volume | PIER Journals

Abstract

A novel balanced bandpass reconfigurable microstrip filter is presented, where in differential mode, the filter operates in seven different bands, and each inductor LM represents a state of frequency. The common mode rejection ration (CMRR) is better than 30 dB for all the states. The central frequency of the filter is changed by liquid metal droplets flowing along a microfluidic channel placed at the middle of the inductors LM. For demonstration, a third-order filter is designed, simulated, and fabricated, operating in the S-band. Good agreement between simulation and measurement is presented.

1. Rais-Zadeh, M., J. T. Fox, D. D. Wentzloff, and Y. B. Gianchandani, "Reconfigurable radios: A possible solution to reduce entry costs in wireless phones," Proc. IEEE, Vol. 103, No. 3, 438-451, 2015.
doi:10.1109/JPROC.2015.2396903

2. Zhang, S. X., Z. H. Chen, and Q. X. Chu, "Compact tunable balanced bandpass filter with novel multi-mode resonator," IEEE Microw. Wirel. Components Lett., Vol. 27, No. 1, 43-45, 2017.
doi:10.1109/LMWC.2016.2629965

3. Deng, H. W., L. Sun, F. Liu, Y. F. Xue, and T. Xu, "Compact tunable balanced bandpass filter with constant bandwidth based on magnetically coupled resonators," IEEE Microw. Wirel. Components Lett., Vol. 29, No. 4, 264-266, 2019.
doi:10.1109/LMWC.2019.2902328

4. Rebeiz, G. M., K. Entesari, I. C. Reines, S.-J. Park, M. A. El-Tanani, A. Grichener, and A. R. Brown, "Tuning into RF MEMS," IEEE Microwave Magazine, Vol. 10, No. 6, 55-72, Oct. 2009.
doi:10.1109/MMM.2009.933592

5. Amir, S., M. Dousti, and K.Mafinezhad, "A novel analytical technique to design a tunable bandpass filter with constant bandwidth," International Journal of Electronics and Communications (AEU), Vol. 70, 1433-1442, 2016.

6. Dang, J. H., R. C. Gough, A. M. Morishita, A. T. Ohta, and W. A. Shiroma, "Liquid-metal-based reconfigurable components for RF front ends," IEEE Potentials, Vol. 34, No. 4, 24-30, 2015.
doi:10.1109/MPOT.2014.2360938

7. Liu, T., P. Sen, and C. J. Kim, "Characterization of nontoxic liquid-metal alloy galinstan for applications in microdevices," J. Microelectromechanical Syst., Vol. 21, No. 2, 443-450, 2012.
doi:10.1109/JMEMS.2011.2174421

8. Guo, S., B. J. Lei, W. Hu, W. A. Shiroma, and A. T. Ohta, "A tunable low-pass filter using a liquid-metal reconfigurable periodic defected ground structure," IEEE MTT-S Int. Microw. Symp. Dig., 1-3, 2012.

9. Mumcu, G., A. Dey, and T. Palomo, "Frequency-agile bandpass filters using liquid metal tunable broadside coupled split ring resonators," IEEE Microw. Wirel. Components Lett., Vol. 23, No. 4, 187-189, 2013.
doi:10.1109/LMWC.2013.2247750

10. Pourghorban Saghati, A., J. S. Batra, J. Kameoka, and K. Entesari, "A miniaturized microfluidically reconfigurable coplanar waveguide bandpass filter with maximum power handling of 10 Watts," IEEE Trans. Microw. Theory Tech., Vol. 63, No. 8, 2515-2525, 2015.
doi:10.1109/TMTT.2015.2446477

11. McClung, S. N., S. Saeedi, and H. H. Sigmarsson, "Band-reconfigurable filter with liquid metal actuation," IEEE Trans. Microw. Theory Tech., Vol. 66, No. 6, 3073-3080, 2018.
doi:10.1109/TMTT.2018.2823307

12. Park, E. and S. Lim, "Microfluidic dual-band bandpass filter," 2017 IEEE Asia Pacific Microwave Conference (APMC), 762-764, 2017.
doi:10.1109/APMC.2017.8251559

13. Kaur, T. K., L. Osorio, J. L. Olvera Cervantes, J. R. Reyes-Ayona, and A. Corona-Chavez, "Microfluidic reconfigurable filter based on ring resonators," Progress In Electromagnetics Research Letters, Vol. 79, 59-63, 2018.

14. Zhou, W. J. and J. X. Chen, "Novel microfluidically tunable bandpass filter with precisely-controlled passband frequency," Electron. Lett., Vol. 52, No. 14, 1235-1236, 2016.
doi:10.1049/el.2016.1298

15. Zhou, W. J., H. Tang, and J. X. Chen, "Novel microfluidically tunable differential dual-mode patch filter," IEEE Microw. Wirel. Components Lett., Vol. 27, No. 5, 461-463, 2017.
doi:10.1109/LMWC.2017.2690874

16. Arbelaez-Nieto, A., E. Cruz-Perez, J. L. Olvera-Cervantes, A. Corona-Chavez, and H. Lobato-Morales, "The perfect balanced — A design procedure for balanced bandpass filters [Applications Notes]," IEEE Microwave Magazine, Vol. 16, No. 10, 54-65, Nov. 2015.
doi:10.1109/MMM.2015.2465712

17. Arbelaez-Nieto, A., J. L. Olvera-Cervantes, C. E. Saavedra, and A. Corona-Chavez, "Balanced liquid metal reconfigurable microstrip filter," Journal of Electromagnetic Waves and Applications, Vol. 31, No. 14, 1453-1466, 2017.
doi:10.1080/09205071.2017.1351402

18. Pozar, D. M., Microwave Engineering, 4th Ed., Vol. I, John Wiley & Sons, Inc., New York, 2012.

19. Hong, J.-S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, John Wiley & Sons, Inc., New York, 2001.
doi:10.1002/0471221619

20. Wu, C. H., C. H. Wang, and C. H. Chen, "Novel balanced coupled-line bandpass filters with common-mode noise suppression," IEEE Trans. Microw. Theory Tech., Vol. 55, No. 2, 287-294, 2007.
doi:10.1109/TMTT.2006.889147

21. Struck, C. J., "Group delay," Comput. Sci. Commun. Dict., 697-697, 2000.

Dr. Miguel-Antonio Romero-Ramirez

Dr. Jose Luis Olvera Cervantes

Dr. Tejinder Kaur Kataria

Dr. Alonso Corona-Chavez