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J Electromagn Eng Sci > Volume 16(1); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(1):7-12.
DOI: https://doi.org/10.5515/JKIEES.2016.16.1.7   
Microwave Negative Group Delay Circuit: Filter Synthesis Approach
Junsik Park, Girdhari Chaudhary, Junhyung Jeong, Yongchae Jeong
Division of Electronics and Information Engineering, IT Convergence Research Center, Chonbuk National University
Correspondence:  Yongchae Jeong,Email: ycjeong@jbnu.ac.kr
This paper presents the design of a negative group delay circuit (NGDC) using the filter synthesis approach. The proposed design method is based on a frequency transformation from a low-pass filter (LPF) to a bandstop filter (BSF). The predefined negative group delay (NGD) can be obtained by inserting resistors into resonators. To implement a circuit with a distributed transmission line, a circuit conversion technique is employed. Both theoretical and experimental results are provided for validating of the proposed approach. For NGD bandwidth and magnitude flatness enhancements, two second-order NGDCs with slightly different center frequencies are cascaded. In the experiment, group delay of $5.9{pm}0.5ns$ and insertion loss of $39.95{pm}0.5dB$ are obtained in the frequency range of 1.935-2.001 GHz.
Key words: Bandstop Filter, Frequency Transformation, Filter Approach, Low Pass Filter Prototype, Negative Group Delay
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