Figure 4

Metamaterial designs and retrieved permeability.

(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.