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Unit cell geometry of the proposed absorber structure: (a) top view and (b) perspective view. The optimized physical dimensions are as follows: Lu = 8 mm, Lc = 6.8 mm, Ro = 3.3 mm, Ri = 2.4 mm, Rc = 2.05 mm, Wr = 0.9 mm, Wc = 2.9 mm, Gc = 0.3 mm, Rv = 0.2 mm, Go = 0.75 mm, Gv = 0.5 mm, and Hu = 0.35 mm .
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