volume | PIER Journals

Abstract

A novel compact dual-band bandpass filter using spiral resonators and input/output (source-load) direct coupling structure has been presented. Two different transmission paths are utilized to realize independently controllable central frequencies and bandwidths for each passband. In addition, three transmission zeros has been introduced to improve the frequency selectivity. A dual-passband filter centered at 2.41 GHz and 4.22 GHz is designed, simulated, and fabricated to demonstrate the performance of the proposed filter structure. The measured results show good agreement with the simulated ones.

1. Kuo, J.-T., C.-Y. Fan, and S.-C. Tang, "Dual-wideband bandpass filters with extended stopband based on coupled-line and coupled three-line resonators," Progress In Electromagnetics Research, Vol. 124, 1-15, 2012.
doi:10.2528/PIER11120103 Google Scholar

2. Yang, R.-Y., C.-M. Hsiung, C.-Y. Hung, and C.-C. Lin, "A high performance bandpass filter with a wide and deep stopband by using square stepped impedance resonators," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 11-12, 1673-1683, 2010.
doi:10.1163/156939310792149722 Google Scholar

3. Ma, L., K. Song, C. ZhuGe, and Y. Fan, "Compact bandpass filter with wide upper-stopband based on spiral-shaped resonators and spur-lines," Progress In Electromagnetics Research Letters, Vol. 29, 87-95, 2012.
doi:10.2528/PIERL11120203 Google Scholar

4. Chen, H., Y.-H. Wu, Y.-M. Yang, and Y.-X. Zhang, "A novel and compact bandstop filter with folded microstrip/CPW hybrid structure," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 1, 103-112, 2010.
doi:10.1163/156939310790322163 Google Scholar

5. Fallahzadeh, S., H. Bahrami, and M. Tayarania, "Very compact bandstop waveguide filters using split-ring resonators and perturbed quarter-wave transformers," Journal of Electromagnetic Waves and Applications, Vol. 30, No. 5, 482-490, 2010. Google Scholar

6. Xiao, J.-K. and X.-P. Zu, "Multi-mode bandstop filter using defected equilateral triangular patch resonator," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 4, 507-518, 2011.
doi:10.1163/156939311794500340 Google Scholar

7. Abu-Hudrouss, A. M. and M. J. Lancaster, "Design of multiple-band microwave filters using cascaded filters using cascaded filter elements," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 16, 2109-2118, 2009.
doi:10.1163/156939309790109225 Google Scholar

8. Weng, M. H., C. H. Kao, and Y. C. Chang, "A compact dual-band bandpass filter with high band selectivity using cross-coupled asymmetric SIRs for WLANs," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 2-3, 161-168, 2010.
doi:10.1163/156939310790735679 Google Scholar

9. Weng, M.-H., S.-K. Liu, H.-W. Wu, and C.-H. Hung, "A dual-band bandpass filter having wide and narrow bands simultaneously using multilayered stepped impedance resonators," Progress In Electromagnetic Research Letters, Vol. 13, 139-147, 2010.
doi:10.2528/PIERL10022401 Google Scholar

10. Velazquez-Ahumada, M. D. C., J. Martel-Villagr, F. Medina, and F. Mesa, "Application of stub loaded folded stepped impedance resonators to dual band filter design," Progress In Electromagnetic Research, Vol. 102, 107-124, 2010.
doi:10.2528/PIER10011406 Google Scholar

11. Ma, D., Z. Y. Xiao, L. Xiang, X. Wu, C. Huang, and X. Kou, "Compact dual-band bandpass filter using folded SIR with two stubs for WLAN," Progress In Electromagnetic Research, Vol. 117, 357-364, 2011. Google Scholar

12. Miyake, H., S. Kitazawa, T. Ishizaki, T. Yamada, and Y. Nagatom, "A miniaturized monolithic dual band filter using ceramic lamination technique for dual mode portable telephones," IEEE MTT-S Int. Microw. Symp. Dig., 789-792, 1997. Google Scholar

13. Zhang, X. Y., J.-X. Chen, J. Shi, and Q. Xue, "Dual-band bandpass filter design using a novel feed scheme," IEEE Microwave and Wireless Components Letters, Vol. 19, No. 6, 350-352, 2009.
doi:10.1109/LMWC.2009.2020009 Google Scholar

