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 |
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Abstract |
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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