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This paper investigates the scattering characteristics of periodic open cabinets in nuclear power plants using the mode-matching technique. The concept of a parallel-plate waveguide is adopted, and the power conservations at all junctions are confirmed. The incident power is almost equivalent to the summations of the reflected and transmitted powers at all junctions, and the differences in the power for all cases are almost zero. A multiregion problem is systematically applied to resolve the entire scattered fields, and the resulting contour plots for the field strength according to various modal incidences are displayed. Based on this paper, modal field distributions for multilayer cabinet structures can be extensively analyzed. INDEX TERMS Electromagnetic compatibility, mode matching technique, multiregion problem. with The Ohio State University. Since 2016, he has been with Hongik University, where he is currently a Research Professor with the Metamaterial Electronic Device Research Center. His research interests include electromagnetic scattering through aperture, antenna design, and computational electromagnetics.

This paper conducts an electromagnetic analysis of the closed cabinet used for instrumentation and control in nuclear power plants for the case of a parasitic electric-line current that is undesirably generated onto an interior digital module. Based on the Helmholtz equation in conjunction with both the separation of variables and superposition principle, we employed a mode-matching method to obtain the analytic solution to an electromagnetic interference problem. Using modal coefficients from a set of simultaneous equations by enforcing boundary conditions, we computationally derive electromagnetic-field distributions in terms of various geometric parameters. The results provide us with information useful for estimating the level of influence of the undesired current source on the adjacent digital modules. INDEX TERMS Electric-line current, electromagnetic interference, mode-matching method.

The resonant microwave transmission characteristics of several coupled subwavelength ridged circular aperture arrangements in a thin metallic film are investigated using the three-dimensional finite-difference time-domain (3D FDTD) method. Simple equivalent circuits represented by the self and mutual conductances that have been quantitatively extracted for each resonance condition, including the mutual coupling effects, are also devised with the help of virtual magnetic current elements. Furthermore, a duality is identified between the ridged circular apertures and conventional half-wavelength dipole arrays based on comparing the respective resonance conditions.

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