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Figure 2: Unit cell designs of the omnidirectional metamaterial cloak. (a) Designed metamaterial cloak. (b) Unit cell and the corresponding effective constitutive parameters of the extreme metamaterial. Here, =15.0 mm, =16.0 mm, =5.0 mm, and the width of the slits is =0.25 mm. (c) Unit cell and the corresponding effective constitutive parameters of the non-extreme metamaterial. Here, = 6.0 mm, =2.35 mm, and =5.0 mm.