Abstract
A periodic aperture array structure combined with a lossy ground conducting layer was analyzed using the method of moments and was shown to produce near-perfect absorption. Rectangular aperture and rectangular loop aperture geometries were considered as examples of a unit cell of aperture. The numerical results for the reflection coefficient for the case where the unit cell of the aperture was rectangular were compared with those obtained by using commercially available software, such as HFSS and CST MWS, to validate the analysis method. A method for solving the scattering problem using a planar lossy conductor was also considered. The accuracy of the solution provided by this method was better than or comparable to that of the commercially available software for an arbitrary thick conductor. In particular, the present structure composed of a combination of lossless FSS and lossy ground was observed to be useful in comparison with the previous structure composed of a combination of lossy FSS and perfect conducting ground from the view-point of the thickness minimization of the radar absorbing material in the case of a rectangular loop aperture. Notably, the present structure is the same as the basic architecture of photovoltaic devices.
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