Broadband superluminal effects in ENZ active metamaterial

• Published in: 2011 IEEE International Symposium on Antennas and Propagation (APSURSI) pp. 661 - 664
• Main Authors: Hrabar, S., Krois, I., Bonic, I., Kiricenko, A.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-07-2011
• Subjects: active metamaterial; Broadband communication; Capacitors; Dispersion; group velocity; Metamaterials; non-Foster; phase velocity; Power transmission lines; RLC circuits; superluminal; Transmission line measurements
• ISBN: 9781424495627; 1424495628
• ISSN: 1522-3965; 1947-1491
• DOI: 10.1109/APS.2011.5996798

Recently, it has been shown possible to construct an (almost) dispersionless active ENZ metamaterials and transmission lines based on non-Foster elements. These structures are inherently extremely broadband (several octaves) and they may support counter-intuitive superluminal phase and group velocities. However, causality is always preserved due to finite bandwidth of any realistic non-Foster element. Here, the measurements of broadband superluminal phase and group velocity of an active transmission line operating in lower RF regime (10 MHz - 40 MHz) are reported.