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The resonant microwave transmission characteristics of several coupled sub-wavelength 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 conductance's 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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