Vol. 71

Latest Volume
All Volumes
All Issues
2017-11-21

Design of Dual-Band Bandstop Filter Based on Dumbbell-Shaped Resonators and U-Shaped Slot

By Xue-Liang Min and Hou Zhang
Progress In Electromagnetics Research Letters, Vol. 71, 133-140, 2017
doi:10.2528/PIERL17091804

Abstract

A novel dual-band bandstop filter based on a square, symmetric dumbbell-shaped resonator and U-shaped slot defected ground structure is presented. First, the characteristic of the fundamental structure which adopts two dumbbell-shaped resonators and one U-shaped slot is analyzed. Simulated results demonstrate that the proposed structure induces two transmission zeros within 2-8 GHz. Then, the structure adopting four dumbbell-shaped resonators and one U-shaped slot is analyzed. Simulated results point out that the characteristic of dual stopbands is better than the fundamental structure. Based on above implementation, a dual-band bandstop filter based on eight proposed dumbbell-shaped resonators and two U-shaped slots is proposed and fabricated. Two center frequencies at 4 and 6.5 GHz are reported, corresponding to the attenuation levels of 41.9 and 26.1 dB. The return losses of center frequencies are 0.04 and 0.20 dB, respectively, and the dual stopband bandwidths with 10 dB signal attenuation are 690 MHz and 250 MHz. In addition, two transmission poles at each stopband are induced for better selectivity. Owing to the symmetric dumbbell shape, the size of the filter gets reduced. It is simple to design and quite compatible with planar construction fabrication.

Citation


Xue-Liang Min and Hou Zhang, "Design of Dual-Band Bandstop Filter Based on Dumbbell-Shaped Resonators and U-Shaped Slot," Progress In Electromagnetics Research Letters, Vol. 71, 133-140, 2017.
doi:10.2528/PIERL17091804
http://test.jpier.org/PIERL/pier.php?paper=17091804

References


    1. Pan, T., K. Song, and Y. Fan, "Compact dual-bandstop filter based on composite right/left handed transmission line," Microwave and Optical Technology Letters, Vol. 55, No. 5, May 2013.
    doi:10.1002/mop.27516

    2. Chin, K.-S., J.-H. Yeh, and S.-H. Chao, "Compact dual-band bandstop filters using stepped-impedance resonators," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 12, December 2007.
    doi:10.1109/LMWC.2007.910481

    3. Dhakal, R. and N.-Y. Kim, "A compact dual-band bandstop filter using a circular, folded, symmetric, meandered-line, stepped-impedance resonator," Microwave and Optical Technology Letters, Vol. 56, No. 10, October 2014.

    4. Zhang, C., J.-P. Geng, R.-H. Jin, X.-L. Liang, and L. Liu, "Dual-wideband bandstop filter using stepped impedance coupled-lines," Microwave and Optical Technology Letters, Vol. 57, No. 10, October 2015.

    5. Koirala, G. R., B. Shrestha, and N.-Y. Kim, "Compact dual-wideband bandstop filter using a stub-enclosedstepped-impedance resonator," International Journal of Electronics and Communications (AEU), Vol. 70, 198-203, 2016.
    doi:10.1016/j.aeue.2015.11.011

    6. Wang, W., M. Liao, Y. Wu, and Y. Liu, "Small-size high-selectivity bandstop filter with coupled-line stubs for dual-band applications," Electron. Lett., Vol. 50, 286-288, 2014.
    doi:10.1049/el.2013.3704

    7. Chu, Q.-X. and L.-L. Qiu, "Sharp-rejection dual-band bandstop filter based on signal interaction with three paths," Microwave and Optical Technology Letters, Vol. 57, No. 3, 657-660, 2015.
    doi:10.1002/mop.28923

    8. Ning, H., J. Wang, Q. Xiong, and L.-F. 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.
    doi:10.2528/PIER12072109

    9. Dhakal, R. and N. Y. Kim, "A compact symmetric microstrip filter based on a rectangular meandered-line stepped impedance resonator with a triple-band bandstop response ," Sci. World J., Vol. 2013, 2013.

    10. Jin, X. H., X. D. Huang, and C. H. Cheng, "Bandstop response of microstrip stepped impedance ring with rotational symmetry," Electron. Lett., Vol. 49, 121-123, 2013.
    doi:10.1049/el.2012.4151

    11. Bakhit, A. A. and P. W. Wong, "A novel single and dual-band miniaturized matched band-stop filter using stepped impedance resonator," Progress In Electromagnetics Research C, Vol. 33, 229-241, 2012.
    doi:10.2528/PIERC12091602

    12. VeIidi, 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, 2010.

    13. Mashhadi, M. and N. Komjani, "Design of dual-band bandpass filter with improved upper stopband using novel stepped-impedance resonator," Microwave and Optical Technology Letters, Vol. 56, No. 3, 603-606, 2014.
    doi:10.1002/mop.28151

    14. Sarkar, P., M. Pal, and R. Ghatak, "A compact dual stopband bandstop filter using defected SIR and Hilbert shape fractal structure," Microwave and Optical Technology Letters, Vol. 58, No. 6, 1345-1347, 2016.
    doi:10.1002/mop.29808

    15. Che, W., W. Feng, and K. Deng, "Microstrip dual-band bandstop filter of defected ground structure and stepped impedance resonators," International Journal of Electronics, Vol. 97, No. 11, 1351-1359, 2010.
    doi:10.1080/00207217.2010.488907

    16. Pramod, K., K. Jugul, and A. K. Shrivastav, "Formulation of size reduction technique in microstrip circuits by using DGS and DMS," Proceedings of the International Conference on Microwave, 861-864, 2008.

    17. Woo, D.-J., T.-K. Lee, J.-W. Lee, C. S. Pyo, and W. K. Choi, "Novel U-slot and V-slot DGSs for bandstop filter with improved Q factor," IEEE Trans. Microwave Theory Tech., Vol. 54, 2840-2847, 2006.

    18. Lee, S., S. Oh, W.-S. Yoon, and J. Lee, "A CPW bandstop filter using double hairpin-shaped defected ground structure with a high Q factor," Microwave and Optical Technology Letters, Vol. 58, No. 6, 1265-1268, 2016.
    doi:10.1002/mop.29791

    19. Woo, D.-J., T.-K. Lee, and J.-W. Lee, "An equivalent circuit model for a microstrip line with an asymmetric spiral-shaped defected ground structure," Microwave and Optical Technology Letters, Vol. 56, No. 5, 1222-1224, 2014.
    doi:10.1002/mop.28308