摘要
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 plays an important role in the experimental validation of the time-domain simulation results of the reverberation chamber（RC）,and the quality factor is a key parameter embodying the RC＇s performance.In order to simplify the normalization computation of field strength and to make an appropriate estimation of the quality factor,the transmission line feed model for general wire antenna port was proposed.The model was verified by comparison of Sparameters,and then the quality factor formula regarding the normalized field strength was deduced based on the energy balance of a RC.The feed model was applied to the RC＇s numerical simulation by the finite-difference time-domain method with experimental validation carried out at several typical frequency points.Results show that the normalized field strength that approximates to the experimental results can be obtained by using this feed model and setting the air＇s electric conductivity to be 20μS/m,and that the computed quality factor exhibits an oscillation rising trend as the frequency increases.Consequently,a new way for both RC＇ s performance optimization and quality factor＇s numerical assessment is provided.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2012年第11期2906-2911,共6页
High Voltage Engineering
基金
国家自然科学基金青年基金(51107147)~~
关键词
混响室(RC)
时域有限差分(FDTD)法
传输线馈电
归一化场强
品质因数
S参数
reverberation chamber（RC）
finite-difference time-domain（FDTD）method
transmission line feed
normalized electric field strength
quality factor
Sparameter
