volume | PIER Journals

Abstract

This paper presents the design of a planar tunable Negative Group Delay (NGD) circuit with low reflections. A pulse-shaped stub inscription on the signal strip of a microstrip line generates a negative group delay, which can then be tuned to a desired value by varying the resistance inside the inscription. Poor reflection characteristics are inherent in such circuits, and a conventional solution like a simple impedance matching circuit compromises the overall NGD performance for a reduced reflection loss. Here, we have included a novel impedance-matching network loaded with absorptive elements at the input/output ports to avoid any reflections from the circuit, while maintaining its NGD behavior and compactness. The measured results validate the proposed design with -5 ns GD at 3 GHz with less than -10 dB reflection loss over the whole NGD bandwidth of 228 MHz at 3 GHz.

1. Su, Y., "Group delay variations in microwave filters and equalization methodologies,", Department of Microtechnology and Nanoscience, Master’s Thesis in Microtechnology and Nanoscience, 2012.
doi:10.1049/el:19930533 Google Scholar

2. Lucyszyn, S., I. D. Robertson, and A. H. Aghvami, "Negative group delay synthesizer," Electron. Lett., Vol. 29, 798-800, 1993.
doi:10.1109/LMWC.2007.910489 Google Scholar

3. Ravelo, B., A. Perennec, M. Le Roy, and Y. G. Boucher, "Active microwave circuit with negative group delay," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 12, 861-863, Dec. 2007. Google Scholar

4. Ravelo, B., A. Perennec, and M. Le Roy, "Broadband balun using active negative group delay circuit," Eur. Microwave Conf., 466-469, 2007.
doi:10.1002/mop.23883 Google Scholar

5. Ravelo, B., M. Le Roy, and A. Perennec, "Application of negative group delay active circuits to the design of broadband and constant phase shifters," Microw. Opt. Technol. Lett., Vol. 50, 3078-3080, 2008.
doi:10.1002/mmce.20482 Google Scholar

6. Ravelo, B., A. Perennec, and M. Le Roy, "Synthesis of frequency-independent phase shifters using negative group delay active circuit," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 21, No. 1, 17-24, Wiley, 2011.
doi:10.1109/MWSYM.2007.380286 Google Scholar

7. Noto, H., K. Yamauchi, M. Nakayama, and Y. Isota, "Negative group delay circuit for feed-forward amplifier," 2007 IEEE/MTT-S International Microwave Symposium, 1103-1106, 2007.
doi:10.23919/EUMC.2009.5296195 Google Scholar

8. Choi, H., Y. Kim, Y. Jeong, and C. D. Kim, "Synthesis of reflection type negative group delay circuit using transmission line resonator," 2009 European Microwave Conference (EuMC), 902-905, 2009.
doi:10.1109/APMC.2013.6695178 Google Scholar

9. Chaudhary, G., J. Jeong, P. Kim, Y. Jeong, and J. Lim, "Compact negative group delay circuit using defected ground structure," 2013 Asia-Pacific Microwave Conference Proceedings (APMC), 22-24, 2013. Google Scholar

10. Chaudhary, G., Y. Jeong, and J. Lim, "Miniaturized negative group delay circuit using defected microstrip structure and lumped elements," 2013 IEEE MTT-S International Microwave Symposium Digest (MTT), 1-3, 2013.
doi:10.2528/PIERM22072301 Google Scholar

11. Palson, C. L., R. K. Sreelal, D. D. Krishna, and B. R. Jose, "Frequency switchable and tunable negative group delay circuits based on defected microstrip structures," Progress In Electromagnetics Research M, Vol. 113, 23-33, 2022.
doi:10.1155/2014/836960 Google Scholar

12. Chaudhary, G., Y. Jeong, and J. Lim, "Realization of negative group delay network using defected microstrip structure," International Journal of Antennas and Propagation, Vol. 2014, 1-5, 2014.
doi:10.1109/TMTT.2013.2295555 Google Scholar

13. Chaudhary, G., Y. Jeong, and J. Lim, "Microstrip line negative group delay filters for microwave circuits," IEEE Transactions on Microwave Theory and Techniques, Vol. 62, 234-243, Feb. 2014.
doi:10.1109/LMWC.2018.2811254 Google Scholar

14. Wang, Z., Y. Cao, T. Shao, S. Fang, and Y. Liu, "A negative group delay microwave circuit based on signal interference techniques," IEEE Microwave and Wireless Components Letters, Vol. 28, No. 4, 290-292, Apr. 2018.
doi:10.1109/TCSII.2019.2955109 Google Scholar

15. Wan, F., N. Li, B. Ravelo, and J. Ge, "O=O shape low-loss negative group delay microstrip circuit," IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 67, No. 10, 1795-1799, Oct. 2020.
doi:10.1109/MDAT.2020.3002149 Google Scholar

16. Wan, F., N. Li, B. Ravelo, W. Rahajandraibe, and S. Lallechere, "Design of ``I" shape stub-based negative group delay circuit," IEEE Design & Test., Vol. 38, No. 2, 78-88, Apr. 2021.
doi:10.2528/PIERC20112201 Google Scholar

17. Meng, Y., Z. Wang, S.-J. Fang, and H. Liu, "A tri-band negative group delay circuit for multiband wireless applications," Progress In Electromagnetics Research C, Vol. 108, 159-169, 2021.
doi:10.1109/TCSII.2022.3192288 Google Scholar

18. Gu, T., J. Chen, B. Ravelo, F. Wan, V. Mordachev, and Q. Ji, "Quad-band NGD investigation on crossed resonator interconnect structure," IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 69, No. 12, 4789-4793, 2022.
doi:10.1088/1742-6596/1651/1/012104 Google Scholar

19. Lu, Q., X. Wu, and C. Wang, "Compact broadband absorptive bandstop filter based on microstrip," Journal of Physics: Conference Series, Vol. 1651, No. 1, 012104, 2020. Google Scholar

20. Xiao, J.-K. and Q.-F. Wang, "Individually controllable tri-band negative group delay circuit using defected microstrip structure," 2019 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC), 1-3, 2019.
doi:10.26866/jees.2020.20.1.73 Google Scholar

21. Girdhari, C. and J. Yongchae, "Reconfigurable negative group delay circuit with a low insertion loss using a coupled line," J. Electromagn. Eng. Sci., Vol. 20, No. 1, 73-79, 2020, https://www.jees.kr/journal/view.php?number=3374. Google Scholar

22. Macke, B., B. Segard, and F. Wielonsky, "Optimal superluminal systems," Phys. Rev. E, Vol. 72, 035601(R), 1-4, Sep. 2005.
doi:10.2528/PIERB21071209 Google Scholar

23. Kandic, M. and G. Bridges, "Negative group delay prototype filter based on cascaded second order stages implemented with Sallen-Key topology," Progress In Electromagnetics Research B, Vol. 94, 1-18, 2021. Google Scholar

Mrs. Chithra Liz Palson

Dr. Deepti Das Krishna

Dr. Babita Roslind Jose