volume | PIER Journals

Abstract

A novel high-selectivity bandpass filter based on a defected ground structure and substrate integrated coaxial line is proposed. Three transmission zeros near the passband are achieved by introducing a divergent-shaped resonator and two spindle-shaped defected ground structures, resulting in a high selectivity. To verify the proposed structure, one prototype with a center frequency of 4.94 GHz is designed and fabricated. The measured results show that three transmission zeros respectively located at 3.92, 4.36, and 6.00 GHz are obtained. The 3-dB passband bandwidth is 14.2% from 4.59 to 5.29 GHz. The upper stopband rejection is better than 20 dB from 5.71 to 11.31 GHz.

1. Gatti, F., M. Bozzi, L. Perregrini, K. Wu, and R. G. Bosisio, "A novel substrate integrated coaxial line (SICL) for wide-band applications," Eur. Microwave Conf., 1614-1617, Manchester, 2006.
doi:10.1109/EUMC.2006.281409 Google Scholar

2. Chu, P., W. Hong, K.Wu, J. Chen, and H. Tang, "A miniaturized bandpass filter implemented with substrate integrated coaxial line," Microw. Opt. Techn. Lett., Vol. 55, No. 1, 131-133, Jan. 2013.
doi:10.1002/mop.27249 Google Scholar

3. Lu, Y.-L., G.-L. Dai, C. Hua, G. Xu, and K. Li, "Design of miniaturized substrate integrated coaxial line bandpass filters with quarter-wavelength spiral resonator," Int. J. RF Microwave Comput. Aided Eng., Vol. 26, No. 6, 489-495, Jun. 2016.
doi:10.1002/mmce.20994 Google Scholar

4. Chu, P., W. Hong, L. Dai, H. Tang, Z. Hao, J. Chen, and K. Wu, "Wide stopband bandpass filter implemented with spur stepped impedance resonator and substrate integrated coaxial line technology," IEEE Microw. Wireless Compon. Lett., Vol. 24, No. 4, 218-220, Apr. 2014.
doi:10.1109/LMWC.2013.2295219 Google Scholar

5. Chu, P., L. Guo, L. Zhang, and K. Wu, "Wide stopband bandpass filter implemented by stepped impedance resonator and multiple in-resonator open stubs," IEEE Access, Vol. 7, 140631-140636, Sept. 2019.
doi:10.1109/ACCESS.2019.2943605 Google Scholar

6. Sanchez-Soriano, M. A., S. Sirci, J. D. Martinez, and V. E. Boria, "Compact dual-mode substrate integrated waveguide coaxial cavity for bandpass filter design," IEEE Microw. Wireless Compon. Lett., Vol. 26, No. 6, 386-388, Jun. 2016.
doi:10.1109/LMWC.2016.2558651 Google Scholar

7. He, Z., C. J. You, S. Leng, and X. Li, "Compact inline substrate integrated waveguide filter with enhanced selectivity using new non-resonating node," Electron. Lett., Vol. 52, No. 21, 1778-1780, Oct. 201.
doi:10.1049/el.2016.2712 Google Scholar

8. Lu, Y., Y.Wang, T. Liu, B. Yu, and K. Li, "Miniaturized substrate-integrated coaxial line bandpass filter with improved upper stopband," Int. J. Microw. Wirel. Technol., Vol. 9, No. 7, 1441-1445, Sept. 2017.
doi:10.1017/S1759078716001422 Google Scholar

9. Woo, D.-J., T.-K. Lee, J.-W. Lee, C.-S. Pyo, and W.-K. Choi, "Novel U-slot and V-slot DGSs for bandstop filter with improved Q factor," IEEE Trans. Microw. Theory Techn., Vol. 54, No. 6, 2840-2847, Jun. 2006.
doi:10.1109/TMTT.2006.875450 Google Scholar

10. Zhang, Y. L., W. Hong, K. Wu, J. X. Chen, and H. J. Tang, "Novel substrate integrated waveguide cavity filter with defected ground structure," IEEE Trans. Microw. Theory Techn., Vol. 53, No. 4, 1280-1287, Apr. 2005.
doi:10.1109/TMTT.2005.845750 Google Scholar

11. Azizi, S., M. E. Gharbi, S. Ahyoud, and A. Asselman, "Design of bandpass filter for C application with improved selectivity," Mediterr. Congr. Telecommun, 1-4, Fez, Morocco, 2019. Google Scholar

12. Wen, Z.-L., Y.-N Han, X.-Y. Sun, et al. "Design of miniaturized low-pass filter with improved Koch fractal DGS," IEEE Int. Symp. Electromagn. Compat., 1-4, Beijing, China, 2017. Google Scholar

13. Shi, S., W. Choi, W. Che, K. Tam, and Q. Xue, "Ultra-wideband differential bandpass filter with narrow notched band and improved common-mode suppression by DGS," IEEE Microw. Wireless Compon. Lett., Vol. 22, No. 4, 185-187, Apr. 2012.
doi:10.1109/LMWC.2012.2187885 Google Scholar

14. Hao, Z.-C., W. Hong, J.-X. Chen, X.-P. Chen, and K.Wu, "Compact super-wide bandpass substrate integrated waveguide (SIW) filters," IEEE Trans. Microw. Theory Techn., Vol. 53, No. 9, 2968-2977, Sept. 2005.
doi:10.1109/TMTT.2005.854232 Google Scholar

Dr. Zhongbao Wang

Dr. Jian Ma

Dr. Shipeng Zhao

Professor Hongmei Liu

Prof. Shao-Jun Fang