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We demonstrate experimentally a mechanism of the soliton generation in nonlinear active metamaterials. Our meta-structure consists of a ring resonator formed by a microwave amplifier loaded with a left-handed transmission line. We demonstrate a variety of nonlinear effects not described by weakly nonlinear models, and study experimentally the system's spatiotemporal dynamics, including the generation of envelope solitons being realized only for the backward-wave regime. V C 2014 AIP Publishingdoi:10.1063/1.4866856 fatcat:4h2i3dg62ndxfj73ledhwnpksy