Abstract
In this paper, a novel design for a dual-band negative group delay circuit (NGDC) is proposed. Composite right/left-handed (CRLH) <TEX>${\lambda}/4$</TEX> short stubs are employed as a dual-band resonator. A CRLH <TEX>${\lambda}/4$</TEX> 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 <TEX>$-3.0{\pm}0.4$</TEX> ns and <TEX>$-3.1{\pm}0.5$</TEX> ns are obtained at 2.12~2.16 GHz and 3.46~3.54 GHz, respectively.
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