多导体传输线高频场线耦合渐近法分析

基于理想地面上单导体传输线渐近法，提出了改进的多导体传输线渐近法。与已有多导体传输线渐近法相比，所提方法步骤简单，求解效率高。利用所提方法计算电磁波与不同结构多导体传输线网络之间的耦合，结果与全波分析方法计算结果吻合很好。在此基础上，分析了多导体传输线导线间距对沿线感应电流的影响。结果表明，随着导线间距变化，矩形网络和平行网络沿线感应电流波形变化趋势不同，且当间距大于一个波长后，平行网络和理想地面上相同结构的单导线具有相同的沿线感应电流。

Improved asymptotic method for high-frequency electromagnetic field coupling to multiconductor transmission line

Based on the asymptotic method for high frequency electromagnetic field coupling to single wire above the ground, an asymptotic method for multiconductor transmission line (TL) is proposed. The proposed method simplifies the solving process of the scattering/reflection parameters required and therefore becomes more efficient than the previous asymptotic method for multiconductor TL. The induced currents along multiconductor TLs with different configuration are calculated using the proposed method, and the results are in good agreements with the simulated results of NEC, a full-wave analysis software. Moreover, the influence of the separation distance between the wires of the rectangular TL and the parallel TL on the induced current is analyzed. Results show that the induced currents along these two TLs change in the rectangular TL and the parallel TL change in different way, as the separation distance between the lines increases. Especially, the induced current along the parallel TL no longer changes while the separation distance increases to more than a wavelength, and is the same as that along the single wire above the perfect conducting ground with the same structure.