volume | PIER Journals

Abstract

In this paper, a broadband bandpass filter (BPF) with superior spurious suppression over a wide frequency range at least up to 20 GHz at −20 dB has been designed. The proposed broadband bandpass filter has designed using quarter-wavelength short stubs alternating with branch stubs co-via structure, and inserting the bandstop filters to substitute for redundant connecting lines. Compare with some traditional co-via structure, this work by using the branch stubs to construct the co-via structure, not only reduce the size around 70% but also decrease the radiation loss due to some complex meander configurations occurring in the connecting lines. For the prototype broadband filter, center frequencies around 4 GHz were selected. The bandwidth of passband was between 1.95 GHz and 6.25 GHz, in which the insertion-loss amounts to around −1.5 dB. The suppression range of stopbandis between 8.2-20.3 GHz, in which the insertion-loss amounts to around −20 dB.

1. Wong, S. W. and L. Zhu, "EBG-embedded multiple-mode resonator for UWB bandpass filter with improved upper-stopband performance ," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 6, 421-423, June 2007.
doi:10.1109/LMWC.2007.897788

2. Singh, P. K., S. Basu, and Y. H. Wang, "Planar ultra-wideband bandpass filter using edge coupled microstrip lines and stepped impedance open stub ," IEEE Microw. Wireless Compon. Lett. , Vol. 17, No. 9, 649-651, Sep. 2007.
doi:10.1109/LMWC.2007.903440

3. Zhu, L., S. Sun, and W. Menzel, "Ultra-wideband (UWB) bandpass filters using multiple-mode resonator ," IEEE Microw. Wireless Compon. Lett., Vol. 15, No. 11, 796-798, Nov. 2005.

4. Chen, H. and Y.-X. Zhang, "A novel and compact UWB bandpass filter using microstrip fork-form resonators," Progress In Electromagnetics Research, Vol. 77, 273-280, 2007.
doi:10.2528/PIER07082302

5. Hsieh, L. H. and K. Chang, "Compact, low insertion-loss, sharprejection, and wide-band microstrip bandpass filters ," IEEE Trans. Microw. Theory Tech., Vol. 51, No. 4, 1241-1246, Apr. 2003.
doi:10.1109/TMTT.2003.809643

6. Xiao, J.-K. and Q.-X. Chu, "Novel microstrip triangular resonator bandpass filter with transmission zeros and wide bands using fractal-shapedd efection," Progress In Electromagnetics Research, Vol. 77, 343-356, 2007.
doi:10.2528/PIER07081901

7. Shaman, H. and J. S. Hong, "An optimum ultra-wideband (UWB) bandpass filter with spurious response suppression," Proc. IEEE Conf. Wireless and Microwave Technology Conference, 1-5, Dec. 2006.
doi:10.1109/WAMICON.2006.351902

8. Tang, C. W. and M. G. Chen, "A microstrip ultra-wideband bandpass filter with cascaded broadband bandpass and bandstop filters," IEEE Trans. Microw. Theory Tech., Vol. 55, 2412-2417, Nov. 2007.

9. Yang, G. M., R. Jin, J. Geng, X. Huang, and G. Xiao, "Ultrawideband bandpass filter with hybrid quasi-lumped elements and defected ground structure ," IET Microwaves, Antennas & Propagation , Vol. 1, 733-736, June 2007.
doi:10.1049/iet-map:20060288

10. Shaman, H. N. and J. S. Hong, "A compact ultra-wideband (UWB) bandpass filter with transmission zero," European Microwave Conference, 603-605, Sep. 2006.
doi:10.1109/EUMC.2006.281464

11. Wong, W. T., Y. S. Lin, C. H. Wang, and C. H. Chen, "Highly selective microstrip bandpass filters for ultra-wideband (UWB) applications," Proc. Asia-Pacific Microw. Conf. (APMC), 1-4, Dec. 2005.

12. Zhang, J., B. Cui, S. Lin, and X.-W. Sun, "Sharp-rejection lowpass filter with controllable transmission zero using complementary split ring resonators (CSRRs)," Progress In Electromagnetics Research, Vol. 69, 219-226, 2007.
doi:10.2528/PIER06122103

13. Chen, J., Z.-B.Weng, Y.-C. Jiao, and F.-S. Zhang, "Lowpass filter design of Hilbert curve ring defected ground structure," Progress In Electromagnetics Research, Vol. 70, 269-280, 2007.
doi:10.2528/PIER07012603

14. Moghadasi, S. M., "Compact and wideband 1-D mushroom-like EBG filters," Progress In Electromagnetics Research, Vol. 83, 323-333, 2008.
doi:10.2528/PIER08050101

15. Han, S. H., X. L. Wang, and Y. Fan, "Analysis and design of multiple-bandband stop filters," Progress In Electromagnetics Research, Vol. 70, 297-306, 2007.
doi:10.2528/PIER07020903

16. Hong, J. S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Application, Wiley, 2001.

17. Pozar, D. M., Microwave Engineering, Wiley, 1998.

18. Mattaei, G., L. Young, and E. M. T. Jones, Microwave Filters, Impedance-Matching Networks, and Coupling Structures, Artech House, 1980.

19. IE3D User's Manual, Release 8, Zeland Software, Inc., 2001.

Dr. Wen-Jeng Lin

Dr. Chin-Sheng Chang

Dr. Jian-Yi Li

Prof. Ding-Bing Lin

Dr. Lih-Shan Chen

Dr. Mau-Phon Houng