| Dual-Band Negative Group Delay Circuit Using λ/4 Composite Right/Left-Handed Short Stubs |
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Heung-Jae Choi1, Tae-Su Mun1, Yong-Chae Jeong1, Jong-Sik Lim2, Soon-Young Eom3, Young-Bae Jung4 |
1Department of Electronics and Information Engineering, Chonbuk National University
2Department of Electrical and Communication Engineering, Soonchunhyang University
3Antenna Technology Research Team, Electronics and Telecommunications Research Institute (ETRI)
4Division of Electric, Electronic and Control Engineering, Hanbat National University |
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| Abstract |
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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. |
| Key words:
Composite Right/Left-Handed, Dual-Band, Negative Group Delay, WCDMA, WiMAX |
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