volume | PIER Journals

Abstract

In this letter, a novel ultra-wideband (UWB) bandpass filter (BPF) configuration with a quad-mode resonator (QMR) structure is proposed, which hasa highly selective and compact performance. The QMR is composed of a funnel-shaped resonator loaded in the middle and a low-impedance folded microstrip line. Initially, the resonant frequencies are uniformly distributed in the UWB passband by varying the length of QMR physical stubs, and later the three-line parallel coupled lines are employed to enhance coupling to obtain a flat passband. The feedlines are then loaded with a pair of λ/2 stepped impedance radial stubs (SIRSs) to provide excellent band-stop characteristics. Finally, a filter prototype is created, and its performance is evaluated using the generated data. The proposed UWB filter has sharp roll-off ratio of 99 and 63 dB/GHz, respectively, at the lower and upper edges of the passband.

1. FCC "Revision of part 15 of the commission's rules regarding ultra-wideband transmission system," ET-Docket, 98153, Washington, 2002.

2. 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, 2005.
doi:10.1109/LMWC.2005.859011

3. Li, R. and L. Zhu, "Compact UWB bandpass filter using stub-loaded multiple-mode resonator," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 1, 40-42, 2007.
doi:10.1109/LMWC.2006.887251

4. Wong, S. W. and L. Zhu, "Quadruple-mode UWB bandpass filter with improved out-of-band rejection," IEEE Microw. Wireless Compon. Lett., Vol. 19, No. 3, 152-154, 2009.
doi:10.1109/LMWC.2009.2013735

5. Honarvar, M. A. and R. A. Sadeghzadeh, "Design of coplanar waveguide ultrawideband bandpass filter using stub-loaded resonator with notched band," Microwave and Optical Technology Letters, Vol. 54, No. 9, 2056-2061, 2012.
doi:10.1002/mop.26992

6. Jhariya, D. K., A. Mohan, and M. Sinha, "Design of two-stage fish spear-shaped UWB bandpass filter with sharp selectivity and good out of band performances," Int. J. Microw. Wireless Technol., Vol. 9, No. 9, 1821-1826, 2017.
doi:10.1017/S1759078717000794

7. Zhou, C., P. Guo, K. Zhou, and W. Wu, "Design of a compact UWB filter with high selectivity and superwide stopband," IEEE Microw. Compon. Lett., Vol. 27, No. 7, 636-638, 2017.
doi:10.1109/LMWC.2017.2711509

8. Wong, S. B. and L. Zhu, "EBG-embedded multiple-mode resonator for UWB bandpass filter with improved upper-stopband performance," IEEE Microw. Compon. Lett., Vol. 17, No. 16, 421-423, 2007.
doi:10.1109/LMWC.2007.897788

9. Baik, J., S. Han, C. Jeong, J. Jeong, and Y. Kim, "Compact ultra-wideband bandpass filter with EBG structure," IEEE Microw. Compon. Lett., Vol. 18, No. 10, 671-673, 2008.
doi:10.1109/LMWC.2008.2003456

10. Deng, X., K. D. Xu, Z. Wang, and B. Yan, "Novel microstrip ultra-wideband bandpass filter using radial-stub-loaded structure," ACES Journal, Vol. 32, No. 12, 1148-1151, 2017.

11. Abbosh, A., M. Bialkowski, and S. Ibrahim, "Ultra-wideband bandpass filters using broadside-coupled microstrip-coplanar waveguide," IET Microwaves, Antennas & Propagation, Vol. 5, No. 7, 764-770, 2011.
doi:10.1049/iet-map.2010.0379

12. Ghazali, A. N., M. Sazid, and S. Pal, "A miniaturized low-cost microstrip-to-coplanar waveguide transition-based ultra-wideband bandpass filter with multiple transmission zeros," Microwave Opt. Technol. Lett., Vol. 62, No. 12, 3662-3667, 2020.
doi:10.1002/mop.32482

13. Ghazali, A. N., M. Sazid, and B. Virdee, "A compact UWB-BPF based onmicrostrip-to-CPW transition with multiple transmission zeros," Microwave Opt. Technol. Lett., Vol. 6, No. 8, 1925-1928, 2018.
doi:10.1002/mop.31274

14. Yao, B. Y., Y. G. Zhou, and Q. S. Cao, "Compact UWB bandpass filter using ring open stub loaded multiple-mode resonator," Electronics Letters, Vol. 45, No. 11, 554-556, 2009.
doi:10.1049/el.2009.1043

15. Jung, M. and B.-W. Min, "A highly selective UWB bandpass filter using stepped impedance stubs," International Journal of Microwave and Wireless Technologies, Vol. 10, No. 3, 301-307, 2018.
doi:10.1017/S175907871800020X

Dr. Guangyong Wei

Professor Yun Xiu Wang

Dr. Jie Liu

Dr. Yang Gao

Dr. Xiao Tao Yao