Vol. 105

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues
2010-06-03

Design of Band-Pass Filters Using Stepped Impedance Resonators with Floating Conductors

By Maria Velazquez-Ahumada, Jesus Martel-Villagran, Francisco Medina, and Francisco Mesa
Progress In Electromagnetics Research, Vol. 105, 31-48, 2010
doi:10.2528/PIER10042010

Abstract

A new type of miniaturized stepped impedance resonator (SIR) for bandpass filter applications is proposed in this paper. The new resonator incorporates a ground plane window with a floating conductor in the backside of the substrate. The ground plane window increase the characteristic impedance of the lines used to implement the inductive region of the quasi-lumped resonator, thus allowing some size reduction. Moreover, the presence of a floating conducting patch printed below the capacitive region of the resonator pushes up the first spurious band of the filter. A meaningful improvement of its out-of-band rejection level is then achieved. The coupling between adjacent resonators is also enhanced thus leading to wider achievable bandwidths. Some filter designs using the new resonator and other standard resonators are included for comparison purposes.

Citation


Maria Velazquez-Ahumada, Jesus Martel-Villagran, Francisco Medina, and Francisco Mesa, "Design of Band-Pass Filters Using Stepped Impedance Resonators with Floating Conductors," Progress In Electromagnetics Research, Vol. 105, 31-48, 2010.
doi:10.2528/PIER10042010
http://jpier.org/PIER/pier.php?paper=10042010

References


    1. Nedil, M., T. A. Denidni, A. Djaiz, and H. Boutayeb, "ULtra-wideband bandpass filters using multilayer slot coupled transitions," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 4, 501-516, 2008.
    doi:10.1163/156939308784150353

    2. Zhang, X.-C., J. Xu, and Z.-Y. Yu, "Design of quasi-elliptic bandpass filter based on slow-wave open-loop resonators," Journal of Electromagnetic Waves and Applications, Vol. 22, 1849-1856, 2008.
    doi:10.1163/156939308786375091

    3. Razalli, M. S., A. Ismail, M. A. Mahdi, and M. N. Hamidon, "Novel compact ``via-less" ultra wideband filter utilizing capacitive microstrip patch," Progress In Electromagnetics Research, Vol. 88, 91-104, 2008.
    doi:10.2528/PIER08102303

    4. AlHawari, A. R. H., A. Ismail, M. F. A. Rasid, R. S. A. R. Abdulah, B. K. Esfeh, and H. Adam, "Compact microstrip bandpass filter with sharp passband skirts using square spiral resonators and embedded resonators," Journal of Electromagnetic Waves and Applications, Vol. 23, 675-683, 2009.
    doi:10.1163/156939309788019895

    5. Yu, W.-H., J.-C. Mou, X. Li, and X. Lv, "A compact filter with sharp transition and wideband rejection using the novel defected ground structure," Journal of Electromagnetic Waves and Applications, Vol. 23, 329-340, 2009.
    doi:10.1163/156939309787604454

    6. Razalli, M. S., A. Ismail, M. A. Mahdi, and M. N. Hamidon, "Novel compact ``via-less" ultra wideband filter utilizing capacitive microstrip patch," Progress In Electromagnetics Research, Vol. 91, 213-227, 2009.
    doi:10.2528/PIER09020403

    7. Tao, Y., M. Tamura, and T. Itoh, "Compact hybrid resonator with series and shunt resonances used in miniaturized filters and balun filters," IEEE Trans. on Microwave Theory and Tech., Vol. 58, 390-402, 2010.

    8. Cohn, S. B., "Parallel-coupled transmission-line resonator filters," IRE Trans. on Microwave Theory and Tech., Vol. 6, 223-231, 1958.
    doi:10.1109/TMTT.1958.1124542

    9. Crystal, E. G. and S. Frankel, "Hairpin-line and hybrid hairpin-line/half-wave parallel-coupled-line filters," IEEE Trans. on Microwave Theory and Tech., Vol. 20, 719-728, 1972.
    doi:10.1109/TMTT.1972.1127860

    10. Hong, J. S. and M. J. Lancaster, "Couplings of microstrip square open loop resonators for cross-coupled planar microwave filters," IEEE Trans. on Microwave Theory and Tech., Vol. 44, 2099-2018, 1996.
    doi:10.1109/22.543968

    11. Sagawa, M., K. Takahashi, and M. Makimoto, "Miniaturized hairpin resonator filters and their application to receiver front-end MIC's," IEEE Trans. on Microwave Theory and Tech., Vol. 37, 1991-1997, 1989.
    doi:10.1109/22.44113

    12. Hong, J. S. and M. J. Lancaster, "Theory and experiment of novel microstrip slow-wave open-loop resonator filters," IEEE Trans. on Microwave Theory and Tech., Vol. 45, 2358-2365, 1997.
    doi:10.1109/22.643844

    13. Gu, J., F. Zhang, C. Wang, Z. Zhang, M. Qi, and X. Sun, Miniaturization and harmonic suppression open-loop resonator bandpass filter with capacitive terminations, IEEE Intnal. Microwave Symposium, San Francisco (CA, USA), 373-376, 2006.

