The Effect of Mutual Inductance and Mutual Capacitance on the Transient Response of Braided-Shield Coaxial Cables

Applications of Multiconductor Transmission Line Theory to the Prediction of Cable Coupling. Volume 8. Prediction of Crosstalk Involving Braided-Shield Cables

“…There has been an attempt to characterize the crosstalk from adjacent wire circuits via the transmission line model in [13]. However, the analysis assumes weak coupling between the two circuits; that is, theback interaction of the shield (pickup) circuit on the generating wire can be ignored.…”

“…Thus, for the purposes of the low-frequency model it is irrelevant which term is used in (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). We chose to use ZSH.…”

“…Thus, according to (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16), for the shield to reduce the inductive coupling to the shielded wire over the shielded section, it should be grounded at both ends and the frequency must be such that w S -7S.…”

“…Placing a shield around the receptor wire and grounding it at at least one end substantially reduces this capacitive coupling to the shielded wire over the shielded section. Thus for a single-end grounded shield and R = IkQ, the contribution to the total coupling over the shielded section reverts to a lower value which is essentially the inductive coupling to the shielded wire for the unshielded to unshielded case over this shielded section given by (4-la) with t substituted for S When both ends of the shield are grounded, the coupling over the shielded section falls to an even lower value of inductive coupling given by (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). For frequencies such that wk SS < ZSH' this inductive coupling over the shielded section becomes the same for the double-end grounded case and the single-end grounded cases as discussed above for the R = 500 termination.…”

“…Low-frequency models similar to those in Section III (but without pigtail considerations) were developed by Mohr [8,9]. More recently, work has been concentrated on modeling a single, braided-shield cable which is illuminated by an incident field [13][14][15][16][17][18][19]. These works stem from the interest in the vulnerability of the shielded cable (or, more importantly, the equipments at its terminals) to a nuclear electromagnetic pulse (NEMP), a lightning induced electromagnetic pulse (LEMP) or a high-power radar.…”