volume | PIER Journals

Abstract

In this paper, a folded stepped impedance resonator (SIR), modified by adding an inner quasi-lumped SIR stub, is used as a basis block for a new implementation of dual-band bandpass filters. The main advantage of the proposed filter is to make it possible to independently control the electrical features of the first and second bands. The behavior of the first band basically depends on the geometry of the outer folded SIR. The second band, however, is strongly influenced by the presence of the inner stub. Additional design flexibility is achieved by allowing the inner stub to be located at an arbitrary position along the high impedance line section of the main SIR. The position of the tapped input and output lines can be optimized in order to reach a reasonable matching of the filter at the central frequencies of both passbands. Some designs are reported to illustrate the possibilities of the proposed structure. Experimental verification has been included.

1. He, Z. N., X. L. Wang, S. H. Han, T. Lin, and Z. Liu, "The synthesis and design for new classic dual-band waveguide band-stop filters," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 1, 119-130, 2008.
doi:10.1163/156939308783122689 Google Scholar

2. Dai, X.-W., C.-H. Liang, B.Wu, and J.-W. Fan, "Novel dual-band bandpass ¯lter design using microstrip open-loop resonators," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 2/3, 219-225, 2008.
doi:10.1163/156939308784160712 Google Scholar

3. Li, G., B. Wu, X.-W. Dai, and C.-H. Liang, "Design techniques for asymmetric dual-passband ¯lters," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 2/3, 375-383, 2008.
doi:10.1163/156939308784160785 Google Scholar

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

5. Dai, X.-W., C.-H. Liang, G. Li, and Z.-X. Chen, "Novel dualmode dual-band bandpass filter using microstrip meander-loop resonators," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 4, 573-580, 2008.
doi:10.1163/156939308784150326 Google Scholar

6. Hsu, C.-Y., H.-R. Chuang, and C.-Y. Chen, "Compact microstrip UWB dual-band bandpass with tunable rejection band," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 5/6, 617-626, 2009.
doi:10.1163/156939309788019741 Google Scholar

7. Abu-Hudrouss, A. M. and M. J. Lancaster, "Design of multiple-band microwave filters using cascaded filter elements ," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 10, 2109-2118, 2009.
doi:10.1163/156939309790109225 Google Scholar

8. Weng, R. M. and P. Y. Hsiao, "Double-layered quad-band bandpass filter for multi-band wireless systems," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 3, 2153-2161, 2009.
doi:10.1163/156939309790109324 Google Scholar

9. Alkanhal, M. A. S., "Dual-band bandpass filters using inverted stepped-impedance resonators," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 8/9, 1211-1220, 2009. Google Scholar

10. Myyake, H., S. Kitazawa, T. Ishizaki, T. Yamada, and Y. Nagatomi, "A miniaturized monolithic dual band filter using ceramic lamination technique for dual mode portable telephones ," IEEE-MTT-S International Microw. Symp. Dig , Vol. 2, 789-792, 1997. Google Scholar

11. Tsai, L. C. and C. W. Huse, "Dual-band bandpass filters using equal length coupled-serial-shunted lines and Z-transform techniques ," IEEE Trans. on Microwave Theory and Tech. , Vol. 52, No. 4, 1111-1117, Apr. 2004.
doi:10.1109/TMTT.2004.825680 Google Scholar

12. Chen, C. Y. and C. Y. Hsu, "A simple and effective method for microstrip dual band design," IEEE Microw. Wireless Compon. Lett., Vol. 16, No. 3, 246-258, May 2006.
doi:10.1109/LMWC.2006.873584 Google Scholar

13. Garcia-Lamperez, A. and M. Salazar-Palma, "Dual band filter with split-ring resonators," IEEE MTT-S International Microw. Symp. Dig., 519-522, 2006.
doi:10.1109/MWSYM.2006.249625 Google Scholar

