A fast and rigorous hybrid time-domain simulator for analyzing wave interactions with complex structures involving electrically large platforms along with cable-interconnected antennas, shielding enclosures, and printed circuit boards is described. To efficiently simulate such complex structures, three different solvers are hybridized: A TDIE-based field solver for computing external fields on platforms, antennas, enclosures, boards, and cable shields; a MNA-based circuit solver for computing currents and voltages on circuits; and a TDIE-based cable solver for computing guided fields along...