Coupling Through Tortuous Path Narrow Slot Apertures into Complex Cavitivies Page: 5 of 38
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WVang. Harrington and Mautz considered not only transmission into. but al-
so scattering from. conducting bodies with arbitrary apertures . In this
work, they formulated the three-dimensional problem for arbitrarily shaped
bodies and apertures: however, only zero thickness slots were considered. In
addition, the interior region did not include inhomogeneous media since an
integral equation method was used.
In 1988 Taflove et al. applied a FDTD technique to the analysis of narrow
slots and lapped joints in a two-dimensional conducting screen . This paper
recognized the importance of narrow slot apertures, in particular the tortuous
paths associated with lapped joints.
Following the work of Merewether , Riley and Turner applied the FDTD
technique to the analysis of a cavity-backed aperture loaded by boxes and
terminated wires. Their hybrid thin slot algorithm  advances the earlier
work of Gilbert and Holland . Later in 1990, they incorporated the model
of Warne and Chen into an FDTD analysis of a narrow slot aperture having
depth and losses into a regularly shaped cavity [93.
The demand for solutions of aperture/cavity problems has brought progress
in numerical techniques and their application. Historically, finite-difference
techniques have received greater attention in electromagnetics; the use of the
finite-element method has been more recent. Subsequently, hybrid techniques
using boundary integral/modal expansion techniques, method of moments
(MOM)/finite-difference/time-domain methods as well as finite-element/boundary
integral formulations have become commonplace [103, (20]. Non-zero thick-
ness was incorporated by using finite-difference (FD) techniques or finite-
element methods (FEM) to solve the interior problem increasing the compu-
tational size of the problem considerably. In recent years, the finite-element
method has proven to be a useful EMC prediction tool [213, [223.
The research performed to date demonstrates the maturity of hybrid nu-
merical methods in electromagnetics. The only slot/cavity work that in-
corporated a practical slot model was the effort of Riley and Turner .
However, their finite-difference implementation was not conducive to curved
surfaces and neither included wall loss nor dielectric inhomogeneities. Thus,
another formulation and solution are required to include additional features
in the model of a real world system.
In this paper, we present a hybrid numerical technique which can be used
to calculate the amount of energy penetrating a system through a narrow
slot aperture with depth and, at the same time. to determine its disposi-
tion; that is, of the power available in an impinging wave, how much is lost
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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. (https://digital.library.unt.edu/ark:/67531/metadc794730/m1/5/: accessed July 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.