HIRF penetration through apertures: FDTD versus measurements

The penetration of high-intensity radiated fields (HIRF) into conducting en closures via apertures is an EMI issue that is relevant to all aviation. Th e stories are numerous, of disrupted communications, disabled navigation eq uipment, etc., due to the effects of EM sources external to the aircraft. H ere, the FDTD method is used to predict the shielding effectiveness of cond ucting enclosures with apertures, and the numerical results are compared wi th measurements. Several issues related to the FDTD analysis of highly reso nant and high-quality factor (high-Q) structures, such as windowing and acc eleration techniques, are examined and discussed.