HIRF penetration and PED coupling analysis for fuselage models using a hybrid subgrid FDTD(2,2)/FDTD(2,4) method

Some of the problems associated with perfect electric conductor (PEC) boundary conditions in the context of FDTD(2,4) are discussed. Also, a hybrid technique of FDTD(2,4) with subgrid FDTD(2,2) is formulated and applied to practical engineering problems. FDTD(2,2) is the standard FDTD, second-order accurate both in time and space, whereas FDTD(2,4) is second-order accurate in time and fourth-order accurate in space. Two important EMI problems are examined. First, the shielding effectiveness of a simplified scale model of a Boeing 757 aircraft is calculated. A critical EMI/EMC issue, that is relevant to all aviation, concerns the penetration of high intensity radiated fields (HIRF) into conducting enclosures via apertures. Second, the coupling of personal electronic devices (PEDs) is examined for the scaled fuselage by modeling the coupling between a PED antenna inside the fuselage and an antenna mounted on the exterior skin of the fuselage. The EMI generated by PEDs is another very important issue for all aviation. In the two cases, both the standard and hybrid FDTD methods are applied and the predictions are validated by comparison with measurements.