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. 2015 Aug 3;5:12764. doi: 10.1038/srep12764

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Copyright © 2015, Macmillan Publishers Limited

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(A) Simplified geometry illustrating one side of the metamaterial’s rotated-coil structure. U is the unit cell size, R is the spiral’s inner radius, W is the width of each turn and G is the gap between turns. The outer-most leg was widened to accommodate vias of radius 100 um. All dimensions are specified in the text. (B) The retrieved permeability of the single-layer LMNZ metamaterial exhibits at 13.56 MHz. (C) The retrieved permeability of the double-layer harmonic metamaterial exhibits both at 13.56 MHz and its first harmonic.

Inline graphic — (A) Simplified geometry illustrating one side of the metamaterial’s rotated-coil structure. U is the unit cell size, R is the spiral’s inner radius, W is the width of each turn and G is the gap between turns. The outer-most leg was widened to accommodate vias of radius 100 um. All dimensions are specified in the text. (B) The retrieved permeability of the single-layer LMNZ metamaterial exhibits at 13.56 MHz. (C) The retrieved permeability of the double-layer harmonic metamaterial exhibits both at 13.56 MHz and its first harmonic.