Influence of transmission line on stability of networks containing ideal negative capacitors

Lončar, Josip; Muha, Damir; Hrabar, Silvio

doi:10.1109/aps.2015.7304422

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…1c. The analysis (similar to those reported in [7,8] shows that the presence of a transmission line always introduces real pole(s) associated with unbounded exponential DC signal growth (such a pole is denoted with a) in Fig. 2.…”

supporting

confidence: 69%

“…Although it is believed that the stability problems occur primarily due to technological issues (such as existence of parasitics), this is only partially true. The stability issue is inevitably connected to basic physical phenomena such as causality and dispersion, as shown in [3,[5][6][7][8]. A simple way of analyzing stability of non-Foster FP antenna is finding system poles of the equivalent circuit in Fig.…”

mentioning

confidence: 99%

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Broadband Fabry-Pérot antenna with non-Foster metasurface - how to test the basic idea?

Hrabai

Debogović

2015

2015 IEEE International Symposium on Antennas and Propagation &Amp; USNC/URSI National Radio Science Meeting

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supporting

confidence: 69%

mentioning

confidence: 99%

Broadband Fabry-Pérot antenna with non-Foster metasurface - how to test the basic idea?

Hrabai

Debogović

2015

2015 IEEE International Symposium on Antennas and Propagation &Amp; USNC/URSI National Radio Science Meeting

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“…Many authors pointed out the negative impact of transmission lines and transistor packages on Non-Foster circuits [33][34][35][36]. As Loncar et al have shown, transmission lines have an impact on both reactance and resistance.…”

Section: Negative Inductance Circuitsmentioning

confidence: 99%

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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