Skip to the main content

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


Full text: english pdf 667 Kb

page 31-37

downloads: 1.085

cite


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

https://hrcak.srce.hr/81297

Publication date:

18.4.2012.

Article data in other languages: croatian

Visits: 2.389 *