基于能量守恒原理的嵌套混响室法材料屏蔽效能计算

发布时间：2018-03-08 06:27

本文选题：混响室　切入点：机械搅拌　出处：《高电压技术》2014年03期 　论文类型：期刊论文

【摘要】：基于归一化功率比(NPR)的屏蔽效能(SE)定义能够较好地解决混响室法材料SE测试中的部分问题,但现有NPR的推导过程忽略了多重耦合效应,导致获得的SE表达式仍不够准确。针对该问题,从能量守恒的角度出发,建立了测试场稳定后天线辐射功率等于系统损耗功率的方程,推导得到有无被测材料时透过测试窗口的NPR,最终给出一种改进的SE表达式。该方法物理意义清晰明确,修正了现有SE表达式因多重耦合效应而导致的计算偏差。对改进前后计算式的对比分析表明:随着测试窗口面积的增大与被测材料屏蔽能力的增强,现有表达式因多重耦合效应而导致的计算偏差可达十多dB。利用改进后的表达式处理实测数据能够更好地降低测试方法自身误差,合理评估材料的SE。
[Abstract]:The definition of shielding effectiveness based on normalized power ratio (NPR) can solve some problems in SE test of reverberation chamber materials, but the multi-coupling effect is neglected in the derivation of existing NPR. The obtained SE expression is still not accurate enough. In view of this problem, the equation of antenna radiation power equal to the system loss power after the stability of the test field is established from the point of view of energy conservation. The NPRs through the test window with or without the tested material are derived, and an improved SE expression is finally given. The physical meaning of the method is clear and clear. The calculation deviation caused by the multiple coupling effect of the existing SE expression is corrected. The comparison and analysis of the calculation formula before and after the improvement show that: with the increase of the test window area and the enhancement of the shielding ability of the tested materials, The calculation deviation of the existing expressions due to multiple coupling effect can reach more than 10 dB. Using the improved expression to deal with the measured data can better reduce the error of the test method itself and evaluate the SEE of the material reasonably.
【作者单位】：军械工程学院静电与电磁防护研究所;北京跟踪与通信技术研究所;
【基金】：国家自然科学基金(51107147;51177174)~~
【分类号】：TM937

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