An Extended Asymptotic Model for Fast Evaluation of the Induced Current on Multiconductor Transmission Lines Excited by the High-Frequency Nonuniform Electromagnetic Field

The asymptotic model is applied to analyze the high-frequency electromagnetic coupling problem of the multiconductor transmission lines (MTLs). To efficiently calculate the current of MTLs in the nonuniform electromagnetic field, an extended asymptotic model combined with matrix pencil method (MPM) is proposed in this article. In the proposed method, the complicated electric field is analytically expressed using an MPM signal model first. Then, considering the basic theory of the moment of method (MOM), the previous solving process of the asymptotic model is optimized in this article to adapt to the requirements of multiple calculations. Finally, the asymptotic model is extended to calculate the current excited by the equivalent plane wave component of the signal model with a good efficiency and accuracy. Moreover, calculating the transient response by the inverse fast Fourier transform (IFFT), several numerical examples with typical nonuniform electromagnetic fields are presented to validate the reliability of the extended asymptotic model.