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J Electromagn Eng Sci > Volume 15(2); 2015 > Article
Journal of Electromagnetic Engineering and Science 2015;15(2):76-81.
DOI: https://doi.org/10.5515/JKIEES.2015.15.2.76   
Negative Group Delay Circuit with Improved Signal Attenuation and Multiple Pole Characteristics
Girdhari Chaudhary, Junhyung Jeong, Phirun Kim, Yongchae Jeong
Division of Electronics and Information Engineering, IT Convergence Research Center, Chonbuk National University
Abstract
This paper presents a design of a transmission line negative group delay (NGD) circuit with multiple pole characteristics. By inserting an additional transmission line into a conventional NGD circuit, the proposed circuit provides further design parameters to obtain wideband group delay (GD) and to help reduce signal attenuation. As a result, the number of gain compensating amplifiers can be reduced, which can contribute to stable operation when integrated into RF systems. The multiple pole characteristics can provide wider NGD bandwidth and can be obtained by connecting resonators with slightly different center frequencies separated by quarter-wavelength transmission lines. For experimental validation, an NGD circuit with two poles GD characteristic is designed, simulated, and measured.
Key words: Distributed Transmission Line, Low Signal Attenuation, Multiple Pole, Negative Group Delay

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