    14. Packiaraj, D., M. Ramesh, and A. T. Kalghatgi, "Design of a trisection folded SIR filter," IEEE Microwave and Wireless Comp. Lett., Vol. 16, 317-319, 2006.
    doi:10.1109/LMWC.2006.873459

    15. Akkaraekthalin, P. and J. Jantree, "Microstrip slow-wave open-loop slow resonator filters with reduced size and improvedIn conclusion stopband characteristics," ETRI Journal, Vol. 28, 607-614, 2006.
    doi:10.4218/etrij.06.0106.0007

    16. Wang, Y. X., "Microstrip cross-coupled tri-section stepped-impedance bandpass filter with wide stop-band performance," Journal of Electromagnetic Waves and Applications, Vol. 23, 289-296, 2009.
    doi:10.1163/156939309787604391

    17. Wang, J. P., B. Z. Wang, Y. X. Wang, and Y. X. Guo, "Dual-band miceostrip stepped-impedance bandpass filter with defected ground structure," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 4, 463-470, 2008.
    doi:10.1163/156939308784150335

    18. Sheta, A. F., "A novel compact degenerate dual-mode square patch filter using cross H-shaped defected ground structure," Journal of Electromagnetic Waves and Applications, Vol. 22, 1913-1923, 2008.
    doi:10.1163/156939308787537928

    19. Guo, Y. C., L. H. Weng, and X. W. Shi, "An improved microstrip open-loop resonator bandpass filter with DGSS for WLAN applications," Journal of Electromagnetic Waves and Applications, Vol. 23, 463-472, 2009.
    doi:10.1163/156939309787612301

    20. Packiaraj, D., K. J. Vinoy, and A. T. Kalghatgi, "Analysis and design of two layered ultra wide band filter," Journal of Electromagnetic Waves and Applications, Vol. 23, 1235-1243, 2009.

    21. Quendo, C., E. Rius, C. Person, and M. Ney, "Integration of optimized low-pass filters in a bandpass filter for out-of-band improvement," IEEE Trans. on Microwave Theory and Tech., Vol. 49, 2376-2383, 2001.
    doi:10.1109/22.971624

    22. Sun, S. and L. Zhu, "Stopband-enhanced and size-miniaturized low-pass filters using high-impedance property of offset finite-ground microstrip line," IEEE Trans. on Microwave Theory and Tech., Vol. 53, 2844-2850, 2005.

    23. Velazquez-Ahumada, M. C., J. Martel, and F. Medina, "Design of compact low-pass elliptic filters using double-side MIC technology," IEEE Trans. on Microwave Theory and Tech., Vol. 55, 121-127, 2007.
    doi:10.1109/TMTT.2006.888578

    24. Zhang, W., L. Han, R. Ma, and J. Mao, "Multiharmonic supression band-pass filter for communication system," ETRI Journal, Vol. 29, 533-535, 2007.
    doi:10.4218/etrij.07.0207.0022

    25. Garcia, J., J. Bonache, I. Gil, F. Martn, M. C. Velazquez, and J. Martel, "Miniaturized microstrip and CPW filters using coupled metamaterial resonators," IEEE Trans. on Microwave Theory and Tech., Vol. 54, 2628-2635, 2006.
    doi:10.1109/TMTT.2006.872934

    26. Masot, F., F. Medina, and M. Horno, "Analysis and experimental validation of a type of three-microstrip directional coupler," IEEE Trans. on Microwave Theory and Tech., Vol. 42, 1624-1631, 1994.
    doi:10.1109/22.310555

    27. Velazquez-Ahumada, M. C., J. Martel, and F. Medina, "Parallel coupled microstrip filters with floating ground-plane conductor for spurious-band suppression," IEEE Trans. on Microwave Theory and Tech., Vol. 53, 1823-1828, 2005.
    doi:10.1109/TMTT.2005.847083

    28. Lee, S. Y. and C. M. Tsai, "New cross-coupled filter design using improved hairpin resonator," IEEE Trans. on Microwave Theory and Tech., Vol. 48, 2482-2490, 2000.

    29. Zhu, J. and Z. Feng, "Microstrip interdigital hairpin resonator with an optimal physical length," IEEE Microwave and Wireless Comp. Letters, Vol. 16, 672-674, 2006.
    doi:10.1109/LMWC.2006.885622

    30. Makimoto, M. and S. Yamashita, Microwave Resonators and Filters for Wireless Communication, Springer Series in Advanced Electromagnetics, New York, 2001.

    31. Lee, S.-Y., Optimum resonant conditions of stepped impedance resonators, European Microwave Conference, 2005.

    32. Martel, J. and F. Medina, "A suitable integral equation for the quasi-TEM analysis of hybrid strip/slot-like structures," IEEE Trans. on Microwave Theory and Tech., Vol. 49, 224-228, 2001.
    doi:10.1109/22.900016

    33. Hong, J. S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York, Wiley, 2001.