14. Chen, F.-C. and Q.-X. Chu, "Design of dual-band CT filter with sourceload coupling," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 1, 15-22, 2011.
doi:10.1163/156939311793898332 Google Scholar

15. Chen, F. and Q.-X. Chu, "A compact dual-band bandpass filter using meandering stepped impedance resonators," IEEE Microwave and Wireless Components Letters, Vol. 18, No. 5, 320-322, 2008.
doi:10.1109/LMWC.2008.922124 Google Scholar

16. Chen, C.-F., T.-Y. Huang, and R.-B. Wu, "Design of dual-and triple-passband filters using alternately cascaded multiband resonators," IEEE Transactions on Microwave Theory and Techniques, Vol. 54, No. 9, 3550-3558, 2006.
doi:10.1109/TMTT.2006.880653 Google Scholar

17. Deng, H.-W., Y.-J. Zhao, X.-S. Zhang, W. Chen, and J.-K. Wang, "Compact and high selectivity dual-band dual-mode microstrip BPF with single stepped-impedance resonator," Electron. Lett., Vol. 47, No. 5, 326-327, 2011.
doi:10.1049/el.2011.0054 Google Scholar

18. Wei, S. C. and Y. C. Chi, "Analytical design of microstrip short-circuit terminated stepped-impedance resonator dual-band filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 59, No. 7, 1730-1739, 2011.
doi:10.1109/TMTT.2011.2132140 Google Scholar

19. Shi, J. and Q. Xue, "Novel balanced dual-band bandpass filter using coupled stepped-impedance resonators," IEEE Microwave and Wireless Components Letters, Vol. 20, No. 1, 19-21, 2010.
doi:10.1109/LMWC.2009.2035954 Google Scholar

20. Lin, T.-W., U.-H. Lok, and J.-T. Kou, "New dual-mode dual-band bandpass filter with quasi-elliptic function passbands and controllable bandwidths," IEEE MTT-S Int. Microw. Symp. Dig., 576-579, 2010. Google Scholar

21. Wu, X.-H., Q.-X. Chu, and L. Fan, "Compact dual-band bandpass filter with controllable bandwidths," Proc. Int. Conf. Microwave and Millimeter Wave Technology, 1305-1307, 2010.
doi:10.1109/ICMMT.2010.5524807 Google Scholar

22. Lin, H. J., X. W. Shi, X. Q. Chen, X. H. Wang, and Y. F. Bai, "Dual passband filter using hybrid microstrip split ring resonators and coplanar waveguide quarter wavelength resonators," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 1, 39-48, 2011.
doi:10.1163/156939311793898378 Google Scholar

23. Shaman, H. and J. S. Hong, "Asymmetric parallel-coupled lines for notch implementation in UWB filters," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 3, 516-518, Jul. 2007. Google Scholar

24. Song, K. and Q. Xue, "Novel broadband bandpass filters using Y-shaped dual-mode microstrip resonators," IEEE Microwave and Wireless Components Letters, Vol. 19, No. 9, 548-550, 2009.
doi:10.1109/LMWC.2009.2027058 Google Scholar

25. Shaman, H. and J.-S. Hong, "Input and output cross-coupled wideband bandpass filter," IEEE Transactions on Microwave Theory and Techniques, Vol. 55, No. 12, 2562-2568, 2007.
doi:10.1109/TMTT.2007.910066 Google Scholar

26. Ma, K.-X., J.-G. Ma, M. A. Do, and K. S. Yeo, "Compact two-order bandpass filter with three finite zero points," Electron. Lett., Vol. 41, No. 15, 846-848, 2005.
doi:10.1049/el:20051706 Google Scholar

27. Jianxin, C., Y. Mengxia, X. Jun, and X. Quan, "Compact microstrip bandpass filter with two transmission zeros," Electron. Lett., Vol. 40, No. 5, 311-313, 2004.
doi:10.1049/el:20040129 Google Scholar

Dr. Kaijun Song

Dr. Yuxia Mo

Dr. Yunqiang Xia

Dr. Shunyong Hu

Prof. Yong Fan