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Parameters of the SRR array and the spacer are the same as that in Fig. 1. (a) Front view of the structure, (b) geometry of cut-wire in the middle layer, (c) perspective view of the structure, (d) bottom metallic layer, and (e) right side of structure. Dimension (mm): p = 7.5, a = 5, w = 1.8, g = 1, l = 7, b = 3 and t = 2.
