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Microwave Negative Group Delay Circuit: Filter Synthesis Approach

Park, Junsik;Chaudhary, Girdhari;Jeong, Junhyung;Jeong, Yongchae

  • Received : 2015.09.25
  • Accepted : 2015.11.24
  • Published : 2016.01.31

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.

Keywords

Bandstop Filter;Frequency Transformation;Filter Approach;Low Pass Filter Prototype;Negative Group Delay

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  2. Subwavelength Metamaterial Unit Cell for Low-Frequency Electromagnetic Absorber Applications vol.8, pp.1, 2018, https://doi.org/10.1038/s41598-018-35267-w
  3. Design Method for Negative Group Delay Circuits Based on Relations among Signal Attenuation, Group Delay, and Bandwidth vol.19, pp.1, 2019, https://doi.org/10.26866/jees.2019.19.1.56

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)