izvorni znanstveni rad
Recently, it has been shown possible to construct an (almost) dispersionless active ENZ metamaterials and transmission lines based on non-Foster elements. These structures are inherently extremely broadband (several octaves) and they may support counter-intuitive superluminal phase and group velocities. However, causality is always preserved due to finite bandwidth of any realistic non-Foster element. Here, the measurements of broadband superluminal phase and group velocity of an active transmission line operating in lower RF regime (10 MHz – 40 MHz) are reported.
metamaterial; ENZ; MNZ; non-Foster element
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