高频场线耦合分析方法比较

A comparative study of analysis methods for high-frequency field coupling to transmission lines

研究了基于广义传输线理论的迭代法、渐近法和基于经典传输线理论的辐射场叠加修正三种方法求解高频场线耦合问题的适用性.通过比较这三种方法应用于不同传输线结构的计算结果,并与全波分析软件NEC结果进行比较,发现基于广义传输线理论的方法在低频和高频时都可获得场线耦合问题的准确解,而经典传输线模型在高频时传输线近似条件得到破坏从而求解误差较大.此外,基于经典传输线理论的辐射场叠加修正方法用于高频时,计算结果相较于经典传输线理论得到很大改善.在此基础上,给出了三种高频场线耦合分析方法的适用条件和优缺点,并通过实验验证了计算结果的有效性.该研究对电磁兼容领域中场线耦合分析具有很好的参考意义.

The applicability of three methods, including iterative and asymptotic approaches based ongeneralized transmission line （TL） theory and modified classical TL method based on second radiation,for high frequency field coupling to TL is investigated. The induced current along transmission lineswith different structure exposed to high frequency plane wave is calculated using these methods and clas-sical TL theory respectively, and results are compared to full-wave analysis commercial software NECsolutions. All the results show that the methods based on generalized TL theory are applicable for bothlow and high frequency plane wave coupling to TL, while classical TL theory only is suitable for the cir-cumstances where TL approximations hold. However, modified classical TL theory may provide betterresults than classical TL theory when used at high frequency. Experimental results demonstrate the ef-fectiveness of approach based on generalized TL theory. Finally, the advantages and inapplicability ofthose methods are summarized.