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A Shielding-Effectiveness Characterization for Highly Resonant Structures Applicable to System Design

Experimental measurements and computational predictions have been made of the transient interior coupling response of a simple 1-m-high cylindrical test object at Lawrence Livermore National Laboratory. The measurements were performed at the Transient Range Facility and the computations were made with the three-dimensional time-domain finite-difference code G3DXL3. Inside the test object, wires were run at different locations with a mix of short and open terminations. Cable currents at the base of the wires were measured for several geometries and compared with code predictions. This paper develops a method of characterizing and understanding the coupling process from a shielding-effectiveness (SE) standpoint that properly accounts for internal cavity responses. This method can be used to develop a large array of SE functions useful to system designers.