volume | PIER Journals

Abstract

A high-selectivity microstrip wideband bandpass filter with six transmission zeros using transversal signal-interaction concepts is proposed. A fifth-order wide passband with six transmission zeros (0-2f₀, f₀ is center frequency of the passband) can be realized two transmission paths. The bandwidth and locations of the transmission zeros can be adjusted conveniently by changing the characteristic impedances of open stub and coupling coefficients of the open/shorted coupled lines. A prototype of planar wideband bandpass filter with 3 -dB fractional bandwidth 43.3% (2.33-3.63 GHz) is designed and fabricated. The measured and simulated results both indicate good performances of high selectivity and wideband harmonic suppression.

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

2. Xiao, J.-K. and Y. Li, "Novel compact microstrip square ring bandpass filter," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 13, 1817-1826, 2006.
doi:10.1163/156939306779292156 Google Scholar

3. Kharakhili, F. G., M. Fardis, G. Dadashzadeh, and A. Ahmadi, "Circular slot with a novel circular microstrip open ended microstrip feed for UWB applications," Progress In Electromagnetics Research, Vol. 68, 161-167, 2007.
doi:10.2528/PIER06071901 Google Scholar

4. Chu, H. and X. Q. Shi, "Compact ultra-wideband bandpass filter based on SIW and DGS technology with a notch band," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 4, 589-596, 2011.
doi:10.1163/156939311794500304 Google Scholar

5. Lai, X., Q. Li, P. Y. Qin, B. Wu, and C. H. Liang, "A novel wideband bandpass filter based on complementary split-ring resonator," Progress In Electromagnetics Research C, Vol. 1, 177-184, 2008.
doi:10.2528/PIERC08013104 Google Scholar

6. Razalli, M. S., A. Ismail, M. A. Mahdi, and M. N. Hamidon, "Novel compact microstrip ultra-wideband filter utilizing short-circuited stubs with less vias," Progress In Electromagnetics Research, Vol. 88, 91-104, 2008.
doi:10.2528/PIER08102303 Google Scholar

7. Wei, F., L. Chen, X.-W. Shi, X. H. Wang, and Q. Huang, "Compact UWB bandpass filter with notched band," Progress In Electromagnetics Research C, Vol. 4, 121-128, 2008. Google Scholar

8. Wu, Y., Y. Liu, S. Li, and C. Yu, "A simple microstrip bandpass filter with analytical design theory and sharp shirt selectivity," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 8-9, 1253-1263, 2011.
doi:10.1163/156939311795762060 Google Scholar

9. Gao, S. S., S. Q. Xiao, J. P. Wang, X.-S. Yang, Y. X. Wang, and B. Z. Wang, "A compact UWB bandpass filter with wide stopband," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 8-9, 1043-1049, 2008.
doi:10.1163/156939308784158661 Google Scholar

10. Lin, W. J., C. S. Chang, J. Y. Li, D. B. Lin, L. S. Chen, and M. P. Houng, "Improved compact broadband bandpass filter using branch stubs co-via structure with wide stopband characteristic," Progress In Electromagnetics Research C, Vol. 5, 45-55, 2008. Google Scholar

11. Shobeyri, M. and M. H. Vadjed-Samiei, "Compact ultra-wideband bandpass filter with defected ground structure," Progress In Electromagnetics Research Letters, Vol. 4, 25-31, 2008.
doi:10.2528/PIERL08050205 Google Scholar

12. Feng, W. J. and W. Q. Che, "Novel wideband differential bandpass filter based on T-shaped structure," IEEE Trans. Microw. Theory Tech., Vol. 6, No. 60, 1560-1568, 2012.
doi:10.1109/TMTT.2012.2188538 Google Scholar

13. Lin, W. J., J. Y. Li, D. B. Lin, L. S. Chen, and M. P. Houng, "Miniaturized wideband ring-type bandpass filters with upper stopband characteristic ," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 7, 931-939, 2010.
doi:10.1163/156939310791285191 Google Scholar

14. Gao, M. J., L. S. Wu, and J. F. Mao, "Compact notched ultra-wideband bandpass filter with improved out-of-band performance using quasielectromagnetic bandstop structure," Progress In Electromagnetics Research Letters, Vol. 125, 137-150, 2012. Google Scholar

15. Gómez-García, R., J. I. Alonso, and D. Amor-Martn, "Using the branchline directional coupler in the design of microwave bandpass filters," IEEE Trans. Microw. Theory Tech., Vol. 10, No. 53, 3221-3229, 2005.
doi:10.1109/TMTT.2005.855140 Google Scholar

16. Gómez-García, R. and J. I. Alonso, "Design of sharp-rejection and low-loss wide-band planar filters using signal-interference techniques," IEEE Microw. Wireless Compon. Lett., Vol. 8, No. 15, 530-5327, 2005.
doi:10.1109/LMWC.2005.852797 Google Scholar

17. Sun, S., L. Zhu, and H. H. Tian, "A compact wideband bandpass filter using transversal resonator and asymmetrical interdigital coupled lines," IEEE Microw. Wireless Compon. Lett., Vol. 3, No. 18, 173-1755, 2008. Google Scholar

18. Wong, K. W., L. Chiu, and Q. Xue, "Wideband parallel-strip bandpass filter using phase inverter," IEEE Microw. Wireless Compon. Lett., Vol. 8, No. 18, 503-505, 2008.
doi:10.1109/LMWC.2008.2001001 Google Scholar

19. Feng, W. J. and W. Q. Che, "Novel ultra-wideband bandpass filter using shorted coupled lines and transversal transmission line," IEEE Microw. Wireless Compon. Lett., Vol. 10, No. 20, 548-551, 2010.
doi:10.1109/LMWC.2010.2055840 Google Scholar

20. Sánchez-Soriano, M. A., E. Bronchalo, and G. Torregrosa-Penalva, "Compact UWB bandpass filter based on signal interference techniques," IEEE Microw. Wireless Compon. Lett., Vol. 11, No. 19, 692-694, 2009.
doi:10.1109/LMWC.2009.2032001 Google Scholar

21. Feng, W. J., W. Q. Che, and T. F. Eibert, "Ultra-wideband bandpass filter based on transversal signal-interaction concepts," Electron. Lett., Vol. 24, No. 47, 1330-1331, 2011.
doi:10.1049/el.2011.2658 Google Scholar

22. Zhu, H. T., W. J. Feng, W. Q. Che, and Q. Xue, "Ultra-wideband differential bandpass filter based on transversal signal-interference concept," Electron. Lett., Vol. 18, No. 47, 1033-1034, 2011.
doi:10.1049/el.2011.2088 Google Scholar

23. Feng, W. J., W. Q. Che, T. F. Eibert, and Q. Xue, "Compact differential ultra-wideband bandpass filter based on the double-sided parallel-strip line and transversal signal-interaction concepts," IET Microwaves, Antennas and Propagation, Vol. 2, No. 6, 186-195, 2012.
doi:10.1049/iet-map.2011.0400 Google Scholar

24. Matheai, G. L., L. Young, and E. M. T. Jones, Microwave Filters, Impedance-matching Networks, and Coupling Structures, Artech House, Dedham, 1980.

Dr. Shujian Xue

Dr. Wenjie Feng

Dr. Haotian Zhu

Prof. Wenquan Che