Abstract
The influence of two short equivalent lines on the accuracy of the asymptotic method for electromagnetic field coupling to transmission line (TL) at high frequency is investigated. Firstly, the induced current distribution along the TL in terms of different lengths of two short lines is analyzed. It is indicated that the calculated induced current along the line by using asymptotic method is not reliable when any one of the short equivalent lines is half wavelength long. Secondly, the dependence of the two short equivalent lines on the TL length is studied. Results show that it is necessary to increase the suggested length of the equivalent short line L 1 =5h to at least L 1 =10h when the length of the TLs is much longer than the distance between two conductors (L≥100h), in order to get more accurate induced current along the line.
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