14. Quendo, C., E. Rius, and C. Person, "An original topology of dualband filter with transmission zeros," IEEE-MTT-S International Microw. Symp. Dig., Vol. 2, 1093 -1096, 2003. Google Scholar

15. Tsai, C. M., H. M. Lee, and C. C. Tsai, "Planar filter design with fully controllable second passband," IEEE Trans. on Microwave Theory and Tech., Vol. 53, No. 11, 3429-3439, Nov. 2005.
doi:10.1109/TMTT.2005.855739 Google Scholar

16. Chin, K. S., J. H. Yeh, and S. H. Chao, "Compact dual-Band bandstop filters using stepped-impedance resonators," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 12, 849-851, Dec. 2007.
doi:10.1109/LMWC.2007.910481 Google Scholar

17. Kuo, J. T. and H. S. Cheng, "Design of quasi-elliptic function filters with a dual-passband response," IEEE Microw. Wireless Compon. Lett., Vol. 14, No. 10, 472-475, Oct. 2004.
doi:10.1109/LMWC.2004.834560 Google Scholar

18. Kuo, J. T., T. H. Yeh, and C. C. Yeh, "Design of microstrip bandpass filters with a dual-passband responds," IEEE Trans. on Microwave Theory and Tech., Vol. 53, No. 4, 1331-1337, Apr. 2005.
doi:10.1109/TMTT.2005.845765 Google Scholar

19. Sun, S. and L. Zhu, "Compact dualband microstrip bandpass filter without external feed," IEEE Microw. Wireless Compon. Lett., Vol. 15, No. 10, 644-646, Oct. 2005. Google Scholar

20. Zhang, Y. P. and M. Sun, "Dual-band microstrip passband filter using stepped-impedance resonators with new coupling scheme," IEEE Trans. on Microwave Theory and Tech., Vol. 54, No. 10, 3779-3785, Oct. 2006.
doi:10.1109/TMTT.2006.882895 Google Scholar

21. Weng, M. H., H. W. Wu, and Y. K. Su, "Compact and low loss dual-band bandpass filter using pseudo-interdigital stepped impedance resonators for WLANs," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 3, 187-189, Mar. 2007.
doi:10.1109/LMWC.2006.890463 Google Scholar

22. Velazquez-Ahumada, M. C., J. Martel, F. Medina, and F. Mesa, "Design of a dual band-pass filter using modified folded stepped-impedance resonators," IEEE-MTT-S International Microw. Symp. Dig., 857-860, 2009. Google Scholar

23. Hong, J.-S. and W. Tang, "Dual-band filter based on non-degenerate dual-mode slow-wave open-loop resonators," IEEE-MTT-S International Microw. Symp. Dig., 861-864, 2009. Google Scholar

24. Hong, J. S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, Wiley Inter-Science, New York, 2001.

25. Zhang, X. Y., J.-X. Chen, Q. Xue, and S. M. Li, "Dual-band bandpass filters using stub-loaded resonators," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 8, 583-585, Aug. 2007.
doi:10.1109/LMWC.2007.901768 Google Scholar

26. Mondal, P. and M. K. Mandal, "Design of dual-band passband filters using stub-loaded open-loop resonators," IEEE Trans. on Microwave Theory and Tech., Vol. 56, No. 1, 150-155, Jan. 2008.
doi:10.1109/TMTT.2007.912204 Google Scholar

27. Sagawa, M., M. Makimoto, and S. Yamashita, "Geometrical structures and fundamental characteristics of microwave stepped-impedance resonators," IEEE Trans. on Microwave Theory and Tech., Vol. 45, No. 7, 1078-1085, Jul. 1997.
doi:10.1109/22.598444 Google Scholar

28. Makimoto, M. and S. Yamashita, Microwave Resonators and Filters for Wireless Communications, Springer Series in Advanced Microelectronics, Berlin, 2001.

Dr. Maria Velazquez-Ahumada

Professor Jesus Martel-Villagran

Prof. Francisco Medina

Prof. Francisco Mesa