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归一化场强是对混响室仿真结果进行实验验证的重要参量,而品质因数是表征混响室性能的关键指标。为了简化归一化场强的计算并实现对品质因数的合理评估,给出了适用于一般线天线端口的传输线式馈电模型,通过参数的对比验证了该馈电模型的正确性,并从混响室储能平衡角度,推导出品质因数关于归一化场强的关系式。采用该馈电模型,应用时域有限差分算法对实际混响室进行了数值仿真,并对几个代表性频点做了实验验证。结果表明:应用该馈电模型并将空气区域电导率设置为20μS/m,得到的归一化场强平均值逼近于实测结果,而品质因数随频率升高呈振荡上升的趋势。这为混响室的优化设计和品质因数的数值评估提供了新思路。
The normalized field strength is an important parameter for the experimental verification of the reverberation room simulation results. The quality factor is the key indicator of the performance of the reverberation chamber. In order to simplify the calculation of normalized field strength and achieve a reasonable evaluation of the quality factor, a transmission line feed model suitable for the general antenna port is given. The correctness of the feed model is verified by comparison of parameters. Reverberation room energy storage balance point, derived the quality factor of normalized field strength relationship. Using this feed model, the real-time reverberation chamber is numerically simulated by using finite-difference time-domain algorithm. Several representative frequency points are experimentally verified. The results show that the normalized field strength approximates to the measured result by applying this feed model and setting the air area conductivity to 20μS / m, while the quality factor tends to oscillate upward with increasing frequency. This provides a new idea for the optimization of the reverberation chamber and the numerical evaluation of the quality factor.