SciELO - Scientific Electronic Library Online

vol.10 número2Comparative study of fundamental properties of honey comb photonic crystal fiber at 1.55µm wavelengthHeuristic solutions related to challenges of optical burst switching paradigm índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados



Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Não possue artigos similaresSimilares em SciELO
  • Em processo de indexaçãoSimilares em Google


Journal of Microwaves, Optoelectronics and Electromagnetic Applications

versão On-line ISSN 2179-1074


RAVELO, Blaise  e  DE BLASI, Serge. An FET-based microwave active circuit with dual-band negative group delay. J. Microw. Optoelectron. Electromagn. Appl. [online]. 2011, vol.10, n.2, pp.355-366. ISSN 2179-1074.

Recent studies proved that certain electronic active circuits are capable to exhibit simultaneously a negative group delay (NGD) and amplification in microwave frequency bands. One of the simplest topologies generating this counterintuitive NGD function effect is formed by a series RLC-network in cascade with a transistor. By using this cell, similar to the classical electronic functions, dual-band NGD microwave devices with loss compensation possibility can be designed. Theoretic demonstrations concerning the theory of the NGD circuit considered are presented. The dual-band NGD concept feasibility is concretely illustrated by an example of EM/circuit co-simulations. So, in frequency domain, dual-band NGD with minimal values of about -1 ns was observed simultaneously within two frequency bands centered at about 1.05 GHz and 2.05 GHz. To highlight the functioning of the hybrid device considered, time-domain analysis showing the RF/microwave signal advancement is performed. As application, the concept investigated can be envisaged for data synchronization in multi-channel wireless communication systems eventually degraded by undesired EMI effects.

Palavras-chave : Dual-band device; microwave active circuit; negative group delay (NGD); signal synchronization.

        · texto em Inglês     · Inglês ( pdf epdf )


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons