First ten years of active metamaterial structures with “negative” elements

Metamaterials'2017 – Metamaterials and Novel Wave Phenomena: Theory, Design and Application

Open Access

Fig. 6

The first non-Foster ENZ transmission line (1D non-Foster metamaterial) ([2,26,27]). (a) Basic block-diagram, (b) A photo of manufactured prototype, c) Measured effective permittivity, solid–real part, dashed − imaginary part, (d) Measured signal velocities, solid − group velocity, dashed- phase velocity.

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