  In this paper, a statistical model for the coupling of electromagnetic
radiation into enclosures through apertures is presented. The model gives a
unified picture bridging deterministic theories of aperture radiation, and
statistical models necessary for capturing the properties of irregular shaped
enclosures. A Monte Carlo technique based on random matrix theory is used to
predict and study the power transmitted through the aperture into the
enclosure. Universal behavior of the net power entering the aperture is found.
Results are of interest for predicting the coupling of external radiation
through openings in irregular enclosures and reverberation chambers.
