First Successful Demonstration of Volumetric non-Foster ENZ Metamaterial

Professor Hrabar  and his collaborators (Dr.sc. I. Krois and Ph.D. students I. Bonić, A. Kiričenko and D. Muha) designed and tested the first prototype of broadband volumetric ENZ non-Foster metamaterial operating in RF regime. The prototype comprises  a 2x2 array of short electric dipole loaded with negative capacitors. The measurements revealed relative effective permittivity of 0.67 +- 10%  within, the bandwidth 10 MHz-20 MHz   (one octave).  As far as our knowledge goes, this is the first experimental demonstration of stable volumetric ENZ non-Foster metamaterial.