Composite Metamaterial and Metasurface Integrated With Non-Foster Active Circuit Elements: A Bandwidth-Enhancement Investigation

Saadat, Soheil; Adnan, Muhammad; Mosallaei, Hossein; Afshari, Ehsan

doi:10.1109/tap.2012.2227654

Cited by 46 publications

(28 citation statements)

References 25 publications

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“…However, like all metamaterials, AMMs bandwidth is quite limited. In 2013, a collaboration from Northeastern and Cornell universities was the first to show that a NF negative inductor can significantly increase the operating bandwidth of an AMM [8].…”

Section: Non-foster Ammmentioning

confidence: 99%

“…Quickly, it was realized that these narrow bandwidths were inherently linked to the linear and passive, thus causal, nature of metamaterials [1][2][3]. Following this observation, several authors suggested to couple metamaterials with nonFoster circuits to overcome these limitations [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…On one hand, NF circuits have been successfully used to improve impedance matching of small antennas, by introducing a negative capacitance in the feeding network [13][14][15][16][17][18][19][20]. On the other hand, the number of NF circuits that demonstrated significant metamaterial bandwidth enhancement with a negative inductance is still very limited [20,21], despite many proposals [5][6][7][8]11]. This paper thus focuses only on negative inductance circuits among all nonFoster circuits.…”

Section: Introductionmentioning

confidence: 99%

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Negative inductance circuits for metamaterial bandwidth enhancement

et al. 2017

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Abstract. Passive metamaterials have yet to be translated into applications on a large scale due in large part to their limited bandwidth. To overcome this limitation many authors have suggested coupling metamaterials to non-Foster circuits. However, up to now, the number of convincing demonstrations based on non-Foster metamaterials has been very limited. This paper intends to clarify why progress has been so slow, i.e., the fundamental difficulty in making a truly broadband and efficient non-Foster metamaterial. To this end, we consider two families of metamaterials, namely Artificial Magnetic Media and Artificial Magnetic Conductors. In both cases, it turns out that bandwidth enhancement requires negative inductance with almost zero resistance. To estimate bandwidth enhancement with actual non-Foster circuits, we consider two classes of such circuits, namely Linvill and gyrator. The issue of stability being critical, both metamaterial families are studied with equivalent circuits that include advanced models of these non-Foster circuits. Conclusions are different for Artificial Magnetic Media coupled to Linvill circuits and Artificial Magnetic Conductors coupled to gyrator circuits. In the first case, requirements for bandwidth enhancement and stability are very hard to meet simultaneously whereas, in the second case, an adjustment of the transistor gain does significantly increase bandwidth.

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Section: Non-foster Ammmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Negative inductance circuits for metamaterial bandwidth enhancement

et al. 2017

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“…Nonlinear metamaterials, emphasizing the SRR type of elements, have been investigated extensively by Kivshar's University of Canberra team [129][130][131]. The SRR-type unit cells augmented with non-Foster elements also have been reported for other metamaterial-inspired structures by teams at Northeastern University [132] and Rome Tré [133]. By introducing non-Foster circuit elements into their metamaterialinspired antenna designs, the UAz team has overcome several basic physics bounds on small radiators to realize electrically small, efficient, broad impedance bandwidth and high directivity systems [134][135][136][137][138].…”

Section: Active and Extreme Contributionsmentioning

confidence: 99%

Metamaterials: The early years in the USA

Ziolkowski

2014

EPJ Appl. Metamat.

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-Metamaterials are artificial materials formed by embedding highly subwavelength inclusions in a host medium, which yield homogenized permittivity and permeability values. By design they offer the promise of exotic physics responses not generally available with naturally occurring materials, as well as the ability to tailor their properties to specific applications. The initial years of discovery emphasized confirming many of their exotic properties and exploring their actual potential for science and engineering applications. These seed efforts have born the sweet fruit enjoyed by the current generation of metamaterials scientists and engineers. This review will emphasize the initial investigative forays in the USA that supported and encouraged the development of the metamaterials era and the subsequent recognition that they do have significant advantages for practical applications.

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“…Non-Foster circuits can overcome the fundamental gain-bandwidth limitation as first described by Wheeler [1] and Chu [2], allowing for the development of applications in superluminal waveguides [3], broadband metamaterials [4], phase shifters [5] and antennas [6][7][8]. The non-Foster circuit can generate a "negative capacitor" or "negative inductor", thus to overcome the capacitance or inductance of the matching antenna.…”

Section: Introductionmentioning

confidence: 99%

Gain and Noise Performance of Non-Foster Matching Circuit for VLF Receiver Loop Antenna

Yan¹,

Liu²,

Dong³

et al. 2018

PIER M

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Abstract-Non-Foster matching circuits are those that can function as negative capacitors or inductors, and can thus overcome the gain-bandwidth limitation of passive matching circuits for antennas. This paper presents a non-Foster matching circuit (NFC) for a very low frequency (VLF) receiver loop antenna. The bandwidth of the antenna was improved by 383%, and the average gain was improved in most bands compared to a passive matching circuit (over 15-30 kHz). In contrast to circuits reported in other publications, the signal to noise ratio (SNR) of the passive matching network performed better than the non-Foster matching network. To analyze this phenomenon, a noise model was developed for the simplified balanced NFC, and noise analysis was conducted between the non-Foster and passive matching networks, which indicates that the non-Foster matching circuits cannot provide a better SNR performance than the passive matching circuits under low noise figure level receiver conditions.

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Composite Metamaterial and Metasurface Integrated With Non-Foster Active Circuit Elements: A Bandwidth-Enhancement Investigation

Cited by 46 publications

References 25 publications

Negative inductance circuits for metamaterial bandwidth enhancement

Negative inductance circuits for metamaterial bandwidth enhancement

Metamaterials: The early years in the USA

Gain and Noise Performance of Non-Foster Matching Circuit for VLF Receiver Loop Antenna

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