Naslov
Ultra-broadband Reconfigurable Metamaterial based on Non-Foster Elements

Autori
Hrabar Silvio

Izvornik
AFRL WP

Vrsta, podvrsta
Ostale vrste radova, ostalo

Godina
2014

Ključne riječi
metamaterial; non-Foster

Sažetak
In the last decade, metamaterials have brought a lot of excitement with new intriguing physical phenomena such as negative refraction, sub-wavelength propagation, and resolution-free imaging, just to mention a few. Unfortunately, the practical engineering applications are still very limited due to two basic problems: pronounced losses and narrow operating bandwidth. This inherent drawback of all known passive (meta)materials is caused by basic background physics rather than by used technology (although it is usually believed so). A very interesting idea that might work around these inherent limitations has been proposed recently. It is based on negative capacitors and negative inductors (so-called non-Foster elements) with ‘inverse’ dispersion that causes extremely broadband behavior. This talk presents recent experimental results that include dispersionless ultra-broadband ENZ and MNZ metamaterials with operating bandwidth of more than 9 octaves (1MHz to 700 MHz). This bandwidth is considerably wider than the bandwidth of all passive ENZ metamaterials available at present. In addition, the unit cell of such metamaterial is in-situ reconfigurable (by external DC control signal) and able to achieve either DPS-ENZ or DPS-MNZ behavior. Using this novel approach, the same unit cell could be inserted into various transmission-line-based structures and (depending on its configuration) enable different applications such as: cloaking, squint-free leaky-wave antennas, metasurfaces, and broadband phase shifters in antenna arrays

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA