. In order to overcome this problem, based on the attenuation law of cavity energy storage, the relation between the attenuation of electric field in reverberation chamber and the Q value is deduced, and the post-processing method of reverberation room loss is achieved. This method can predict the time steps required for the time domain simulation of the reverberation chamber. A non-destructive simulation result can be used to quickly calculate the reverberation chamber numerical model with different degrees of damage. The actual reverberation chamber is numerically modeled, and the calculated results are in good agreement with the measured data, which verifies the correctness of the proposed method. The simulation results show that the uniformity of the reverberation chamber becomes better with the increase of the operating frequency, and when the loss is greater than the actual situation, the uniformity of the field will be deteriorated to some extent. The processing method provides a new idea for the rapid simulation of time domain 3-D full-wave reverberation chambers and other electromagnetic cavities, and has reference value.