A time domain hybrid method for the coupling of two wires above the ground excited by electromagnetic pulses

Abstract

AbstractTo efficiently solve the coupling problems of two wires above the ground excited by incident electromagnetic pulses, a time domain hybrid method consisting of transmission line (TL) equations, finite difference time domain (FDTD) method, and a fast calculation approach to the excitation fields of the wires is presented. In this hybrid method, a novel coupling model of the two wires is established by the TL equations firstly, which is suitable for arbitrary heights of the two wires and for considering influences of the ground on distributed parameters of the two wires. Then, due to the obviously infinite dimension of the ground, a fast calculation approach is utilized to obtain the excitation fields of the wires to avoid modeling the ground directly. Finally, the FDTD method is adopted to discretize the TL equations to calculate the transient responses at the termination loads of the two wires. Numerical examples are given to demonstrate the accuracy and efficiency of this hybrid method. It shows that this method can tremendously decrease the memory requirement and computation time, compared with the full‐wave method. The applicability of this method in fast coupling analysis of long two wires with arbitrary heights above the ground excited by multiple electromagnetic pulses is verified.