volume | PIER Journals

Abstract

This paper presents that the extra passband with two transmission zeros can be obtained by adding shunt open stubs to the asymmetric half-wavelength resonators structure. By using this method, a fourth or even higher passband with good selectivity and compact size can be obtained. Dual-band, tri-band and quad-band bandpass filters are demonstrated by using this method. The measured bandwidth is 80/180 MHz for the dual-band, 60/180/180 MHz for the tri-band and 130/360/170/70MHz for the quad-band filter, respectively. The measured insertion loss for the dual-band, tri-band and quad-band filter is less than 2.7 dB, 2.5 dB and 2.9 dB at the center frequency. All the simulated results and the measured results agree well.

1. Chen, C.-Y. and C.-Y. Hsu, "A simple and effective method or microstrip dual-band filters design," IEEE Microw. Wireless Compon. Lett., Vol. 16, No. 5, 246-248, May 2006.
doi:10.1109/LMWC.2006.873584

2. Chen, C.-Y. and C.-Y. Hsu, "A simple and effective method for microstrip dual-band filters design," IEEE Microw. Wireless Compon. Lett., Vol. 16, No. 5, 246-248, May 2006.
doi:10.1109/LMWC.2006.873584

3. Wu, G.-L., W. Mu, X.-W. Dai, and Y.-C. Jiao, "Design of novel dual-band bandpass filter with microstrip meander-loop resonator and CSRR DGS ," Progress In Electromagnetics Research, Vol. 78, 17-24, 2008.
doi:10.2528/PIER07090301

4. Zhao, L.-P., X.-W. Dai, Z.-X. Chen, and C.-H. Liang, "Novel design of dual-mode dual-band bandpass filter with triangular resonators," Progress In Electromagnetics Research, Vol. 77, 417-424, 2007.
doi:10.2528/PIER07090501

5. Chen, C.-Y. and C.-C. Lin, "The design and fabrication of a highly compact microstrip dual-band bandpass filter," Progress In Electromagnetics Research, Vol. 112, 299-307, 2011.

6. Wu, B., C.-H. Liang, Q. Li, and P.-Y. Qin, "Novel dual-band filter incorporating defected SIR and microstrip SIR," IEEE Microw. Wireless Compon. Lett., Vol. 18, No. 6, 392-394, June 2008.
doi:10.1109/LMWC.2008.922614

7. Chiou, Y.-C. and J.-T. Kuo, "Planar multiband bandpass filter with multimode stepped-impedance resonators," Progress In Electromagnetics Research, Vol. 114, 129-144, 2011.

8. Chen, W.-Y., M.-H. Weng, S.-J. Chang, H. Kuan, and Y.-H. Su, "A new tri-band bandpass FIlter for GSM, WiMAX and ultra-wideband responses by using asymmetric stepped impedance resonators," Progress In Electromagnetics Research, Vol. 124, 365-381, 2012.
doi:10.2528/PIER11122010

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

10. Lee, S.-Y. and C.-M. Tsai, "New cross-coupled filter design using improved hairpin resonators," IEEE Trans. Microwave Theory Tech., Vol. 48, No. 12, 2482-2490, February 2000.
doi:10.1109/22.899002

11. Zhang, X. Y., C. H. Chan, Q. Xue, and B.-J. Hu, "Dual-band bandpass filter with controllable bandwidths using two coupling paths," IEEE Microw. Wireless Compon. Lett., Vol. 20, No. 11, 616-618, June 2010.
doi:10.1109/LMWC.2010.2066553

12. Zhu, Y.-Z. and Y.-J. Xie, "Novel microstrip bandpass filters with transmission zeros," Progress In Electromagnetics Research, Vol. 77, 29-41, 2007.
doi:10.2528/PIER07072301

13. Kuo, J.-T. and S.-W. Lai, "New dual-band bandpass filter with wide upper rejection band," Progress In Electromagnetics Research, Vol. 123, 371-384, 2012.
doi:10.2528/PIER11112304

14. Doan, M. T., W. Che, K. Deng, and W. Feng, "Compact tri-band bandpass filter using stub-loaded resonator and quarter-wavelength resonator," 2011 China-Japan Joint Microwave Conference Proceedings (CJMW), 1-4, April 2011.

15. 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, June 2007.
doi:10.1109/LMWC.2007.901768

16. Zhang, X. Y., Q. Xue, and B. J. Hu, "Planar tri-band bandpass filter with compact size," IEEE Microw. Wireless Compon. Lett., Vol. 20, No. 5, 262-264, June 2010.
doi:10.1109/LMWC.2010.2045583

17. Chu, Q.-X., F.-C. Chen, Z.-H. Tu, and H. Wang, "A novel crossed resonator and its applications to bandpass filters," IEEE Trans. Microwave Theory Tech., Vol. 57, No. 7, 1753-1759, July 2009.

18. Yang, C.-F., Y.-C. Chen, C.-Y. Kung, J.-J. Lin, and T.-P. Sun, "Design and fabrication of a compact quad-band bandpass filter using two different parallel positioned resonators," Progress In Electromagnetics Research, Vol. 115, 159-172, 2011.

19. Kwok, R. S. and J. F. Liang, "Characterization of high-Q resonators for microwave-filter applications," IEEE Trans. Microwave Theory Tech., Vol. 47, No. 1, 111-114, January 1999.
doi:10.1109/22.740093

20. Gupta, K. C., R. Garg, I. Bahl, and P. Bhartia, Microstrip Lines and Slotlines, 2nd Ed., Artech House, Boston, MA, 1996.

21. Zhang, J., J.-Z. Gu, B. Cui, and X.-W. Sun, "Compact and harmonic suppression open-loop resonator bandpass filter with tri-section SIR," Progress In Electromagnetics Research, Vol. 69, 93-100, 2007.
doi:10.2528/PIER06120702

22. Wu, H.-W., S.-K. Liu, M.-H. Weng, and C.-H. Hung, "Compact microstrip bandpass filter with multispurious suppression," Progress In Electromagnetics Research, Vol. 107, 21-30, 2010.
doi:10.2528/PIER10061601

Professor Xiuping Li

Dr. Huisheng Wang