Analysis of the terminal response characteristics of a single twisted-wire pair excited by HEMP

It is great harmful that High-altitude nuclear electromagnetic pulse (HEMP) can directly couple energy into the interior through apertures or wires. As the twist wire pair (TWP) is an important coupling way, studying the coupling of the twist wire pair excited by HEMP is very necessary in practice. The interference coupling response of the twist wire pair with the case that the incident wave is HEMP is computed by using an efficient matrix procedure based on the transmission line model (TLM). In this paper, closed-form analytic approximations of the terminal response valid for an arbitrary direction of incidence and polarization of the incoming plane-wave field are provided in the frequency. And the transient waveforms are computed by an inverse discrete Fourier transformation. Then this paper discusses what happens when a fraction of a turn is present at the end.