Circuit models of multiconductor shielded cables: incident plane wave effect

Abstract

Summary The present study examines the variation effects of incident plane wave on multiconductor shielded cables in frequency domains using Branin's method, which is referred to as the method of characteristics. The model operates in frequency and time domains with linear and nonlinear loads, respectively, which allows it to be easily introduced into circuit simulators, such as SPICE, Sabar, and ESACAP. Two examples are studied: coaxial shielded cables and shielded cables with two parallel wires (i.e., twinax cables), and they are both excited by an incident plane wave. The results obtained by this method are in agreement with those obtained by other methods. Copyright © 2015 John Wiley & Sons, Ltd.

Hybrid MoM-circuit models to analyze the radiated susceptibility of multiconductor shielded cables within complex structures

“…T I and T V are chosen in order to simultaneously diagonalize both L wr and C wr . From (6), the relation between the terminal mode voltages and currents for each cell can be written as follows [22]:…”

“…Z t = [Z t1 , Z t2 , …Z tN ] T represents the transfer impedance vector. For the braided shield, the transfer impedance is given by the following equation [22]:…”

“…3. Equivalent circuit of inner wires obtained from the method of characteristics (Branin's method) [18] as implemented in ESACAP [22]. R sh1 = 1 MΩ and R sh2 = 154.365Ω, while the inner terminations are matched: R w1 = R w2 = 50Ω.…”

“…Z t = [ Z t 1 , Z t 2 , … Z tN ] T represents the transfer impedance vector. For the braided shield, the transfer impedance is given by the following equation [22]:where Z dk and L tk represent the diffusion term and the inductance, respectively, which indicates the effect of the field penetrating through the braid apertures, respectively. The expression of these two parameters is derived from[21].…”

“…T I and T V are chosen in order to simultaneously diagonalize both L wr and C wr . From (6), the relation between the terminal mode voltages and currents for each cell can be written as follows [22]:where Z cm and γ m are the mode characteristic impedances and propagation constants, respectively. They are given by the following equations:…”