A Novel Design for a Dual-Band Negative Group Delay Circuit

作者：Choi Heungjae^*; Jeong Yongchae; Lim Jongsik; Eom Soon Young; Jung Young Bae

来源：IEEE Microwave and Wireless Components Letters, 2011, 21(1): 19-21.

DOI：10.1109/LMWC.2010.2089675

• Composite right/left handed (CRLH)
• dual-band
• negative group delay (NGD)
• wide-band code division multiple access (WCDMA)
• worldwide interoperability for microwave access (WiMAX)

In this letter, a novel design for a dual-band negative group delay circuit (NGDC) is proposed. Based on the topology of a single-band reflection type NGDC, composite right/left handed lambda/4 short stubs are employed to obtain a negative group delay (NGD) at two separate frequency bands simultaneously. 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 measurements performed for wide-band code division multiple access and worldwide interoperability for microwave access, an NGD of -3.0 +/- 0.4 ns and -3.1 +/- 0.5 ns are obtained at 2.12-2.16 GHz and 3.46-3.54 GHz, respectively.

• 出版日期2011-1