Coupling Through Tortuous Path Narrow Slot Apertures into Complex Cavitivies Page: 4 of 38

1 Introduction
Electromagnetic coupling can adversely impact a multitude of applications
ranging from modern telecommunication systems to sophisticated electronic
warfare equipment. The primary coupling issues are electromagnetic compat-
ibility and interference, either intentional or unintentional. The functionality
of the systems involved, which typically consist of numerous subsystems op-
erating concurrently, can be characterized in terms of their susceptibility,
vulnerability and survivability in the electromagnetic environment in which
they are expected to operate.
To design effectively hardened, complex operational systems, it is critical
to characterize the worst case electromagnetic coupling, that is, the upper
bound of the field penetrating a system and the distribution of the energy
within that complicated system. System performance may be compromised
by a variety of penetration mechanisms. In this study, it is assumed that
the shield is constructed from good electrical conductors so diffusion can be
ignored and isolated so conductive effects are negligible. Back-door coupling
occurs through inadvertent cracks and gaps, created by warping or bowing,
at the mechanical interfaces between pieces of a shielded enclosure. These
back-door phenomena are much less predictable or controllable, and so merit
particular interest and study.
Coupling through unforeseen apertures such as the tortuous-path, lapped
seam depicted in Figure 1 into conducting cavities is the major thrust of this
work. To model realistic coupling problems, it is necessary to develop a model
which includes a three-dimensional representation of the slot/cavity config-
uration. Specifically. such a model should incorporate narrow slot apertures
having depth, loss and gaskets. backed by arbitrarily-shaped cavities, filled
with inhomogeneous, lossy dielectrics. The model should also incorporate
the effect of the finite conductivity of the enclosure walls.
The conceptual formulation for the cavity-backed aperture has been pre-
sented in detail by Harrington and Mautz [1] as well as Butler, Ramat-Samii
and Mittra [2]. The generalized network formulation presentation in the for-
mer is an extension of the work published by Harrington in a 1968 book [3].
In both papers, the problem is segmented into an interior and an exterior
region. Equivalent problems are formulated for the two regions and coupled
through the boundary conditions in the aperture. In these formulations, the
interior and exterior are generally considered to be homogeneous and. ex-
cept for the aperture. the regions are isolated by good electric conductors.


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Jedlicka, Russell P.; Castillo, Steven P. & Warne, Larry K. Coupling Through Tortuous Path Narrow Slot Apertures into Complex Cavitivies, article, July 26, 1999; Albuquerque, New Mexico. ( accessed July 16, 2019), University of North Texas Libraries, Digital Library,; crediting UNT Libraries Government Documents Department.

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