Figure 1.

Concept of the nonlinear metamaterial (NLMM). a). Illustrative comparison of the linear metamaterial (LMM) and the NLMM. The LMM enhances the magnetic field during both the RF transmission and reception phases, while the NLMM remains silent during RF transmission and magnifies the magnetic field during RF reception. b) Schematic and e) theoretical oscillation amplitude of the linear metamaterial. c) Schematic and f) theoretical analysis results of the varactor-loaded spit ring resonator (VLSRR). d) Schematic of the nonlinear metamaterial consisting of a coupled liner helical array and VLSRR and g) its theoretical response when k = 0.2 and Δω = 0.3. h) - j) Calculated frequency response of the NLMM at different excitation strengths for varied conditions, e.g. k = 0.05, Δω = 0.3; k = 0.2, Δω = 0.3; and k = 0.2, Δω = 0; respectively.