Thin wire representation in novel computational methods

The methods derived from Maxwell´s equations can be applied to simulate very fast surge situation with specific geometry structure and compute its current distribution. The common methods are the finite difference time domain (FDTD) method, the method of moments (MoM) and so on. This paper shows a method of thin wire representation using the Antenna Design Framework Electromagnetic Satellite (ADF-EMS) software based on MoM method, which suits for the three-dimensional surge simulation. This software, as a standard numerical analysis tool on electromagnetic field around antennas and current distribution on the surface, can be applied to analyse the very fast surge phenomena. The geometry boundary problems can be solved with the electric-field integral equation, which reduces the complexity of modeling, numbers of segments and increases the accuracy. This paper indicates the basic theory of ADF-EMS and how to apply the software to solve time-domain problem with the methods of Fast Fourier Transform Algorithm (FFT) and Inverse Fast Fourier Transform (IFFT). Then the simulated in this paper and field results from literatures are compared to prove the availability of this method. These methods can be used to take a comprehensive consideration of electromagnetic field distribution and current distribution consisting of models of lightning channel, transmission tower and transmission line, which builds strong foundations for lightning current waveforms inversion calculation.