On the Response of a Terminated Twisted-Wire Cable Excited by a Plane-Wave Electromagnetic Field

Terminal Response of Twisted-Wire Pairs Excited by Nonuniform Electromagnetic Fields

“…The loads are denoted as Z 0 and Z L for future convenience. For its mathematical description, the standard bifilar-helix model is adopted [4][5][6][7]10]. The wires are taken to be perfectly conducting and electrically thin, so as to assume virtually filamentary currents.…”

“…However, as already pointed out, the application of full-wave numerical methods to this problem is a quite cumbersome task. As an alternative, transmission-line theory can be utilized as in [6,7], provided that certain restrictions are satisfied. The key point that gives this possibility is that: when the wire separation is sufficiently smaller than both the twist period and the wavelength of the excitation field (that is, b p and b λ), the per-unit-length inductance and capacitance of the line are nearly equal to those of an untwisted pair having the same b.…”

“…Common-mode line currents do not always contribute significantly to the terminal currents [11] and are beyond the scope of the present paper. The induced load voltages as obtained from the terminal differential-mode currents and the relevant end conditions [6,7] are given by…”

“…Nevertheless, the deployment of such methods in cases of twisted-wire structures is quite laborious and impractical. Alternatively, under certain restrictions often satisfied by actual twisted-wire lines, conventional transmission-line theory applies with a few modifications and leads to closed-form expressions for the terminal currents and voltages induced by arbitrary excitation fields [6,7]. The said expressions are given in the form of three-term integral formulas with integrands involving the electricfield components exciting the line.…”

Simple transmission line model suitable for the electromagnetic pulse coupling analysis of twisted-wire pairs above ground

“…In order to predict these coupling effects, a general procedure is to i) determine the distributed sources (generated by inductive or capacitive coupling) induced on a TL [2], ii) develop an equivalent TL model [3,4,5,6,7,8], and then iii) carry out the coupling analysis for each model. Especially, it is critical to develop an equivalent TL model to accurately represent the structural characteristics of the TL.…”