Radiated Immunity Test Involving Crosstalk and Enforcing Equivalence With Field-to-Wire Coupling

Relating Crosstalk to Plane-Wave Field-to-Wire Coupling

“…In this work, a novel formulation of crosstalk was proposed, which allowed verification of the idea that, as long as the weak-coupling assumption is satisfied, the previously identified [4] condition of matching of the generator circuit is not strictly necessary to assure negligibility of the perturbation this circuit exerts on the passive part of the receptor. On the basis of the obtained results, an equivalence scheme assuring equivalence between XT and FC in terms of voltages/currents induced at the receptor ends was formulated and validated by virtual experiments with reference to the RS test setup foreseen by aerospace Standards, [7], [8].…”

“…On the basis of the obtained results, an equivalence scheme assuring equivalence between XT and FC in terms of voltages/currents induced at the receptor ends was formulated and validated by virtual experiments with reference to the RS test setup foreseen by aerospace Standards, [7], [8]. With respect to the matched case [4], it was proven that the practically-relevant case of terminations of the generator circuit equal to 50 Ω (standard input impedance of RF generators) (a) provides comparable accuracy in the reconstruction of FC voltages/currents at the receptor-ends; and (b) offers advantages in terms of reduction of the forward power required for the test.…”

“…Based on this finding, a more general and feasible scheme of equivalence is proposed and validated by full-wave numerical simulation. The proposed results overcome previous attempts available in the literature, whose applicability was limited to specific incidence conditions of the EM field [5], [6], or by stringent requirements (i.e., conditions of matching) on the terminations of the circuit to be used in order to induce XT in the victim circuit, [4]. Also, it is shown that this new equivalence scheme offers advantages in terms of the forward power required to carry out the test.…”

“…Apart for specific incidence conditions [5], the use of two RF sources feeding the generator circuit from both terminations (as shown in Fig. 4) is in general required, [4]. Namely, in the presence of this new generator circuit (α = β), XT-induced sources V XT 0 , V XT L take the analytical expressions:…”

“…This work investigates this specific aspect by developing a novel frequency-domain formulation of XT, in which the effect of loading/perturbation exerted by the generator circuit on the harness under test (victim circuit) is rigorously pointed out by a suitable augmented circuit representation of the victim circuit. It is shown that if the two circuits are weakly coupled, the condition of matching at the terminations of the generator circuit, exploited in [4], can be relaxed, and negligibility of the loading effect onto the victim circuit can be achieved also for practical impedance values at the terminations of the generator circuit (e.g., 50 Ω impedances). Based on this finding, a more general and feasible scheme of equivalence is proposed and validated by full-wave numerical simulation.…”