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Active metamaterials embedded with nonlinear elements are able to exhibit strong nonlinearity in microwave regime.However, existing S-parameter based parameter retrieval approaches developed for linear metamaterials do not apply in nonlinear cases. In this paper, a retrieval algorithm of high-order susceptibilities for nonlinear metamaterials is derived.Experimental demonstration shows that, by measuring the power level of each harmonic while sweeping the incident power,high-order susceptibilities of a thin-layer nonlinear metamaterial can be effectively retrieved. The proposed approach can be widely used in the research of active metamaterials.
Active metamaterials embedded with nonlinear elements are able to exhibit strong nonlinearity in microwave regime. Yet, existing S-parameter based parameter prior to program development for linear metamaterials do not apply in nonlinear cases. In this paper, a retrieval algorithm of high-order susceptibilities for nonlinear metamaterials is derived.Experimental demonstration shows that by measuring the power level of each Harmonic while sweeping the incident power, high-order susceptibilities of a thin-layer nonlinear metamaterial can be retrieved. The proposed approach can widely used in the research of active metamaterials.