Performance Evaluation of Rectangular Enclosure for Any Arbitrary Polarization Angle

This paper intends to develop an analytical formulation for the shielding effectiveness of a rectangular enclosure with rectangular aperture having multiple holes of identical and distinct sizes with arbitrary polarization angle. A single mode normal incident transverse electric wave containing arbitrary polarization is decomposed into two orthogonal components in such a way that the electric field is situated perpendicular to both the length and the breadth sides of the aperture. Analysis of each individual component as per TE₁₀ mode is made by implementing Transmission Line Model and then combined to obtain the se. It is important to consider the mutual admittance between the aperture holes for accurate estimation of the SE. The formula under consideration is further extended to include the suitable admittance which takes the mutual intertwining between the aperture holes into account to signify the group of aperture holes. Simulation also has been performed to verify the SE of rectangular enclosure with identical and distinct sizes of aperture holes. It is evident from the simulation results that the SE is at its best when mutual admittance is considered and at the worst when mutual admittance is ignored. It can also be observed that the SE is comparatively more for aperture holes of identical size than aperture holes of distinct sizes.