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(a) 3D illustration of the MA structure for one polarization (each unit cell is formed by the dual-layer square spiral metamaterial shown in Fig. 5a and a metal film is on the bottom).(b) Photograph of the fabricated sample. (c) the experimental reflection of the MA at 10°, 30°, 45° and 60° incidence angles. (d) the analytical, simulated and experimental angular absorptions of the MA at 1.74 GHz.
