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The 2.5-dimensional closed loop is investigated to constitute a novel miniaturized frequency-selective surface (FSS) whose electric size of one unit cell is as small as $0.048\,{\lambda_0} \times 0.048\,{\lambda_0}$. For miniaturization, two pairs of orthogonal split square rings are connected in series by four vias array in the FSS unit cell. Thus, this FSS exhibits polarized insensitivity for different...
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