摘要
讨论了多层平板屏效计算中的等效传输线法。定义了不同传输线间的反射系数与透射系数，求出了反射系数和透射系数的表达式。利用上述定义，很容易求出不同传输线组成的电路中各部分中的入射场与反射场的分布。在此基础上，求解了任意多层平板屏蔽体对正入射平面波的屏蔽系数和屏效，并就单层屏蔽体和双层屏蔽体的情况与已有的结论进行了对比和验证。和以往理论比较，计算公式简单明了，物理概念清晰。文中透射系数的定义是对传输线基本理论的有益补充。
In electromagnetic compatibility field, calculating the shielding effectiveness of shield body is a important subject. In order to calculate shielding effectiveness, the field distribution in shielding region should be determined. In general, it is very complicated to calculate field distribution utilizing field method. This paper presented the equivalent transmission line method for calculating the shielding effectiveness. The transmission coefficient between transmission lines with different characteristic impedance and propagation constant were defined. With this definition, this paper easily gave the field distribution in any shield body and solved the shielding effectiveness of multi layer plane shield for normally incident plane wave. Compared with previous theory, this paper gave simpler and clearer formulae.
出处
《电波科学学报》
EI
CSCD
1999年第4期384-389,共6页
Chinese Journal of Radio Science
基金
国家自然科学基金资助项目!(69671026)
关键词
电磁屏蔽
屏蔽效能
等效传输线法
传输线
Electromagnetic shielding
Shielding effectiveness
Equivalent transmission line method
