Average transmission cross section of aperture arrays in electrically large complex enclosures

Analytical approximations for the average transmission cross sections of aperture arrays in thick conducting walls have been calculated, including square arrays of square apertures and rhombic arrays of hexagonal apertures. The equations can be used for estimating the shielding efficiency of practical conducting enclosure at high frequencies. The results are compared with numerical simulations. Some possible design guidelines based on the proposed equations are also discussed.