volume | PIER Journals

Abstract

A high-selective wideband bandpass filter (BPF) with a notched-band and harmonic suppression is proposed in this paper. Firstly, a uniform impedance resonator with an embedded open-circuited stub square loop is applied in the filter design. By adopting parallel-coupling structure at I/O ports, such a resonator can generate a notched-band within the passband due to the counter-phase cancellation of two dissimilar signal paths. The width of the square loop can be adjusted to select the location of the notched-band. Secondly, by introducing an L-shaped open-circuited stub to one input feed line, a transmission zero (TZ) is created. It can be used to suppress higher harmonic passband. The filter is designed and fabricated with the notched-band centered at 8.1 GHz, and two TZs are implemented at the both sides of the passband. Simulated and measured results show that the filter has a good selectivity and a wider stopband characteristic.

1. Yang, G. M., R. Jin, J. Geng, X. Huang, and G. Xiao, "Ultra-wideband bandpass filter with hybrid quasi-lumped elements and defected ground structure," IET Microw. Antennas Propag., Vol. 1, No. 3, 733-736, 2007.
doi:10.1049/iet-map:20060288

2. Basit, A., M. I. Khattak, and M. Al-Hasan, "Design and analysis of a microstrip planar UWB bandpass filter with triple notch bands for WiMAX, WLAN, and X-band satellite communication systems," Progress In Electromagnetics Research M, Vol. 93, 155-164, 2020.
doi:10.2528/PIERM20042602

3. Zhu, L., S. Sun, and W. Menzel, "Ultra-wideband (UWB) bandpass filters using multiple-mode resonator," IEEE Microwave and Wireless Components Letters, Vol. 15, No. 11, 796-798, 2005.
doi:10.1109/LMWC.2005.859011

4. Zhang, S. and L. Zhu, "Compact and high-selectivity microstrip bandpass filters using triple-/quad- mode stub-loaded resonators," IEEE Microwave and Wireless Components Letters, Vol. 21, No. 10, 522-524, 2011.
doi:10.1109/LMWC.2011.2166252

5. Zhu, L., W. Menzel, and , "Compact microstrip bandpass filter with two transmission zeros using a stub-tapped half-wavelength line resonator," IEEE Microwave and Wireless Components Letters, Vol. 13, No. 1, 16-18, 2003.
doi:10.1109/LMWC.2007.911975

6. Ghazali, A. N. and S. Pal, "A compact UWB filter with notched band and suppressed stopband using DGS," IETE Journal of Research, Vol. 59, No. 4, 420-423, 2013.
doi:10.4103/0377-2063.118065

7. Sengupta, A., S. Roychoudhury, and S. Das, "Design of a miniaturized multilayer tunable super wideband BPF," Progress In Electromagnetics Research C, Vol. 99, 145-156, 2020.
doi:10.2528/PIERC19112805

8. Chen, J. X., Y. L. Li, W. Qin, Y. J. Yang, and Z. H. Bao, "Compact multi-layer bandpass filter with wide stopband using selective feeding scheme," IEEE Trans. Circuits Syst. II, Vol. 65, 1009-1013, 2017.

9. Aliqab, K. and J. Hong, "UWB balanced BPF using a low-cost LCP bonded multilayer PCB technology," IEEE Trans. Microw. Theory Tech., Vol. 67, No. 3, 1023-1029, 2019.
doi:10.1109/TMTT.2019.2892774

10. Mouavi, O., A. R. Eskandari, M. M. R. Kashani, and M. A. Shameli, "Compact UWB bandpass filter with two notched bands using SISLR and DMS structure," Progress In Electromagnetics Research M, Vol. 80, 193-201, 2019.
doi:10.2528/PIERM19021303

11. Liu, F. and M. Qun, "A new compact UWB bandpass filter with quad notched characteristics," Progress In Electromagnetics Research Letters, Vol. 88, 83-88, 2020.
doi:10.2528/PIERL19090505

12. Yang, L., W. W. Choi, K. W. Tam, and L. Zhu, "Novel wideband bandpass filter with dual notched bands using stub-loaded resonators," IEEE Microwave and Wireless Components Letters, Vol. 27, 25-27, 2017.
doi:10.1109/LMWC.2016.2629967

13. Guo, X., Y. Xu, and W. Wang, "Miniaturized planar ultra-wideband bandpass filter with notched band," Journal of Computer and Communications, Vol. 3, No. 3, 100-105, 2015.
doi:10.4236/jcc.2015.33017

14. Wang, C.-H., Y.-S. Lin, and C. H. Chen, "Novel inductance-incorporated microstrip coupled-line bandpass filters with two attenuation poles," IEEE MTT-S Int. Microwave Symp. Dig., 1979-1982, 2004.

15. Shbman, H. and J.-S. Hong, "Asymmetric parallel-coupled lines for notch implementation in UWB filters," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 7, 516-518, 2007.
doi:10.1109/LMWC.2007.899314

Dr. Jie Liu

Professor Yun Xiu Wang

Dr. Guangyong Wei

Dr. Rui Lin Jia

Dr. Yin Long Duan