Original scientific paper
https://doi.org/10.7305/automatika.53-1.115
Stability Analysis of Superluminal Metamaterial Transmission Line with Realistic Non-Foster Negative Capacitors
Silvio Hrabar
; Faculty of Electrical Engineering and Computing, University of Zagreb, Unska 3, HR-10000 Zagreb, Croatia
Damir Zidar
; Constulting Engineer, Zavrtnica 5, HR-10000 Zagreb, Croatia
Igor Krois
; Faculty of Electrical Engineering and Computing, University of Zagreb, Unska 3, HR-10000 Zagreb, Croatia
Abstract
Recently, it has been shown possible to go around basic dispersion energy constraints that limit bandwidth of every passive metamaterial and construct a broadband active Epsilon-Near-Zero superluminal transmission line. A basic building block of this unusual transmission line is an active ‘tank circuit’ that contains both conventional (positive) capacitor and non-Foster negative capacitor. Published theoretical studies revealed that such a ‘tank circuit’ is stable if an overall capacitance is positive. These studies assumed lossless host transmission line periodically loaded with ideal dispersionless negative capacitors. However, a possible influence of the imperfections of a realistic negative capacitor (its dispersion and loss/gain) on the stability has not been investigated so far. Here, stability analysis of realistic superluminal transmission line is performed in Laplace domain. The obtained results are in a good agreement with those obtained in recent experiments on active transmission line developed at University of Zagreb.
Keywords
Non-Foster Element; Negative Capacitor; Stability; Metamaterial; Superluminal Propagation
Hrčak ID:
81297
URI
Publication date:
18.4.2012.
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