volume | PIER Journals

Abstract

A novel miniaturized dual-band bandstop filter (DBBSF) is proposed by using the T-shaped defected microstrip structures (DMSs) and the U-shaped defected ground structures (DGSs) in this paper. The layout of the dual-band bandstop resonator (DBBSR) is presented at first. The dual stopbands of the DBBSR can be separately controlled since the mutual coupling of the defected structures is negligible. The working principles of the T-shaped DMS and U-shaped DGS are then provided and their design process is summarized. On the basis of the DBBSR, the design methodology of the compact DBBSF is proposed before its design procedures are presented. Following the design procedures, a second-order and third-order DBBSFs with Butterworth frequency response are designed, simulated and fabricated. The equivalent circuit models of the designed filters are also developed. Full-wave simulation results of the fabricated DBBSFs are in good agreement with the circuit simulation and measurement results, validating our proposed design methodology.

1. Moghadasi, S. M., A. R. Attari, and M. M. Mirsalehi, "Compact and wideband 1-D mushroom-like EBG filters," Progress In Electromagnetics Research, Vol. 83, 323-333, 2008.
doi:10.2528/PIER08050101

2. Wu, Y. and Y. Liu, "A coupled-line band-stop filter with three-section transmission-line stubs and wide upper pass-band performance," Progress In Electromagnetics Research, Vol. 119, 407-421, 2011.
doi:10.2528/PIER11072003

3. Cui, D., Y. Liu, Y. Wu, S. Li, and C. Yu, "A compact bandstop filter based on two meandered parallel-coupled lines," Progress In Electromagnetics Research, Vol. 121, 271-279, 2011.
doi:10.2528/PIER11061902

4. Xiang, Q.-Y., Q.-Y. Feng, and X.-G. Huang, "A novel microstrip bandstop filter and its application to reconfigurable filter," Journal of Electromagnetic Waves and Applications, Vol. 26, No. 8-9, 1039-1047, 2012.
doi:10.1080/09205071.2012.710365

5. Uchida, H., H. Kamino, K. Totani, N. Yoneda, M. Miyazaki, Y. Konishi, S. Makino, J. Hirokawa, and M. Ando, "Dual-band-rejection filter for distortion reduction in RF transmitters," IEEE Trans. Microwave Theory Tech., Vol. 52, No. 11, 2550-2556, 2004.
doi:10.1109/TMTT.2004.837161

6. Chin, K.-S., J. H. Yeh, and S. H. Chao, "Compact dual-band bandstop filters using stepped-impedance resonators," IEEE Microwave Wireless Comp. Lett., Vol. 17, No. 12, 849-851, 2007.
doi:10.1109/LMWC.2007.910481

7. Chin, K.-S. and C.-K. Lung, "Miniaturized microstrip dual-band bandstop filters using tri-section stepped-impedance resonators," Progress In Electromagnetics Research C, Vol. 10, 37-48, 2009.
doi:10.2528/PIERC09080306

8. Chiou, H.-K. and C.-F. Tai, "Dual-band microstrip bandstop filter using dual-mode loop resonator," Electron. Lett., Vol. 45, No. 10, 507-509, 2009.
doi:10.1049/el.2009.0235

9. Velidi, V. K. and S. Sanyal, "Compact planar dual-wideband bandstop filters with cross coupling and open-ended stepped impedance resonators," ETRI Journal, Vol. 32, No. 1, 148-150, 2010.
doi:10.4218/etrij.10.0209.0341

10. Cheng, D., H.-C. Yin, and H.-X. Zheng, "A compact dual-band bandstop filter with defected microstrip slot," Journal of Electromagnetic Waves and Applications, Vol. 26, No. 10, 1374-1380, 2012.
doi:10.1080/09205071.2012.700262

11. Vegesna, S. and M. Saed, "Microstrip dual-band bandpass and bandstop filters," Microw. Opt. Technol. Lett., Vol. 54, No. 1, 168-171, 2012.
doi:10.1002/mop.26469

12. Ning, H., J. Wang, Q. Xiong, and L. Mao, "Design of planar dual and triple narrow-band bandstop filters with independently controlled stopbands and improved spurious response," Progress In Electromagnetics Research, Vol. 131, 259-274, 2012.

13. Woo, D., T. Lee, J. Lee, C. Pyo, and W. Choi, "Novel U-slot and V-slot DGSs for bandstop filter with improved Q factor," IEEE Trans. Microwave Theory Tech., Vol. 54, No. 6, 2840-2847, 2006.
doi:10.1109/TMTT.2006.875450

14. Huang, S. Y. and Y. H. Lee, "A compact E-shaped patterned ground structure and its applications to tunable bandstop resonator," IEEE Trans. Microwave Theory Tech., Vol. 57, No. 3, 657-666, 2009.
doi:10.1109/TMTT.2009.2013313

15. Liu, J. X., W. Y. Yin, and S. L. He, "A new defected ground structure and its application for miniaturized switchable antenna," Progress In Electromagnetics Research, Vol. 107, 115-128, 2010.
doi:10.2528/PIER10050904

16. Barbarino, S. and F. Consoli, "UWB circular slot antenna provided with an inverted-L notch filter for the 5 GHz WLAN band," Progress In Electromagnetics Research, Vol. 104, 1-13, 2010.
doi:10.2528/PIER10040507

17. Wang, C. J. and T. H. Lin, "A multi-band meandered slotted-ground-plane resonator and its application of low-pass filter," Progress In Electromagnetics Research, Vol. 120, 249-262, 2011.

18. Xiang, Q.-Y., Q.-Y. Feng, and X.-G. Huang, "Bandstop filter based on complementary split ring resonators defected microstrip structure," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 13, 1895-1908, 2011.
doi:10.1163/156939311797453999

19. Gao, M.-J., L.-S. Wu, and J. F. Mao, "Compact notched ultra-wideband bandpass filter with improved out-of-band performance using quasi electromagnetic bandgap structure," Progress In Electromagnetics Research, Vol. 125, 137-150, 2012.

20. Wang, J., H. Ning, L. Mao, and M. Li, "Miniaturized dual-band bandstop filter using defected microstrip structure and defected ground structure," IEEE-MTT-S International Microw. Symp. Dig., 1-3, 2012.

21. Guha, D. and Y. M. M. Antar, Microstrip and Printed Antennas: New Trends, Techniques and Applications, John Wiley & Sons, New York, 2011.

22. Hong, J. S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, John Wiley & Sons, New York, 2001.

23. Gupta, K. C., R. Garg, I. Bahl, and P. Bhartia, Microstrip Lines and Slotlines, 2nd Edition, Artech House, Norwood, MA, 1996.

Dr. Jun Wang

Prof. Huansheng Ning

Dr. Qingxu Xiong

Professor Minquan Li

Dr. Ling-Feng Mao