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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) λ/4 short stubs are employed as a dual-band resonator. A CRLH λ/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±0.4 ㎱ and ?3.1±0.5 ㎱ are obtained at 2.122.16 ㎓ and 3.463.54 ㎓, respectively.

Dual-Band Negative Group Delay Circuit Using λ/4 Composite Right/Left-Handed Short Stubs