Active Reconfigurable Metamaterial Unit Cell Based on Non-Foster Elements

Abstract : Most research in metamaterials (artificially enhanced materials which modify the permittivity and permeability of electromagnetic wave propagation in order to steer EM waves in novel ways) involve passive metamaterials in a negative (permittivity and permeability less than zero) or plasmalike (permittivity and permeability between 0 and 1) regime. Unfortunately, negative and plasmalike metamaterials exhibit high dispersion of EM energy at some wavelengths, thus giving them a very narrow operating bandwidth. This research builds on the investigators previous report showing that it is possible to overcome these dispersion-energy constraints by incorporating non-Foster elements (active electronic circuits employing positive feedback), with the most important goal of the project to develop an experimental demonstrator of a reconfigurable active metamaterial unit cell that can be either double-positive or epsilon (permittivity) near zero (DPS-ENZ) or either doublepositive or mu (permeability) near zero (DPS-MNZ), with other goals being the increase of operating frequency to microwave region, development of negative inductance for MNZ/MENZ metamaterials, tunable non-Foster cells, and interfacing cells with free space for scattering applications such as cloaking. The project succeeds in understanding negative capacitance and its role in metamaterials, investigates the basic physics of negative non-Foster tank circuits, designs, simulates, and builds prototypes of active ultra-broadband ENZ unit cells as well as prototypes of negative-inductor MNZ unit cells.

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