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Feasibility of recently proposed leaky-wave antenna based on non-Foster-element-based transmission line is analyzed by full-wave numerical simulations. Analyzed structure comprises an ordinary microstrip line periodically loaded with non-Foster negative capacitors operating in RF frequency band. The parameters of negative capacitors were taken from the measurements on the prototypes developed in ultra-fast...
A classical superluminal propagation in systems with anomalous dispersion is compared with recently introduced superluminal propagation in non-Foster active epsilon-near-zero (or mu-near-zero) metamaterials. It is shown that the underlying physics of non-Foster superluminal propagation is fundamentally different from physics of anomalous dispersion. The non-Foster-based simultaneous superluminal phase...
The bandwidth of recently introduced transmission-line-based and inclusion-based non-Foster active ENZ metamaterials is studied numerically and experimentally. It is shown that the inclusion-based non-Foster metamaterials exhibit narrower operating bandwidth (up to two octaves) comparing to the transmission-line-based non-Foster metamaterials (more than four octaves). This difference occurs due to...
All known passive materials (or metamaterials) that have either negative (ENG, MNG) or less-than-unity (ENZ, MNZ) real parts of permittivity or permeability suffer from inherent narrow operating bandwidth caused by basic energy-dispersion constraints. Recently, it has been shown possible to go around these basic constrains by the use of so-called non-Foster elements (negative capacitors and negative...
Feasibility of recently proposed leaky-wave antenna based on non-Foster-element-based transmission line is analyzed by full-wave numerical simulations. Analyzed structure comprises an ordinary microstrip line periodically loaded with non-Foster negative capacitors operating in RF 100 MHz band. The parameters of negative capacitors were taken from the measurements on the prototypes developed in ultra-fast...
Recently introduced concept of active non-Foster metamaterial is reviewed with an emphasis on the counterintuitive background physics. The main fundamental and technological limitations such as stability and selection criteria for active elements are highlighted. It is shown that non-Foster-based active metamaterials are stable if equivalent permittivity or permeability is positive number. Since this...
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...
An active dispersionless ENZ metamaterial, based on periodic loading of a transmission line with non-Foster negative capacitors, has been introduced recently. Direct experimental determination of the equivalent permittivity of homogenized active transmission line might be difficult due to inherent instability of negative capacitors. It is also difficult to develop a realistic model of active negative...
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