Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Dual-Band Negative Group Delay Circuit Using λ/4 Composite Right/Left-Handed Short Stubs

  • Choi, Heung-Jae (Department of Electronics and Information Engineering, Chonbuk National University) ;
  • Mun, Tae-Su (Department of Electronics and Information Engineering, Chonbuk National University) ;
  • Jeong, Yong-Chae (Department of Electronics and Information Engineering, Chonbuk National University) ;
  • Lim, Jong-Sik (Department of Electrical and Communication Engineering, Soonchunhyang University) ;
  • Eom, Soon-Young (Antenna Technology Research Team, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Jung, Young-Bae (Division of Electric, Electronic and Control Engineering, Hanbat National University)
  • Received : 2010.12.16
  • Published : 2011.06.30
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Abstract

In this paper, a novel design for a dual-band negative group delay circuit (NGDC) is proposed. Composite right/left-handed (CRLH) ${\lambda}/4$ short stubs are employed as a dual-band resonator. A CRLH ${\lambda}/4$ short stub is composed of a typical transmission line element as the right-handed component and a high-pass lumped element section as the left-handed component. It is possible to simultaneously obtain open impedances at two separate frequencies by the combination of distinctive phase responses of the right/left-handed components. Negative group delay (NGD) can be obtained at two frequencies by using dual-band characteristics of the CRLH stub. In order to achieve a bandwidth extension, the proposed structure consists of a two-stage dual-band NGDC with different center frequencies connected in a cascade. According to the experiment performed, with wide-band code division multiple access (WCDMA) and worldwide interoperability for microwave access (WiMAX), NGDs of $-3.0{\pm}0.4$ ns and $-3.1{\pm}0.5$ ns are obtained at 2.12~2.16 GHz and 3.46~3.54 GHz, respectively.

Keywords

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